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September 14, 2011

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Application of Electro-Spark Deposition for the Joining of Dissimilar Metals. September 14, 2011. Jerry E. Gould Technology Leader, Resistance and Solid-State Welding Email: [email protected] Phone: 614.688.5121. Topics to be Addressed. Functionality of the electro-spark deposition process - PowerPoint PPT Presentation
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September 14, 2011 Application of Electro-Spark Deposition for the Joining of Dissimilar Metals Jerry E. Gould Technology Leader, Resistance and Solid-State Welding Email: [email protected] Phone: 614.688.5121
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  • September 14, 2011Application of Electro-Spark Deposition for the Joining of Dissimilar MetalsJerry E. GouldTechnology Leader, Resistance and Solid-State WeldingEmail: [email protected]: 614.688.5121

  • Topics to be AddressedFunctionality of the electro-spark deposition processApplication for joints between Ni-based superalloys and refractory metalsObserved microstructuresResulting mechanical propertiesInterpretation of effective cooling ratesImplications for dissimilar joint metallurgy

  • Electro-Spark Deposition (ESD) ProcessESD processing characteristicsRepeat fire capacitive discharge power supplyDischarge pulse widths on the order of 35 sPeak currents on the order of 100s of ampsESD torchHand heldRotating electrodeShort circuit sparkingTransfer of small metal volumes (microns in diameter) to substrate

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    -0.0005250263

    -0.0005250263

    -0.0005250263

    -0.0005250263

    -0.0005250263

    -0.0005250263

    -0.0005250263

    -0.0005250263

    3.4996499825

    -0.0005250263

    -0.0005250263

    -0.0005250263

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    3.4996499825

    -0.0005250263

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    -0.0005250263

    -0.0005250263

    -0.0005250263

    -0.0005250263

    -0.0005250263

    -0.0005250263

    -0.0005250263

    -0.0005250263

    3.4996499825

    -0.0005250263

    -0.0005250263

    -0.0005250263

    -0.0005250263

    -0.0005250263

    -0.0005250263

    -0.0005250263

    -0.0005250263

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    -0.0005250263

    -0.0005250263

    -0.0005250263

    -0.0005250263

    -0.0005250263

    -0.0005250263

    -0.0005250263

    -0.0005250263

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    -0.0005250263

    -0.0005250263

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    -0.0005250263

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    -0.0005250263

    -0.0005250263

    -0.0005250263

    -0.0005250263

    -0.0005250263

    -0.0005250263

    ASAP, no diode

    Time (micro-seconds)

    Current (A)

    Sheet1

    ASAP, no diode

    time (microsec)Current (A)

    0-0.0005250263

    0.1953125-0.0005250263

    0.390625-0.0005250263

    0.5859375-0.0005250263

    0.78125-0.0005250263

    0.9765625-0.0005250263

    1.171875-0.0005250263

    1.3671875-0.0005250263

    1.5625-0.0005250263

    1.7578125-0.0005250263

    1.953125-0.0005250263

    2.1484375-0.0005250263

    2.34375-0.0005250263

    2.5390625-0.0005250263

    2.734375-0.0005250263

    2.9296875-0.0005250263

    3.125-0.0005250263

    3.3203125-0.0005250263

    3.515625-0.0005250263

    3.7109375-0.0005250263

    3.90625-0.0005250263

    4.1015625-0.0005250263

    4.296875-0.0005250263

    4.4921875-0.0005250263

    4.6875-0.0005250263

    4.8828125-0.0005250263

    5.078125-0.0005250263

    5.2734375-0.0005250263

    5.46875-0.0005250263

    5.6640625-0.0005250263

    5.859375-0.0005250263

    6.0546875-0.0005250263

    6.253.4996499825

    6.4453125-0.0005250263

    6.640625-0.0005250263

    6.8359375-0.0005250263

    7.03125-0.0005250263

    7.2265625-0.0005250263

    7.421875-0.0005250263

    7.6171875-0.0005250263

    7.8125-0.0005250263

    8.0078125-0.0005250263

    8.203125-0.0005250263

    8.3984375-0.0005250263

    8.59375-0.0005250263

    8.7890625-0.0005250263

    8.984375-0.0005250263

    9.1796875-0.0005250263

    9.375-0.0005250263

    9.5703125-0.0005250263

    9.765625-0.0005250263

    9.9609375-0.0005250263

    10.15625-0.0005250263

    10.3515625-0.0005250263

    10.546875-0.0005250263

    10.7421875-0.0005250263

    10.9375-0.0005250263

    11.1328125-0.0005250263

    11.328125-0.0005250263

    11.5234375-0.0005250263

    11.71875-0.0005250263

    11.9140625-0.0005250263

    12.109375-0.0005250263

    12.3046875-0.0005250263

    12.5-0.0005250263

    12.6953125-0.0005250263

    12.890625-0.0005250263

    13.0859375-0.0005250263

    13.28125-0.0005250263

    13.4765625-0.0005250263

    13.671875-0.0005250263

    13.8671875-0.0005250263

    14.0625-0.0005250263

    14.25781253.4996499825

    14.4531256.9998249912

    14.648437510.5

    14.8437514.0001750088

    15.039062517.5003500175

    15.23437521.0005250263

    15.429687524.500700035

    15.62531.5010500525

    15.820312535.0012250613

    16.01562538.50140007

    16.210937545.5017500875

    16.4062552.502100105

    16.601562559.5024501225

    16.79687570.0029751488

    16.992187577.0033251663

    17.187584.0036751838

    17.382812591.0040252013

    17.57812598.0043752188

    17.7734375105.0047252363

    17.96875108.504900245

    18.1640625115.5052502625

    18.359375119.0054252713

    18.5546875122.50560028

    18.75126.0057752888

    18.9453125129.5059502975

    19.140625133.0061253063

    19.3359375136.506300315

    19.53125140.0064753238

    19.7265625143.5066503325

    19.921875147.0068253413

    20.1171875150.50700035

    20.3125150.50700035

    20.5078125154.0071753588

    20.703125157.5073503675

    20.8984375157.5073503675

    21.09375161.0075253763

    21.2890625161.0075253763

    21.484375164.507700385

    21.6796875168.0078753938

    21.875168.0078753938

    22.0703125171.5080504025

    22.265625171.5080504025

    22.4609375175.0082254113

    22.65625175.0082254113

    22.8515625178.50840042

    23.046875178.50840042

    23.2421875182.0085754288

    23.4375185.5087504375

    23.6328125185.5087504375

    23.828125185.5087504375

    24.0234375189.0089254463

    24.21875192.509100455

    24.4140625192.509100455

    24.609375192.509100455

    24.8046875196.0092754638

    25196.0092754638

    25.1953125199.5094504725

    25.390625199.5094504725

    25.5859375199.5094504725

    25.78125199.5094504725

    25.9765625199.5094504725

    26.171875203.0096254813

    26.3671875203.0096254813

    26.5625203.0096254813

    26.7578125203.0096254813

    26.953125203.0096254813

    27.1484375203.0096254813

    27.34375203.0096254813

    27.5390625203.0096254813

    27.734375203.0096254813

    27.9296875203.0096254813

    28.125203.0096254813

    28.3203125203.0096254813

    28.515625203.0096254813

    28.7109375203.0096254813

    28.90625199.5094504725

    29.1015625203.0096254813

    29.296875199.5094504725

    29.4921875199.5094504725

    29.6875199.5094504725

    29.8828125196.0092754638

    30.078125196.0092754638

    30.2734375196.0092754638

    30.46875196.0092754638

    30.6640625192.509100455

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    31.0546875192.509100455

    31.25189.0089254463

    31.4453125189.0089254463

    31.640625185.5087504375

    31.8359375185.5087504375

    32.03125185.5087504375

    32.2265625182.0085754288

    32.421875182.0085754288

    32.6171875178.50840042

    32.8125175.0082254113

    33.0078125175.0082254113

    33.203125171.5080504025

    33.3984375171.5080504025

    33.59375168.0078753938

    33.7890625168.0078753938

    33.984375164.507700385

    34.1796875161.0075253763

    34.375157.5073503675

    34.5703125157.5073503675

    34.765625154.0071753588

    34.9609375150.50700035

    35.15625147.0068253413

    35.3515625143.5066503325

    35.546875143.5066503325

    35.7421875140.0064753238

    35.9375136.506300315

    36.1328125133.0061253063

    36.328125129.5059502975

    36.5234375126.0057752888

    36.71875126.0057752888

    36.9140625122.50560028

    37.109375119.0054252713

    37.3046875115.5052502625

    37.5112.0050752538

    37.6953125108.504900245

    37.890625108.504900245

    38.0859375101.5045502275

    38.2812598.0043752188

    38.476562598.0043752188

    38.67187594.50420021

    38.867187587.5038501925

    39.062587.5038501925

    39.257812584.0036751838

    39.45312580.503500175

    39.648437577.0033251663

    39.8437573.5031501575

    40.039062570.0029751488

    40.23437566.50280014

    40.429687563.0026251313

    40.62559.5024501225

    40.820312556.0022751138

    41.01562556.0022751138

    41.210937549.0019250963

    41.4062545.5017500875

    41.601562542.0015750788

    41.79687542.0015750788

    41.992187538.50140007

    42.187535.0012250613

    42.382812531.5010500525

    42.57812528.0008750438

    42.773437524.500700035

    42.9687521.0005250263

    43.164062521.0005250263

    43.35937517.5003500175

    43.554687514.0001750088

    43.7510.5

    43.94531256.9998249912

    44.1406253.4996499825

    44.33593753.4996499825

    44.53125-0.0005250263

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    44.921875-3.500700035

    45.1171875-3.500700035

    45.3125-3.500700035

    45.5078125-3.500700035

    45.703125-3.500700035

    45.8984375-7.0008750438

    46.09375-7.0008750438

    46.2890625-7.0008750438

    46.484375-7.0008750438

    46.6796875-7.0008750438

    46.875-7.0008750438

    47.0703125-3.500700035

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    47.4609375-0.0005250263

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    48.0468753.4996499825

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    51.7578125-3.500700035

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    52.9296875-3.500700035

    53.125-3.500700035

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    53.515625-7.0008750438

    53.7109375-3.500700035

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    55.078125-3.500700035

    55.2734375-3.500700035

    55.46875-3.500700035

    55.6640625-3.500700035

    55.859375-3.500700035

    56.0546875-3.500700035

    56.25-3.500700035

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    56.640625-3.500700035

    56.8359375-3.500700035

    57.03125-3.500700035

    57.2265625-3.500700035

    57.421875-3.500700035

    57.6171875-3.500700035

    57.8125-3.500700035

    58.0078125-3.500700035

    58.203125-3.500700035

    58.3984375-3.500700035

    58.59375-3.500700035

    58.7890625-3.500700035

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    59.1796875-3.500700035

    59.375-3.500700035

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    59.765625-3.500700035

    59.9609375-3.500700035

    60.15625-3.500700035

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    60.7421875-3.500700035

    60.9375-3.500700035

    61.1328125-3.500700035

    61.328125-0.0005250263

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    74.21875-0.0005250263

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    Sheet1

    ASAP, no diode

    Time (micro-seconds)

    Current (A)

    Sheet2

    Sheet3

  • Firing Efficiency of Electro-Spark DepositionFiring rates defined by control systemIndividual pulse widths on the order of 10s of micro-secondsVariable contact pressures affect workpiece resistance and current flowSparking efficiency quality tool for assessing deposition characteristics70- 90% sparking efficiency deemed ideal

  • Electro-Spark Deposition (ESD) ProcessESD deposit characteristicsDeposit layers typically microns thickDeposition rates typically 105-oC/s)Non equilibrium solidification and suppression of solid-state transformations

  • Thermal Analysis of Various Localized Deposition Processes

    Chart1

    179.2480727152259.4379999825555.93857139111729.58666655193922.405275145

    173.6687094061251.3626057193538.63415511281675.7507047953187886.281503105

    168.1775573746243.4148856737521.60332644361622.7659044913181945.590517975

    162.7746166207235.5948398457504.84608538361570.632265638176100.332319754

    157.4598871444227.9024682353488.36243193281519.3497882353170350.506908444

    152.2333689457220.3377708425472.15236609111468.9184722833164696.114284043

    147.0950620247212.9007476673456.21588785851419.338317782159137.154446551

    142.0449663812205.5913987097440.55299723511370.6093247313153673.62739597

    137.0830820154198.4097239697425.16369422081322.7314931313148305.533132298

    132.2094089272191.3557234473410.04797881561275.704822982143032.871655536

    127.4239471166184.4293971425395.20585101961229.5293142833137855.642965683

    122.7266965837177.6307450553380.63731083281184.2049670353132773.847062741

    118.1176573283170.9597671857366.34235825511139.731781238127787.483946708

    113.5968293506164.4164635337352.32099328651096.1097568913122896.553617585

    109.1642126504158.0008340993338.57321592711053.3388939953118101.056075371

    104.8198072279151.7128788825325.09902617681011.41919255113400.991320067

    100.563613083145.5525978833311.8984240356970.3506525553108796.359351673

    96.3956302157139.5199911017298.9714095036930.1332740113104287.160170189

    92.315858626133.6150585377286.3179825808890.76705691899873.3937756144

    88.324298314127.8378001913273.9381432671852.252001275395555.0601679495

    84.4209492795122.1882160625261.8318915625814.588107083391332.1593471943

    80.6058115227116.6663061513249.9992274671777.77537434287204.6913133489

    76.8788850435111.2720704577238.4401509808741.813803051383172.6560664131

    73.2401698419106.0055089817227.1546621036706.703393211379236.0536063871

    69.6896659179100.8666217233216.1427608356672.44414482275394.8839332708

    66.227373271595.8554086825205.4044471768639.036057883371649.1470470643

    62.853291902890.9718698593194.9397211271606.479132395367998.8429477674

    59.567421811686.2160052537184.7485826865574.77336835864443.9716353803

    56.369762998181.5878148657174.8310318551543.918765771360984.5331099029

    53.260315462277.0872986953165.1870686328513.915324635357620.5273713352

    50.239079203972.7144567425155.8166930196484.7630449554351.9544196773

    47.306054223268.4692890073146.7199050156456.461926715351178.814254929

    44.461240520264.3517954897137.8967046208429.011969931348101.1068770905

    41.704638094760.3619761897129.3470918351402.41317459845118.8322861617

    39.036246946956.4998311073121.0710666585376.665540715342231.9904821426

    36.456067076652.7653602425113.0686290911351.769068283339440.5814650333

    33.96409848449.1585635953105.3397791328327.72375730236744.6052348337

    31.56034116945.679441165797.8845167836304.529607771334144.0617915438

    29.244795131642.327992953790.7028420436282.186619691331638.9511351636

    27.017460371939.104218959383.7947549128260.69479306229229.2732656931

    24.878336889736.008119182577.1602553911240.054127883326915.0281831324

    GTAW

    PAW

    PTA

    LBW

    ESD

    Temp (deg C)

    Cooling rate (deg C/sec)

    Sheet1

    Heat Input (J/mm)K =11.4W/(m-Co)

    GTAWPAWPTALBWESD0.0114J/(sec-mm-Co)

    649.6062992126448.8188976378209.448818897667.3228346457223 =0.0031998653mm2/sec

    Cp =0.435J/(g-Co)

    Travel speeds (mm/sec)Hm =297.135j/g

    GTAWPAWPTALBWESDxsp(ESD) =0.005mm

    0.46181818180.66842105261.81428571430.90608187130.8071748879Tm =1400

    To =25

    TempGTAWPAWPTALBWESDRGTAWPAWPTALBWESD

    1300179.2480727152259.4379999825555.93857139111729.586666551.94E+05014001400140014001400

    1280173.6687094061251.3626057193538.63415511281675.75070479531.88E+050.00051339.71150181821347.970370991303.40150769561325.80029746331224.5484694341

    1260168.1775573746243.4148856737521.60332644361622.76590449131.82E+050.0011281.89857637131265.70616450411106.0015251371211.65171044571053.5555809305

    1240162.7746166207235.5948398457504.84608538361570.6322656381.76E+050.00151226.72202025681188.722191685939.68375358631107.990004613891.1429417671

    1220157.4598871444227.9024682353488.36243193281519.34978823531.70E+050.0021174.05607439881116.666055567799.43887044351013.7956461801740.8001945623

    1200152.2333689457220.3377708425472.15236609111468.91847228331.65E+050.00251123.78131823421049.210021534681.0874827616928.1552174699605.1669913869

    1180147.0950620247212.9007476673456.21588785851419.3383177821.59E+050.0031075.7843284956986.0491904663581.1380757152850.2494604596485.913696246

    1160142.0449663812205.5913987097440.55299723511370.60932473131.54E+050.00351029.9573578164926.8998164579496.6702145234779.3427914317383.7269386205

    1140137.0830820154198.4097239697425.16369422081322.73149313131.48E+050.004986.1980319048871.4977567813425.2383113242714.774088146298.3889142789

    1120132.2094089272191.3557234473410.04797881561275.7048229821.43E+050.0045944.4090641192819.5970429173364.7921821695655.9485803634228.933040098

    1100127.4239471166184.4293971425395.20585101961229.52931428331.38E+050.005904.4979863616770.9685624872313.6113453159602.3306992038173.8399688642

    1080122.7266965837177.6307450553380.63731083281184.20496703531.33E+050.0055866.3768952733725.3988428502270.2505910554553.4377615451131.2501909174

    1060118.1176573283170.9597671857366.34235825511139.7317812381.28E+050.006829.9622127925682.6889279563233.4948168668508.834383152999.1627691245

    1040113.5968293506164.4164635337352.32099328651096.10975689131.23E+050.0065795.1744601907642.6533407992202.3214939468468.12752901675.6022516098

    1020109.1642126504158.0008340993338.57321592711053.33889399531.18E+050.007761.9380447687605.1191244869175.8694311254430.962121906158.7423165181

    1000104.8198072279151.7128788825325.09902617681011.419192551.13E+050.0075730.1810584439569.9249555654153.4127445418397.017140851446.9839320216

    980100.563613083145.5525978833311.8984240356970.35065255531.09E+050.008699.8350875128536.9203237809134.3391378547366.002150312838.9918495998

    96096.3956302157139.5199911017298.9714095036930.13327401131.04E+050.0085670.8350329191505.9647729724118.1317573259337.654208633533.6977382642

    94092.315858626133.6150585377286.3179825808890.7670569189.99E+040.009643.1189404022476.9271982388104.3540160719311.735111001630.2799359429

    92088.324298314127.8378001913273.9381432671852.25200127539.56E+040.0095616.6278399391449.685194941592.6368878745288.028927894128.1295256028

    90084.4209492795122.1882160625261.8318915625814.58810708339.13E+040.01591.3055939342424.12445547682.668257737266.339804904226.8109156085

    88080.6058115227116.6663061513249.9992274671777.7753743428.72E+040.0105567.0987536411400.138210088174.1839875428246.489994113826.0229050302

    86076.8788850435111.2720704577238.4401509808741.81380305138.32E+040.011543.9564233396377.62670832466.9604136319228.318090848125.5639520047

    84073.2401698419106.0055089817227.1546621036706.70339321137.92E+040.0115521.830131815356.496737979660.8080412267211.677452845925.3034416787

    82069.6896659179100.8666217233216.1427608356672.4441448227.54E+040.012500.67371072336.661178679555.5662403086196.434781642325.1593289995

    80066.227373271595.8554086825205.4044471768639.03605788337.16E+040.0125480.4431794227318.03858744551.0987803065182.468848371925.0816327864

    78062.853291902890.9718698593194.9397211271606.47913239536.80E+040.013461.0966359706300.552813828647.2900680619169.669348297925.040808563

    76059.567421811686.2160052537184.7485826865574.7733683586.44E+040.0135442.594153822284.132642384444.0419759797157.93587020425.0199032635

    74056.369762998181.5878148657174.8310318551543.91876577136.10E+040.014424.8976840188268.711460427141.2711659041147.176968386525.0094701197

    72053.260315462277.0872986953165.1870686328513.91532463535.76E+040.0145407.9709624938254.226949191638.9068297281137.309326388325.0043956077

    70050.239079203972.7144567425155.8166930196484.763044955.44E+040.015391.7794222238240.620796655836.8887806154128.25700284325.0019901726

    68047.306054223268.4692890073146.7199050156456.46192671535.12E+040.0155376.2901099598227.838430428435.1658394363119.950750879925.000878919

    66044.461240520264.3517954897137.8967046208429.01196993134.81E+040.016361.4716072768215.828769224333.6944699517112.327403490225.0003785931

    64041.704638094760.3619761897129.3470918351402.4131745984.51E+040.0165347.2939557076204.543991570132.4376237463105.329318091725.0001590536

    62039.036246946956.4998311073121.0710666585376.66554071534.22E+040.017333.7285857326193.939320483131.363762143398.903874266225.0000651694

    60036.456067076652.7653602425113.0686290911351.76906828333.94E+040.0175320.7482494154183.972822966430.446027549993.003019298825.0000260409

    58033.96409848449.1585635953105.3397791328327.7237573023.67E+040.018308.3269564854174.605223251429.661541052287.582856722125.0000101477

    56031.56034116945.679441165797.8845167836304.52960777133.41E+040.0185296.4399136783165.799728798828.990806735682.603273579125.0000038562

    54029.244795131642.327992953790.7028420436282.18661969133.16E+040.019285.0634671598157.521868145628.417206279978.027602574825.000001429

    52027.017460371939.104218959383.7947549128260.6947930622.92E+040.0195274.175047864149.739339754627.926569956173.82231568225.0000005164

    50024.878336889736.008119182577.1602553911240.05412788332.69E+040.02263.7531195925142.421871084827.506812316969.956746129725.0000001819

    Sheet1

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    GTAW

    PAW

    PTA

    LBW

    ESD

    Temp (deg C)

    Cooling rate (deg C/sec)

    Sheet2

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    00000

    GTAW

    PAW

    PTA

    LBW

    ESD

    Distance (mm)

    Temp (deg C)

    Sheet3

    MBD001CE07E.unknown

    MBD00BE3001.unknown

    MBD00BDE2E8.unknown

    MBD0013B23F.unknown

    Chart2

    14001400140014001400

    1339.71150181821347.970370991303.40150769561325.80029746331224.5484694341

    1281.89857637131265.70616450411106.0015251371211.65171044571053.5555809305

    1226.72202025681188.722191685939.68375358631107.990004613891.1429417671

    1174.05607439881116.666055567799.43887044351013.7956461801740.8001945623

    1123.78131823421049.210021534681.0874827616928.1552174699605.1669913869

    1075.7843284956986.0491904663581.1380757152850.2494604596485.913696246

    1029.9573578164926.8998164579496.6702145234779.3427914317383.7269386205

    986.1980319048871.4977567813425.2383113242714.774088146298.3889142789

    944.4090641192819.5970429173364.7921821695655.9485803634228.933040098

    904.4979863616770.9685624872313.6113453159602.3306992038173.8399688642

    866.3768952733725.3988428502270.2505910554553.4377615451131.2501909174

    829.9622127925682.6889279563233.4948168668508.834383152999.1627691245

    795.1744601907642.6533407992202.3214939468468.12752901675.6022516098

    761.9380447687605.1191244869175.8694311254430.962121906158.7423165181

    730.1810584439569.9249555654153.4127445418397.017140851446.9839320216

    699.8350875128536.9203237809134.3391378547366.002150312838.9918495998

    670.8350329191505.9647729724118.1317573259337.654208633533.6977382642

    643.1189404022476.9271982388104.3540160719311.735111001630.2799359429

    616.6278399391449.685194941592.6368878745288.028927894128.1295256028

    591.3055939342424.12445547682.668257737266.339804904226.8109156085

    567.0987536411400.138210088174.1839875428246.489994113826.0229050302

    543.9564233396377.62670832466.9604136319228.318090848125.5639520047

    521.830131815356.496737979660.8080412267211.677452845925.3034416787

    500.67371072336.661178679555.5662403086196.434781642325.1593289995

    480.4431794227318.03858744551.0987803065182.468848371925.0816327864

    461.0966359706300.552813828647.2900680619169.669348297925.040808563

    442.594153822284.132642384444.0419759797157.93587020425.0199032635

    424.8976840188268.711460427141.2711659041147.176968386525.0094701197

    407.9709624938254.226949191638.9068297281137.309326388325.0043956077

    391.7794222238240.620796655836.8887806154128.25700284325.0019901726

    376.2901099598227.838430428435.1658394363119.950750879925.000878919

    361.4716072768215.828769224333.6944699517112.327403490225.0003785931

    347.2939557076204.543991570132.4376237463105.329318091725.0001590536

    333.7285857326193.939320483131.363762143398.903874266225.0000651694

    320.7482494154183.972822966430.446027549993.003019298825.0000260409

    308.3269564854174.605223251429.661541052287.582856722125.0000101477

    296.4399136783165.799728798828.990806735682.603273579125.0000038562

    285.0634671598157.521868145628.417206279978.027602574825.000001429

    274.175047864149.739339754627.926569956173.82231568225.0000005164

    263.7531195925142.421871084827.506812316969.956746129725.0000001819

    GTAW

    PAW

    PTA

    LBW

    ESD

    Distance (mm)

    Temp (deg C)

    Sheet1

    Heat Input (J/mm)K =11.4W/(m-Co)

    GTAWPAWPTALBWESD0.0114J/(sec-mm-Co)

    649.6062992126448.8188976378209.448818897667.3228346457223 =0.0031998653mm2/sec

    Cp =0.435J/(g-Co)

    Travel speeds (mm/sec)Hm =297.135j/g

    GTAWPAWPTALBWESDxsp(ESD) =0.005mm

    0.46181818180.66842105261.81428571430.90608187130.8071748879Tm =1400

    To =25

    TempGTAWPAWPTALBWESDRGTAWPAWPTALBWESD

    1300179.2480727152259.4379999825555.93857139111729.586666551.94E+05014001400140014001400

    1280173.6687094061251.3626057193538.63415511281675.75070479531.88E+050.00051339.71150181821347.970370991303.40150769561325.80029746331224.5484694341

    1260168.1775573746243.4148856737521.60332644361622.76590449131.82E+050.0011281.89857637131265.70616450411106.0015251371211.65171044571053.5555809305

    1240162.7746166207235.5948398457504.84608538361570.6322656381.76E+050.00151226.72202025681188.722191685939.68375358631107.990004613891.1429417671

    1220157.4598871444227.9024682353488.36243193281519.34978823531.70E+050.0021174.05607439881116.666055567799.43887044351013.7956461801740.8001945623

    1200152.2333689457220.3377708425472.15236609111468.91847228331.65E+050.00251123.78131823421049.210021534681.0874827616928.1552174699605.1669913869

    1180147.0950620247212.9007476673456.21588785851419.3383177821.59E+050.0031075.7843284956986.0491904663581.1380757152850.2494604596485.913696246

    1160142.0449663812205.5913987097440.55299723511370.60932473131.54E+050.00351029.9573578164926.8998164579496.6702145234779.3427914317383.7269386205

    1140137.0830820154198.4097239697425.16369422081322.73149313131.48E+050.004986.1980319048871.4977567813425.2383113242714.774088146298.3889142789

    1120132.2094089272191.3557234473410.04797881561275.7048229821.43E+050.0045944.4090641192819.5970429173364.7921821695655.9485803634228.933040098

    1100127.4239471166184.4293971425395.20585101961229.52931428331.38E+050.005904.4979863616770.9685624872313.6113453159602.3306992038173.8399688642

    1080122.7266965837177.6307450553380.63731083281184.20496703531.33E+050.0055866.3768952733725.3988428502270.2505910554553.4377615451131.2501909174

    1060118.1176573283170.9597671857366.34235825511139.7317812381.28E+050.006829.9622127925682.6889279563233.4948168668508.834383152999.1627691245

    1040113.5968293506164.4164635337352.32099328651096.10975689131.23E+050.0065795.1744601907642.6533407992202.3214939468468.12752901675.6022516098

    1020109.1642126504158.0008340993338.57321592711053.33889399531.18E+050.007761.9380447687605.1191244869175.8694311254430.962121906158.7423165181

    1000104.8198072279151.7128788825325.09902617681011.419192551.13E+050.0075730.1810584439569.9249555654153.4127445418397.017140851446.9839320216

    980100.563613083145.5525978833311.8984240356970.35065255531.09E+050.008699.8350875128536.9203237809134.3391378547366.002150312838.9918495998

    96096.3956302157139.5199911017298.9714095036930.13327401131.04E+050.0085670.8350329191505.9647729724118.1317573259337.654208633533.6977382642

    94092.315858626133.6150585377286.3179825808890.7670569189.99E+040.009643.1189404022476.9271982388104.3540160719311.735111001630.2799359429

    92088.324298314127.8378001913273.9381432671852.25200127539.56E+040.0095616.6278399391449.685194941592.6368878745288.028927894128.1295256028

    90084.4209492795122.1882160625261.8318915625814.58810708339.13E+040.01591.3055939342424.12445547682.668257737266.339804904226.8109156085

    88080.6058115227116.6663061513249.9992274671777.7753743428.72E+040.0105567.0987536411400.138210088174.1839875428246.489994113826.0229050302

    86076.8788850435111.2720704577238.4401509808741.81380305138.32E+040.011543.9564233396377.62670832466.9604136319228.318090848125.5639520047

    84073.2401698419106.0055089817227.1546621036706.70339321137.92E+040.0115521.830131815356.496737979660.8080412267211.677452845925.3034416787

    82069.6896659179100.8666217233216.1427608356672.4441448227.54E+040.012500.67371072336.661178679555.5662403086196.434781642325.1593289995

    80066.227373271595.8554086825205.4044471768639.03605788337.16E+040.0125480.4431794227318.03858744551.0987803065182.468848371925.0816327864

    78062.853291902890.9718698593194.9397211271606.47913239536.80E+040.013461.0966359706300.552813828647.2900680619169.669348297925.040808563

    76059.567421811686.2160052537184.7485826865574.7733683586.44E+040.0135442.594153822284.132642384444.0419759797157.93587020425.0199032635

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    54029.244795131642.327992953790.7028420436282.18661969133.16E+040.019285.0634671598157.521868145628.417206279978.027602574825.000001429

    52027.017460371939.104218959383.7947549128260.6947930622.92E+040.0195274.175047864149.739339754627.926569956173.82231568225.0000005164

    50024.878336889736.008119182577.1602553911240.05412788332.69E+040.02263.7531195925142.421871084827.506812316969.956746129725.0000001819

    Sheet1

    GTAW

    PAW

    PTA

    LBW

    ESD

    Temp (deg C)

    Cooling rate (deg C/sec)

    Sheet2

    GTAW

    PAW

    PTA

    LBW

    ESD

    Distance (mm)

    Temp (deg C)

    Sheet3

    MBD00BDE2E8.unknown

    MBD00BE3001.unknown

    MBD0013B23F.unknown

    MBD001CE07E.unknown

  • Ni-Superalloy to Refractory Metal Joints for Space Nuclear PropulsionNuclear-powered space propulsionLunar-based powerGas cooled reactorBrayton cycle energy conversionRefractory metals at/near the reactorNickel-based superalloys at/near the turbineNeed for dissimilar materials transitions

  • Material Combinations of InterestRefractory to nickel-based superalloy jointsRefractory metal alloysMo-47.5 ReT-111 (Ta-8%W-2%Hf)Nickel-based superalloysHastelloy XMar M247Melting point suppression associated with eutecticsSolidification crackingLiquation crackingIntermetallic formationJoint ductilityPre-mature fracture

  • Electro-Spark Deposition Welding TrialsASAP 50-F electro-spark deposition systemWelding trials to be done in chamberHard glove boxOxygen levels
  • Electro-Spark Deposition Welding Trials Set-UpBonding procedureMachined joint prepESD fillJoint prep on reverse sideFinal fillPractice taken from EWI experienceSmall adaptations made to maintain surface quality

  • Electro-Spark Deposition Welding TrialsWelding of tensile specimensWeld prepDeposition practice:Hastelloy X electrode (1.5-mm diameter)40-F capacitance120-V charging voltage500-Hz firing rateThree specimens for materials combinationOne for metallographic sectionsFill patternsInternal fill qualityIntermetallic formationTwo samples each for mechanical testing

    Joint Preparation and Electrode Orientation for the ESD Welds made in this StudyESD Weld Current Waveform Taken from a Representative Deposit

    Chart1

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