E U R O J O I N 4E U R O J O I N 4DEVELOPMENT OF WELDING AND ALLIEDDEVELOPMENT OF WELDING AND ALLIED

PROCESSES AT THE BEGINNING OF THE NEW MILLENIUMPROCESSES AT THE BEGINNING OF THE NEW MILLENIUM

Cavtat-Dubrovnik, 24-26 May, 2001

CONTRIBUTION TO THE ANALYSIS OF CONTRIBUTION TO THE ANALYSIS OF MATERIAL TRANSFER IN GAS-MATERIAL TRANSFER IN GAS-

SHIELDED METAL-ARC WELDINGSHIELDED METAL-ARC WELDING

by Marjan Subanby Marjan Suban

FOR MORE INFO VISITFOR MORE INFO VISIT http://sites.google.com/site/chaosweld/http://sites.google.com/site/chaosweld/

My web page: http://www2.arnes.si/~msuban1/

INTRODUCTION TO CHAOSINTRODUCTION TO CHAOS

Deterministic Stochastic

Chaotic

Dynamical systemsDynamical systems

THE CHAOTIC BEHAVIOR OF THE CHAOTIC BEHAVIOR OF THE DRIPPING FAUCETTHE DRIPPING FAUCET

Maps for theMaps for thedripping faucet-dripping faucet-period oneperiod one

THE CHAOTIC BEHAVIOR OF THE CHAOTIC BEHAVIOR OF THE DRIPPING FAUCETTHE DRIPPING FAUCET

Maps for theMaps for thedripping faucet-dripping faucet-period twoperiod two

THE CHAOTIC BEHAVIOR OF THE CHAOTIC BEHAVIOR OF THE DRIPPING FAUCETTHE DRIPPING FAUCET

Maps for theMaps for thedripping faucet-dripping faucet-period threeperiod three

THE CHAOTIC BEHAVIOR OF THE CHAOTIC BEHAVIOR OF THE DRIPPING FAUCETTHE DRIPPING FAUCET

Maps for theMaps for thedripping faucet-dripping faucet-chaoschaos

THE CHAOTIC BEHAVIOR OF THE CHAOTIC BEHAVIOR OF THE DRIPPING FAUCETTHE DRIPPING FAUCET

Bifurcation diagram for dripping faucetBifurcation diagram for dripping faucet

THE CHAOTIC BEHAVIOR OF THE CHAOTIC BEHAVIOR OF THE DRIPPING FAUCETTHE DRIPPING FAUCET

Material transferMaterial transfer

THE CHAOTIC BEHAVIOR OF THE CHAOTIC BEHAVIOR OF IN GMAWIN GMAW

similarity

Material transferMaterial transfer

U

I t [ms]

t [ms]

t

c

o k

U

I t [ms]

t [ms]

t

tct

THE CHAOTIC BEHAVIOR OF THE CHAOTIC BEHAVIOR OF IN GMAWIN GMAW

Principle transfer modesin GMAW are:•short-circuit,•globular,•spray.

SHUNTV

mV

POWERSOURCE

WORKPIECE

+

_ ARC

WIRESHIELDING GAS

LOW-PASSFILTER

ADCOMPUTER

LOW-PASSFILTER

0

100

200

300

400

500

600

t [ms]

I [A

]

0

10

20

30

40

50

0 20 40 60 80 100 120 140 160 180 200

U [V

]

t tO KS

EXPERIMENTAL SETUPEXPERIMENTAL SETUP

RESULTSRESULTS

0

10

20

30

40

50

60

70

0 10 20 30 40 50 60 70

t (n)

t (n

+1

)

Welding parameters:Welding parameters:I = 69 AI = 69 AU = 15.6 VU = 15.6 V

RESULTSRESULTS

Welding parameters:Welding parameters:I = 86 AI = 86 AU = 16.2 VU = 16.2 V

0

10

20

30

40

50

60

70

0 10 20 30 40 50 60 70

t (n)

t (n

+1

)

RESULTSRESULTS

Welding parameters:Welding parameters:I = 92 AI = 92 AU = 16.6 VU = 16.6 V

0

10

20

30

40

50

60

70

0 10 20 30 40 50 60 70

t (n)

t (n

+1

)

RESULTSRESULTS

Welding parameters:Welding parameters:I = 107 AI = 107 AU = 17.1 VU = 17.1 V

0

10

20

30

40

50

60

70

0 10 20 30 40 50 60 70

t (n)

t (n

+1

)

RESULTSRESULTS

Welding parameters:Welding parameters:I = 160 AI = 160 AU = 19.1 VU = 19.1 V

0

10

20

30

40

50

60

70

0 10 20 30 40 50 60 70

t (n)

t (n

+1

)

RESULTSRESULTS

Welding parameters:Welding parameters:I = 189 AI = 189 AU = 21.5 VU = 21.5 V

0

10

20

30

40

50

60

70

0 10 20 30 40 50 60 70

t (n)

t (n

+1

)

CONCLUSIONSCONCLUSIONS

We did not find any chaotic We did not find any chaotic behavior for short-circuit behavior for short-circuit

material transfer in GMAW.material transfer in GMAW.