WELD INSPECTION USING FLUORESCENT DYE PENETRANT FIELD OF APPLICATION Equipments / Parts Any manufactured or repaired welds Standards ASTM, E 165-09 ASTM, E 1417-05 Materials Aluminum Stainless Steel Carbon Steel Titanium Almost all welded materials Temperatures Min.: 4 °C ( 40 °F ) Max.: 45°C ( 113 °F ) Geometry Must be able to completely remove the liquid penetrant Surface Conditions Paint: No surface coating Applicable with weld build-up Indications of interest ▪ Cracks ▪ Lack of fusion ▪ Porosities Technique : Fluorescent dye penetrant testing ADVANTAGES DISADVANTAGES ▪ Applicable to a variety of geometry ▪ Applicable to almost all materials ▪ Simple technique ▪ Intuitive interpretation ▪ Many steps, with waiting times ▪ Strictly for surface connected defects ▪ Almost no information about indication depth This type of inspection is performed in 5 steps. First surfaces to be inspected must be cleaned, then the fluorescent penetrant is applied on the surface. After a certain dwell time to let the liquid penetrate potential surface defects, the excess of liquid penetrant is removed. Then a developer is vaporised on the same surface to absorb the liquid penetrant left into the surface defects. The final step is to carefully look for fluorescent indications using a UV light. The use of a fluorescent penetrant helps to detect very small defects. BRIEF DESCRIPTION : AEROSPACE INDUSTRY REPRESENTATION(S) TORNGATS Technical Services inc. 2900, Quatre-Bourgeois, Local #303, Quebec city, G1V 1Y4 Tel. : 418 781-2579 Fax : 418 907-8420 www.torngats.ca Two pictures of the same crack in a weld of an aircraft heat exchanger
Transcript
WELD INSPECTION
USING FLUORESCENT DYE PENETRANT
FIELD OF APPLICATION Equipments / Parts Any manufactured or
repaired welds
Standards ASTM, E 165-09 ASTM, E 1417-05
Materials Aluminum Stainless Steel Carbon Steel Titanium Almost all welded materials
Geometry Must be able to completely remove the liquid penetrant
Surface Conditions Paint: No surface coating Applicable with weld build-up
Indications of interest
▪ Cracks
▪ Lack of fusion
▪ Porosities
Technique : Fluorescent dye penetrant testing
ADVANTAGES DISADVANTAGES
▪ Applicable to a variety of geometry
▪ Applicable to almost all materials
▪ Simple technique
▪ Intuitive interpretation
▪ Many steps, with waiting times
▪ Strictly for surface connected defects
▪ Almost no information about indication depth
This type of inspection is performed in 5 steps. First surfaces to be inspected must be cleaned, then the fluorescent penetrant is applied on the surface. After a certain dwell time to let the liquid penetrate potential surface defects, the excess of liquid penetrant is removed. Then a developer is vaporised on the same surface to absorb the liquid penetrant left into the surface defects. The final step is to carefully look for fluorescent indications using a UV light. The use of a fluorescent penetrant helps to detect very small defects.
BRIEF DESCRIPTION :
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REPRESENTATION(S)
TORNGATS Technical Services inc. 2900, Quatre-Bourgeois, Local #303, Quebec city, G1V 1Y4 Tel. : 418 781-2579 Fax : 418 907-8420 www.torngats.ca
Two pictures of the same crack in a weld
of an aircraft heat exchanger
WELD INSPECTION
USING FLUORESCENT DYE PENETRANT Technique : Fluorescent dye penetrant testing
LIMITS OF DETECTION MEASUREMENTS ACCURACY
▪ Welds with rough build-ups could be harder to clean and leave some penetrant that could hide small indications
▪ Minimal defect size : 0,5 mm (0.020’’)
▪ Dimensions : ± 1 mm (0.040’’)
▪ Position : ± 1 mm (0.040’’)
▪ Depth : The size of the indication (amount of absorbed penetrant) might give a comparative value from a similar indication, at the most
▪ The technician must have a safe access to the area to be inspected.
▪ For outside inspection, surfaces must be dry and above freezing point.
OTHER COMMENTS FOR SITE INSPECTION
▪ Except access to the inspection location, count about 5 minutes for preparation and calibration.
▪ Once on site :
- To inspect only a six inches weld might take up to 45 minutes, due to waiting times,
- Five short welds (<6’’) to be inspected in the same area would require approximately 60 minutes.
▪ From 10 to 15 minutes per task should be counted to report inspection results. These estimations should be used only as guidelines and can’t be a commitment, since every job has its own particularities. For a fixed price, please ask for a quotation.
ESTIMATED EFFICIENCY
▪ Inspection reports contain :
- Inspected aircraft details
- Performed task details
- Flaw position and size, if any
- Certified inspector approval
REPORTING
Procedure : Certification : According to the NDT manual of the aircraft NAS 410, LPI Level 2
AS - Weld Inspection Using Fluorescent LPI Version 1, 2011-06-17
This document only aims to express the main frame of this application et does not necessarily represent the absolute limitations of this technique. For any needs outside this scope, simply contact us to validate feasibility.
