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A Quick Guide to Welding and Weld Inspection

Steven E. Hughes
Steven E. Hughes
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Clifford Matthews
Clifford Matthews
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ASME Press
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Liquid penetrant examination, often called dye penetrant or penetrant testing (PT), is used to find surface breaking defects only. It involves the use of a cleaner (degreaser), a liquid penetrant and a developer. The most common PT system on site involves the use of these three materials from cans and is referred to as the ‘three can system’. Figure 6.1 shows the idea.

A typical colour contrast procedure involves preparing the surface to remove any spatter, slag or other imperfections that could retain the penetrant and mask relevant indications. The surface is then thoroughly cleaned, using the cleaner, to remove...

Liquid penetrant testing (PT)
Magnetic particle testing (MT)
Ultrasonic testing (UT)
Radiographic testing (RT)
Tension tests
Bend tests
Charpy tests
Hardness testing
Macro samples
Micro samples
Fillet fracture test
Butt weld fracture test (nick break)
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