Inspection Of Welds
As we have seen in previews website pages, defects in welds
are inevitable. Nevertheless, the poor weld quality leads to collapse.
Therefore, proper inspection and quality control of welded joints is essential.
Some of the commonly employed methods are discussed here.
1. Magnetic particle method
When iron fillings spread over the welded joint is
subjected to electric current, the forms patterns which can be utilised for
interpret and locating surface cracks.
2. Dye
penetration method
A dye is spread over the surface of weld in this
method and then the surplus is removed. Then dye absorber is placed on the
surface which oozes out the dye in the crack revealing the depth of surface
cracks.
3.
Ultrasonic method
Defects like flaws, blow holes, slag inclusion and
porosity of the welds can be evaluated by this method. When ultrasonic waves
are sent through the weld, these defects interfere with the wave propagation of
the waves affecting its travel time. The defects can be interpreted by
observing the travel time of the waves.
4. Radiography
In this
method, X-rays and gamma rays are used to locate the defects. This is used in
groove welds only.
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