It is destructive test for finding the crackability weld joints. This test only for plates and sections having thickness 12 mm and above for Grade E 250 C material. This test is not applicable for rounds. It is performed using an electrode of diameter 4 mm . Here, the welding parameter strictly recorded to get the desired result.
After performing test it is remain for about 48 hour and after that magnetic particle inspection is done to find the crack in welded region.