Dynamics air store tank its material is 20g results some defects from repair welding. To distinguish the defect's character, RT, UT, MT, hardness test (HT), field metallographic test (FMGT) etc. were used. The result of RT and UT shows that the defect is crack. And none of surface crack is discovered by MT combining the material's and technology's feature, it can be said that the possibility of postpone crack is baseless. The result of HT and FMGT denies the possibility of postpone crack further-more. By comprehensive distinguishing the results of testings, the crack in the repairing location is a original one, or is one that the original one was not cleared up completely, and grow up by the function of heat circulating, or is a kind of liguided crack which comes into the welded seam by the function of heat circulating. A foundation has been advanced that the program of repairing could be improved furthermore.
Publication Source: Trends in NDE Science & Technology; Proceedings of the 14th World Conference on Non-Destructive Testing, New Delhi, 8-13 December 1996.Vol. 2, pages 657 - 662 Publisher:Ashgate Publishing Company
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