Prevention of Lamellar Tearing in Multipass Welded Corner Joint :

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説明

Lamellar tearing of opening type occasionally occurs in multipass welded corner joints. Effects of gas cutting for the edge surface of the vertical plate and shapes of groove on the occurrence of the lamellar tearing are investigated experimentally and theoretically. The main results obtained in this study are as follows. (1) In the cases where the edge surface of the vertical plate is prepared by gas cutting or machine, the transverse welding residual stress on the edge surface of the vertical plate reaches approximately the yield point at a position 10 mm away from the toe and the lamellar tearing occurs, when the intensity of bending restraint increases. No difference between these cases is observed in the critical intensity of bending restraint for lamellar tearing. (2) In order to reduce transverse welding residual stresses and to prevent the occurrence of the lamellar tearing, it is effective to use such a groove that the edge of the vertical (web) plate is projected out of the upper surface of the flange plate or that the vertical plate is cut obliquely.

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