METHOD FOR PREVENTING FOLDING OF ROOT TOE OF BACK BEAD OF MULTI-PASS WELDING OF SINGLE BEVEL GROOVE

摘要

PURPOSE: To provide a welding method to eliminate the crack pseudo defect of the multi-pass welding of the single groove in achieving the welding or the circumferential welding of a steel stnucture. ;CONSTITUTION: In the welding of at least the second and the third pass bead subsequent to the initial back bead welding of the multi-pass welding of the single bevel groove, the alternate welding of two passes of 5-15kJ/cm in the heat input for each pass where the vertical side of the single bevel groove is the preceding pass is achieved. In addition, the welding heat input of the preceding pass is set to 15-25kJ/cm, and the welding heat input of the succeeding pass is set to 5-12kJ/cm.;COPYRIGHT: (C)1996,JPO