FORMATION OF TEST-PIECE FOR WELD DEFECT CRACKING

摘要

PURPOSE:To generate a weld defect crack of desired size by forming a defect cracking weld bead at the center part of a groove part and nondefect weld beads on both its sides. CONSTITUTION:An excessive current is used for CO2 arc welding firstly. The welding is carried on without stopping at the crater of a weld bead, which is then quenched with water; and a notch-shaped stripe is formed nearly at the center part of the bead by grinding to form the 1st layer defect crack weld bead 11. Then, a proper current is used for arc welding to form nondefect weld beads 21 and 22. Then, those defect crack weld bead and nondefect crack weld beads are formed alternately to form a weld defect crack 30 in the weld zone between test-pieces 1 and 2.