METHODS FOR PRODUCING WELD JOINTS HAVING THERMALLY ENHANCED HEAT-AFFECTED-ZONES WITH EXCELLENT FRACTURE TOUGHNESS

摘要

Methods of welding two pieces of metal (100, 101) to pro duce a weld joint having excE!Ilent fracture toughness are provided. Two pieces of metal (100, 101) are positioned for welding so as to form a narrow weld groove having two sidewalls (103, 104) with bevel angles (107) of less than about 10°. Two or more layers are appl ed to the weld groove to produce the weld joint such that the heat-affected-zone of the weld joint is substantially free of rogue grains.