Beginning terminal treatment manner null of consumable electrode

摘要

PURPOSE: To prevent facts that a projecting part is formed in an initial and a terminal end by a consumable electrode welding, and a welding defect is generated. ;CONSTITUTION: In a welding initial part, the relative movement of a welding device and a welding member is started in a state that a torch is rotated so that two pieces of wires are superposed in a welding direction, thereafter, welding is started by allowing one wire to go in/out, and also, the torch is subjected to reciprocating rotation at a necessary rotation angle and a narrow width initial weld zone 21 is formed, thereafter, when a welding pool is stabilized, the torch is fixed by rotating by 90° from a state that the wires are superposed in the welding direction, and also, a wide width steady weld zone 22 is formed by allowing the other wire, as well to go in/out by varying its phase against the one wire, and in a welding terminal part, the relative movement speed of the welding device and the welding member is increased, and also, a high temperature terminal welding zone 23 is formed by increasing the going-in/out speed of the two pieces of wires.;COPYRIGHT: (C)1993,JPO&Japio