| 摘要 |
PROBLEM TO BE SOLVED: To provide a start synchronized arc welding method for welding two weld parts while synchronizing the welding start by using two welding torches which is capable of suppressing a phenomenon of insufficient penetration of a forward portion at the welding starting position on the side where an arc is generated first. SOLUTION: In the start synchronizing arc welding method, first and second welding torches are shifted to each pre-taught welding starting position (t1). When a first arc is generated first (t2), the condition is kept on standby, and when a second arc is generated later (t3), the standby is over, both welding torches are shifted along each pre-taught welding line to perform the welding. The terminating position is pre-taught to a rear side or a diagonally rear side with respect to the welding direction from the welding starting position of the first arc, and the first arc is subjected to the weaving Su between the welding starting position and the terminating position during a part of or the entire standby period Td. COPYRIGHT: (C)2008,JPO&INPIT
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