| 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 occurrence of burn-through by reducing the deviation of the generation timing of two arcs. SOLUTION: In the start synchronizing arc welding method, feed of first and second welding wires is started at the slow-down speed Fi1 and Fi2, respectively. When the first welding wire is brought into contact with a work and a first arc is generated first (t2), the condition is kept on standby, and when the second welding wire is brought into contact with the work later and a second arc is generated (t3), the standby is over, and both welding wires are moved along each pre-taught welding line to perform the welding. The standby period Td2 is shortened by changing the slow-down speed of the second welding wire from the normal value Fi2 to the predetermined high slow-down speed Fh when the first arc is generated. COPYRIGHT: (C)2008,JPO&INPIT
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