| 摘要 |
PURPOSE:To prevent the generation of welding defects in the next welding starting by feeding a filler wire which is fed backward just prior to ending of TIG welding forward by the length corresponding to the backward feed till the next welding starting by the use of a controller. CONSTITUTION:A welding control circuit 10 controls an electric power source 9 for TIG welding, a gas controlling circuit 11 and other circuit parts 12-19 in the device. The forward feed controlling circuit 15 feeds a filler wire 6 forward and the speed and length thereof are controlled respectively by the feed speed controlling circuit 12, the forward feed speed regulator 13 and the forward feed time setting circuit 14. The power source device 9 generates the arc caused by high frequencies between a W electrode 4 and the objects 1a, 1b to be welded, thereby forming a welded zone 8. The controlling of the filler wire just prior to the end of the welding is accomplished by the backward feed control circuit 18, the backward feed speed regulator 16, and the backward feed time setting circuit 17. After the end of the welding, the filler wire is fed forward by the same length as the length by which it is fed backward. |
