| 摘要 |
PURPOSE:To eliminate the contact of a torch with base metal and to prevent the generation of welding defect by maintaining the length of arc constant by adding a correcting voltage to the set voltage in the crater treatment to reduce gradually arc current at the weld completion time of TIG welding. CONSTITUTION:Craters treatment is performed by reducing gradually the arc current at the welding completing time in the TIG arc welding to maintain the length of arc constant by driving the torch driving motor 9 according to the deviation between the detected arc voltage 6 and set arc voltage 4 with the use of He shielding gas. In this case the contact of the torch 3 with base metal 1 is prevented by maintaining the arc length nearly constant with the addition 5 of correcting voltage 10 to the set voltage 4, the generation of welding defect due to contact is eliminated and the welding is better completed.
|
