| 摘要 |
PURPOSE:To eliminate the defect caused in a welding metal especially a blow hole by performing a TIG welding with flowing to non-consumable electrode the pulsating current specifying respectively a frequency range and peak value range. CONSTITUTION:A TIG welding is performed with feeding a pulsating current to a non-consumable electrode under the conditions of 10-100Hz frequency f, 10-500Amp peak value W (W=current value IP on high current side -current value IP on low currentside) and 0.5-5.0 Amp/sec. Namely, due to the current on high current side and the current on low current side being flowed with a fixed period (frequency f) when the pulsating current having said conditions is fed to non-consumable electrode, a molten pool changes in said fixed period by the arc pressure received from the non-consumable electrode. Namely the variation in this arc pressure acts directly on the molten pool and as a result the agitation of the molten pool is performed, the gas remaining inside the molten pool is scattered outside the molten pool and the generation of a blow hole can be prevented as far as possible. |
