| 摘要 |
PURPOSE:To stabilize an arc and to improve the toughness of weld metal by using a pulse power source having the specific number of pulses and using shielding gas with a low mixing ratio of CO2 and O2. CONSTITUTION:The pulse power source 1 having a pulse generator 2 with the number of pulses 300-1000pps is provided and a welding bed 3 and a bomb 9 for the shielding gas such as CO2, Ar, etc., are arranged. The shielding gas is supplied from the shielding gas bomb 9 to the welding bed 3 by regulating its pressure and flow rate by a regulator 7 and a current impressed with a pulse from the power source 1 is conducted to the welding bed 3 and an object 10 to be welded and a wire 6 is fed to the welding bed 3 to perform the welding. Since the energy density becomes high by taking in the pulse, even if the mixing ratio of CO2 and O2 is low, the arc is stabilized. Further, since the contents of N and O in the weld metal are reduced, the toughness of the weld metal is improved.
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