| 摘要 |
PURPOSE:To increase the welding speed and to improve the welding characteristics by performing the welding by mixing the lean gas of the prescribed flow quantity in the shielded gas of the specified flow quantity. CONSTITUTION:A welding torch 1 and wire-like electrode 3 are arranged in opposition to the body 2 to be welded. The welding current is passed via current conduit 4 and lead wire 5 to the electrode 3 and arc 7 is produced on the tip as well. In this case, the shielded gas G mixing the lean gas of 0.001-0.2l/min to the argon gas, etc. of 5-6l/min flow quantity is fed to the gas feeding port 6 of the torch 1. As for the lean gas, at least one kind among hydrogen, oxygen and carbonic acid gases is used. With the mixture of this lean gas in minute quantity the welding speed is increased nearly twice and the welding characteristic is improved as well.
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