PROBLEM TO BE SOLVED: To provide an excellent construction preventing the penetration of outside air by discharging shield gas from an upper part vertical hole to the outside air after shielding a blowout port by the outer periphery of a bar, and discharging other gas to the outside from the welding part along the right and left bars.;SOLUTION: By manufacturing a gas supply device by only drilling and cutting work of a copper single body, manufacturing becomes simple and construction becomes rigid, thereby in using for deformed bar welding work in the construction site and the high place, damages are lessened to serve for decrease in repair and maintenance.;COPYRIGHT: (C)2003,JPO
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