| 摘要 |
PURPOSE:To obtain a sound weld bead by preventing a weld metal from flowing out of the end part, by blowing inert gas to the end part of a steel plate, at the time of welding of the end part of the steel plate. CONSTITUTION:At the time of welding a welding object 1 from its end part 2 by an automatic welding machine 3 of inert gas such as argon, etc., inert gas of a cylinder 6 is supplied from an inert gas blowing nozzle 4 provided in the vicinity of the end part 2. In that case, a solenoid valve 7 is placed in the delivery of the cylinder 6 and operated, and blowing and stopping of the inert gas are executed by a remote control. According to this method, when welding surfaces of the steel plate 1 are butted and inert gas welding is executed, a weld metal flowing out of the steel plate end part 2 can be prevented by the inert gas blown from the nozzle 4. Accordingly, the undercut and lack of penetration in the first and the last end parts of welding are eliminated completely, and a sound weld bead can be obtained.
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