| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for controlling a gas for arc welding, which includes: performing satisfactory arc starting while deciding that a gas flow rate at the start of welding is appropriate. <P>SOLUTION: The method for controlling a gas in arc welding includes: stopping supply of a welding current at the start of welding while flowing a shielding gas only in a determined preflow period, and supplying a welding current while flowing the shielding gas continuously after completing the preflow period, in which a decrease rate of the gas flow rate when the preflow period has completed is calculated, and when the decrease rate is less than a predetermined standard decrease rate, the welding current is supplied, and when the decrease rate is equal to or more than the standard decrease rate, the welding current is supplied while waiting till the decrease rate is less than the standard decrease rate. <P>COPYRIGHT: (C)2012,JPO&INPIT |
