| 摘要 |
PURPOSE:To prevent the waste of shielded gas and to increase the life of electrodes by providing the circuit for reducing the flow of the shield gas to feed for the prescribed time in succession after the extinction of the arc for welding or cutting less than the flow under the arc generation. CONSTITUTION:As for the preparation prior to the welding work shielded gas is passed from gas source 4 with a solenoid valve 6 closed and solenoid valve 2 open and adjusted by the flow regulator 3 with pressure regulator in the prescribed flow quantity necessary for during the arc generation. It is then adjusted so that the gas flow becomes the prescribed reduced value after the arc extinction by a flow control valve 7 with the solenoid valve 2 closed and solenoid valve 6 open. In the main welding the shielded gas is fed to torch 1 with the solenoid valve 2 open and solenoid valve 6 of other part closed during the arc generation. The gas after arc extinction is passed for the prescribed time in the preset prescribed flow quantity with the solenoid valve 2 closed and solenoid valve 6 open immediately after the arc extinction.
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