| 摘要 |
The inventive system and method allows the control of shielding gas in an electric welding apparatus having automatic wire feed by controlling the flow rate of the shielding gas as a function of the wire feeding speed and/or the welding current obtained. A control circuit 112 receives an input signal 203 that is representative for the wire feeding speed and/or the welding current, and issues, in response to the input signal 203 , a control signal 206 to a controllable flow control valve 110 in a gas supply line 201, 202, 208 , which passes shielding gas from a tank 101 , via a regulator valve 102 , to a discharge nozzle of the welding apparatus welding gun. An adjusting unit 113 provides an operator with an interface which permits adjustment of the parameters that determine the flow rate function.
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