| 摘要 |
Apparatus and method for use in controlling blanket gas flow in an electrical welding facility, wherein welding is performed using a welding electrode in electrical connection with a welding machine unit. The apparatus comprises an electric measuring device having a current sensor 3 adapted to determine the magnitude of an electrical welding current carried in a circuit incorporating the welding electrode and having a current sensor output adapted to provide a I signal indicating the current magnitude, and a voltage sensor 11 adapted to determine the magnitude of an electrical voltage being applied to the welding electrode and having a voltage sensor output for providing a U signal indicating the voltage magnitude, and a control device 6. The control device 6 has inputs connected to the current sensor output and the voltage sensor output, respectively, and a control signal output for providing a control signal to a blanket gas flow controller 7, and a controller adapted to provide the control signal as a) a control signal of a predetermined first magnitude when the U signal is larger than the first U threshold and the I signal is less than a first I threshold, and b) a control signal of a magnitude varying proportionally with the I signal when the I signal is greater than the first I threshold. |
