| 摘要 |
An arc welding voltage control loop adjusts a pulsation parameter such as pulse width, pulse amplitude, background amplitude between pulses, or frequency, to compensate for deviations in arc voltage. A second, slower feedback loop adjusts a second parameter to cause the pulsation parameter to return to a desired value due to the effect of the adjusted second parameter on the arc voltage. The second parameter may be the torch-to-workpiece distance, adjusted via a proximity control motor (119) so that when the torc h- to-work distance begins to change due to misalignment or changes in workpiec e contour during torch movement along the weld path, the weld power source voltage control loop adjusts the pulsation parameter keeping the voltage equ al to the voltage command. The slower proximity control adjusts the torch-to- workpiece distance until the voltage control loop returns the pulsation parameter to its original value.
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