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because the current is regulated rather than the voltage
all the motions are controlled by movement that has been programmed.
you cant see whats going on with the arc so to make adjustments you have to reprogram the motion after you stop and see what happened.
perhaps you can set it for constant voltage and get better results.
perhaps constant voltage is better for different materials.
most smaller wire feeds are constant voltage which tends to keep the arc length constant.
the operator can watch what he doing if he can see the arc and can make all manner of small adjustments. without reprogramming the controls.
stick welding is possible because you can watch what you are doing to keep arc length constant the machines are almost always constant current
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