GMAW Welding Level 2 Practice Test

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In a constant-voltage welding machine, increasing electrode extension affects current by decreasing it.

Current decreases

In a constant-voltage welding machine, the voltage is kept at a fixed level. Increasing electrode extension lengthens the arc, which increases the arc’s resistance. With the voltage held constant, Ohm’s law (I = V/R) means the current must drop as resistance rises. So the current decreases when you increase electrode extension.

Voltage decreases

Current increases

Wire feed rate increases

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