Can You Weld on a truck
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Joined: Sep 2006
Posts: 138
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From: Walnut Springs, TX
Cemf?
This spike occurs because the high current path through the welding cables, the weld pool and the arc itself will set up a significant electromagnetic field around itself. When this field collapses very suddenly as the arc is switched off, it will induce a voltage pulse in nearby electrical circuits even if they are electrically isolated from the actual welding current path.
Sounds like the classic explanation for Counter Electro-Motive Force (CEMF). Inductive loading is a very real problem - we see it every day on the grid when we try to maintain a careful balance between inductive loads and reactive loads (capacitance).
Dry Creek
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