Welder Red Seal · Question
In pulsed Gas Metal Arc Welding (GMAW-P), what is the function of the low-level 'background current'?
In GMAW-P, the high peak current propels a droplet. Between these peaks, a low background current is maintained. It is not hot enough to cause metal transfer, b
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Question: In pulsed Gas Metal Arc Welding (GMAW-P), what is the function of the low-level 'background current'?
Answer options:
- To provide the main force for transferring the metal droplet.
- To preheat the base material ahead of the weld pool. ✅ To maintain the arc and keep the wire tip molten between pulses.
- To create a protective magnetic field around the arc.
Correct answer: To maintain the arc and keep the wire tip molten between pulses.
Explanation: In GMAW-P, the high peak current propels a droplet. Between these peaks, a low background current is maintained. It is not hot enough to cause metal transfer, but it sustains the arc and keeps the electrode wire tip hot, preparing it for the next pulse, which allows for out-of-position spray transfer.
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