Pulsed Arc Background Current Optimization
Optimizing the background current in pulsed arc ensures the arc does not extinguish between high-current pulses and the weld pool is supported in a controlled manner. Too low a background current leads to arc outages, too high increases thermal load.
Physical-Chemical Mechanism of Action
The background current in pulsed arc keeps the arc active between high-current pulses and stabilizes the weld pool. Too low a background current can cause the arc to go out or not be sufficiently bright, affecting weld quality. Too high a background current increases thermal load on the material and can cause overheating and distortion.
Metallurgical Relevance & Welding Risks
An unoptimized background current can lead to arc outages, poor fusion, and irregular weld profiles. This increases the likelihood of cracking and reduces joint strength. Excessive load can also cause hot cracking and distortion in the material.
Shop Practice & Handling Instructions
To optimally set the background current in pulsed arc, it should be between 20% and 30% of the peak current. This ensures stable arc initiation and controlled weld pool. If you have arc outage problems, first check the background current settings. If issues persist, it is advisable to reduce the peak current or shielding gas flow.