Pulsed Arc
A modified MIG/MAG arc where base current and pulse current alternate periodically to achieve a controlled droplet transfer per pulse. This prevents spatter and allows precise control over heat input.
With pulsed arc welding, you alternate between a low background current and a short, powerful pulse current. The background current keeps the arc stable, and the pulse melts the material in a targeted way, so the filler metal transfers cleanly drop by drop. This gives you little spatter and good heat control, which is especially important for thin sheets or for a clean weld appearance. If you set the pulse too high, the pool heats up quickly and the grain structure can become coarse. If the background current is too weak, the arc breaks or the weld becomes porous. You have to match the ratio of background to pulse current to the material and choose the frequency so that the droplet transfer runs smoothly and evenly. In practice, you first set the background current on the machine so that the arc burns stably, then add the pulse until the transfer drips in a controlled manner. Make sure the pulses are not too long or too strong, otherwise the weld pool overheats. This process is well suited for fine work where you want to introduce little heat but still need a clean, strong weld.