Pulsed Arc Welding
An arc welding process where current alternates rapidly between a low background level and a high peak value to limit thermal input.
Pulse welding is basically a normal welding process where the current flows in rapid pulses instead of constantly. The advantage is that you keep the material significantly cooler because the heat can drop briefly between current peaks. This gives you a calmer, more stable weld pool and less distortion on the workpiece. If you don't set the parameters cleanly, the pool will either become too fluid and run away, or you'll get an unclean, cold weld with lack of fusion. Make sure the pulse frequency and current match the material and wire size. Start conservatively and adjust until the arc is steady and the weld melts in cleanly without overheating the material.