Pulsed Arc Welding
Pulsed arc welding is a welding process with periodic current switching between background and pulse current to release precise droplets. It enables spatter-free welding and precise heat control.
Physical-Chemical Mechanism
The process uses a periodic switch between a continuous background current and a high pulse current. The pulse current releases exactly a certain amount of metal per droplet, while the background current prepares and stabilizes the surface.
Metallurgical Relevance & Risks in Welding
This process minimizes spatter and increases weld precision. It also reduces the risk of hot cracking, as it enables controlled heat transfer. However, a wrong current switch or an inaccurate droplet duration can lead to an uneven weld and reduced mechanical properties.
Workshop Practice & Instructions
Use a pulsed arc welder with correctly set background and pulse currents. The droplet duration should be between 10 and 20 milliseconds, depending on the material type and weld thickness. Make sure the electrode is clean and that you get good feed of the material. A too long droplet duration can lead to spatter, while a too short duration results in incomplete joints.