GMAW Pulsed Arc Frequency
MIG pulsed arc frequency is the number of current changes between background and pulse current per second. It precisely controls metal transfer.
Physical-Chemical Mechanism of Action
The MIG pulsed arc frequency controls the interaction between the electrode and the workpiece through periodic current changes. With each pulse duration, a small metal droplet is detached, which then falls onto the workpiece.
Metallurgical Relevance & Risks in Welding
A frequency that is too high can lead to irregular droplet transfer and porosity. A frequency that is too low causes overly slow transitions and increases the risk of hot cracking. The optimal frequency varies depending on the steel type and material thickness.
Workshop Practice & Instructions
For common steel types such as DIN 1.0035 (steel disc), a pulsed arc frequency of 20 to 40 Hz is recommended. For thinner materials (≤ 6 mm), a frequency of 30 to 50 Hz is suitable, and for thicker materials (> 10 mm), 20 to 30 Hz. Always monitor the droplet size and the surface quality of the weld.