Pulse Frequency
The number of current pulses per second in pulsed welding determines the fineness of the weld ripples and influences the degassing of the weld pool.
Physical-chemical mechanism of action
The pulse frequency determines how often per second a current pulse goes through the material. At each pulse, the metal part is heated and cooled, resulting in fine ripples.
Metallurgical relevance & risks in welding
A high pulse frequency (e.g., 100 Hz) produces a thin, smooth weld ripple and improves degassing of the weld pool, leading to fine-grained structure formation. A low frequency (e.g., 20 Hz) can cause coarser ripples and poorer degassing, risking porosity and cracking.
Workshop practice & instructions
For fine weld ripples and good degassing, choose a pulse frequency of 50 to 100 Hz. For difficult-to-weld materials or high carbon content, a frequency of 20 to 40 Hz may be necessary to better control melting processes.