Capacitor Discharge Stud Welding
Capacitor discharge stud welding is a short-time arc welding process where energy is discharged from a capacitor bank. The short burn time minimizes thermal influences and allows welding onto thin sheets.
Physico-chemical mechanism of action
Energy is released from a capacitor bank in milliseconds, leading to a rapid arc. This melts the stud base and the sheet surface very quickly.
Metallurgical relevance & risks when welding
The short burn-off time minimizes thermal effects on the base material, resulting in low distortion and minimal deformation. However, a missing discharge volume can lead to insufficient melting and poor weld quality.
Workshop practice & instructions
Use a capacitor bank with sufficient capacity. Make sure the discharge volume is set correctly (usually 5-10 mm³). The burn-off time should be between 2 and 4 ms. Ensure a clean surface of the stud and the sheet.