1. A stud is welded by means
of a direct discharge of a capacitor battery with high capacitance.
2. Ignition of the arc--caused
by discharging of the energy-storing capacitors-- first of all concentrates
on the ignition tip which vaporizes.
3. The arc melts the entire
face of the flange and the surface of the parent material opposite the
5. The arc is extinguished
and the capacitors are completely discharged.
6. A uniform cross-sectional
fusion of stud and parent material is achieved.
7. Weld cycle amounts to
only 1 to 3 ms.
8. Hand-held guns move the
stud forward mechanically by spring pressure.