In most cases, energy-storage stud welding is suitable for welding on thin plates, and arc-type stud welding is suitable for welding on thick plates.
Energy-storage stud welding is characterized by high current (thousands of a) short time (1-3 ms), so the melting pool is shallow, welding deformation is also small.
But at this time the welding strength is still relatively large (welding strength > The strength of the column itself > The strength of the plate itself, or welding strength > The strength of the plate itself > The strength of the stud itself), so, the first yield is the stud (bent or fractured) or plate (tear).
If energy-storage stud welding is used on thick plates, then the strength of the plate itself is the largest, because it is almost impossible to tear, then the first yield may be the stud (when the stud diameter is small, but rarely on the thick plate to weld small diameter stud) or welded joints.
Another reason is that energy storage stud welding can not be welded on hot-rolled plate (thicker oxide skin exists), and thick plate is in most cases hot-rolled plate.
The current of Arc screw welding is relatively small (500-1500A), but the welding time is longer (5-2000 ms), so the melting pool is deeper and the welding deformation is larger.
Deeper melting pool If the welded sheet is easy to cause penetration (when welding large diameter stud), the minimum plate thickness is generally required to be 1/4 of the diameter of the stud. The deeper melting pool makes the welding strength always greater than the strength of the stud itself, so it is always the stud or plate that succumbs first in destructive experiments.
