Why is energy storage welding suitable for sheet welding, while thick plate is suitable for tensile arc welding

In most cases, energy storage stud welding is suitable for welding on thin plates, and draw-arc stud welding is suitable for welding on thick plates.
The energy storage stud welding is characterized by high current (several thousand A) and short time (1-3 ms), so the weld pool is shallow and the welding deformation is small.
But at this time the welding strength is still relatively large (welding strength > stud itself strength > sheet itself strength, or welding strength > sheet itself strength > stud itself strength), so the first yield is the stud (bending or breaking) or the sheet (tearing).
If the energy storage stud welding is used on a thick plate, then the strength of the plate itself is the greatest, because it is almost impossible to tear, then the first yielding may be the stud (the stud diameter is small, but it is rare to weld small diameter studs on the thick plate) or the welded joint.
Another reason is that energy storage stud welding cannot be welded on hot rolled plates (thicker oxide skin exists), and thick plates are in most cases hot rolled plates.
The current of pull-arc stud welding is relatively small (500-1500A), but the welding time is longer (5-2000 ms), so the weld pool is deeper and the welding deformation is larger.
If the welding sheet is easy to cause penetration (welding large diameter studs), the minimum plate thickness is generally required to be 1/4 of the diameter of the stud.
The deeper molten pool makes the welding strength always greater than the strength of the stud itself, so the first yield in the destructive test is always the stud or sheet.