Abstract
Steel pipe may be welded to steel plate at right angle by using the electrolytic capacitor type spot welder. Maximum storing energy of this welder is about 15 k joules, and total capacitance of the electrolytic capacitors is 125, 000μF. Mechanical force to the tip electrode is variable from 850 kg to 3000 kg.
For the steel pipe 19.8 mm in diameter, 1.2 mm in thickness, 40 mm in length, weld time should be selected as short as about 3 m sec, and welding energy as large as about 4.8 k joules to obtain a good weld.
By observing oscillograms of current and voltage during this welding, it is found that weld starts at about 8×104 sec after the switchin and finishes at about 102 sec.
