Arc discharge type stud welding gun

The utility model discloses an arcing type stud welding gun which comprises a shell, a handle, a conductive end group, a conductive gripping head, an insulating stool, an electromagnet, a control wire and a cable, wherein the insulating stool is fixed on the front part of the shell, the electromagnet is fixed in the shell, and the conductive gripping head is fixed on the front end of the conductive end group; the front part of the conductive end group is supported by a sliding bearing arranged in the insulating stool, the rear part of the conductive end group is supported by a sliding bearing arranged in the electromagnet, the rear part of the conductive end group is provided with an armature of the electromagnet, and a spacing washer made from non-magnetic materials is arranged between the armature and the electromagnet. The conductive end group is lifted after the electromagnet is energized so as to drive welding nails positioned in the conductive gripping head to leave from a welding plate, and an electric arc is generated between the welding plate and the welding nails to form a molten pool. When the electromagnet is interrupted, the spacing washer made from non- magnetic materials reduces the attractive force of the remanence of the electromagnet for the armature, and the welding nails can be rapidly pressed into the molten pool by the conductive end group under the pressure action of a pressure spring, thereby the welding quality of the welding nails is ensured.