What are the different types of spot welders available?
There are two kinds of spot welders on the US market today. The first type is an AC power unit with electric transformer built directly to a welding gun. The large suspended welder has an overhead boom and is liquid cooled. The second type is a DC-power unit with 7-10 ft. welding cables. The cables are connected to the welding gun. The gun can be manual or air operated to squeeze the welding tips together. Forced air is used to cool the welding cables and its pneumatic spot gun. Welding gun and AC transformer in one unit. AC power welders can perform double-sided welding and their reach can be increased by using 10 to 24 inch extension welding u-arms. Using such an extension, a rear body panel can be, for instance, welded to the lower flange. The large G-type pneumatic spot gun has an L-shaped tip/arm and a straight tip is held in the plunger. Due to the size and weight a larger spot gun weights 70 lbs. Due to its heavy weight it is always operated with an overhead boom and a wire to a
