Spot Welding Machines

Spot Welding machines use a method called resistance spot welding to join overlapping metals between two electrodes using electrical resistance. Squeezing the workpieces between the electrodes applies pressure, and the passage of welding current through the resistive metals generates heat. Tack welding forms a temporary pre-weld, whereas spot welding is a method used to fuse two metals together permanently. Tack welding uses filler material when joining metal pieces, whereas spot welding is carried out through a combination of electrical current and pressure being applied to the metals being fused.There're two type of tack-welds as defined in below: + Temporary: some yard make the temporary fit-up condition with un-qualified welder (fitter), thus the tack-weld will be removed later. + Incorporated: the tack-weld will not be removed after finish the tack.