Tru-Weld TWE250 CD Welder - Manual (Page 5)

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The complete range of the capacitor discharge equipment is compact, portable stud
welding equipment. The units are specifically designed to enable a small diameter
range of ferrous and nonferrous weld studs to be welded to light gauge metal materi‐
als with little or no reverse‐side marking.
The equipment consists of a control unit, a welding hand gun, and all necessary inter‐
connecting cables.
THE PROCESS
Capacitor Discharge (CD) stud welding is a form of welding in which the energy re‐
quired for the welding process is derived from a bank of charged capacitors. This
stored energy is discharged at the base of the specially designed CD stud and it fuses
the stud to the base material. The time of the weld is determined in such a short du‐
ration that no burn through marking is made on the finish side of the material.
CONTACT
In contact CD welding, the stud is placed under spring pressure on the material to be
welded. When the capacitors are discharged, the special tip of the CD stud melts and
the spring pressure forces the stud to fuse with the base material.
INTRODUCTION