INTRODUCTION
INTRODUCTION
The complete range of DABOTEK ApS Capacitor Discharge units
are compact, portable Stud Welding equipment's. The units are spe-
cifically designed to enable a small diameter range of ferrous and
non
-
ferrous weld studs to be welded to light gauge, self
-
finish or
pre
-
coated materials, in most cases with little or no reverse marking.
The equipment consists of a control unit, a welding pistol and
the necessary interconnecting cables and accessories (see page 4 for
the equipment schedule).
THE PROCESS
Capacitor Discharge stud welding is a form of welding in which
the energy required for the welding process is derived from a bank
of charged capacitors. This stored energy is discharged across the
gap between the two surfaces to be welded as they are propelled
towards each other. The arc produced heats the two surfaces, melt-
ing a thin film of metal on each surface and the propelling force
closes the gap between the two faces, thus forming a weld.
In contact welding the stud to be welded is forced by spring
pressure on to the plate. At this point the arc gap between the two
components is maintained by a small pip on the welding face of the
stud. On initiation of the high current pulse from the capacitors, this
pip vaporises and an arc is drawn between the work piece and the
stud. The heat from this arc melts the base of the stud and the area
of the work piece directly beneath the stud, whilst the spring pres-
sure from the pistol accelerates the towards the work piece. Within
3 to 4 milliseconds the stud hits the work piece and the arc is extin-
guished. The kinetic energy contained in the moving stud and the
remaining spring pressure, forge the molten parts together to form
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