Taylor CD-i Operating manual - page 7
V‐4J
INTRODUCTION TO STUDWELDING
7
INTRODUCTION
The complete range of Taylor Studwelding Systems Capacitor Discharge units are
compact, portable Stud Welding equipment's. The units are specifically 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 li le or no reverse marking.
The equipment consists of a control unit, a welding pistol and the necessary
interconnec ng cables and accessories.
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, mel ng 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 ini a on 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 pressure from the pistol accelerates the stud towards the work piece. Within 3
to 4 milliseconds the stud hits the work piece and the arc is ex nguished. The kine c
energy contained in the moving stud and the remaining spring pressure, forge the molten
parts together to form a weld.