Cutlass Fasteners Signus PHM-1A Manual - Page 4

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Cutlass Fasteners Signus PHM-1A Manual
PHM-1A GAP CD WELD GUN MANUAL
The SIGNUS CD stud welding system consists of the power unit (LBS-075), ground cables,
welding gun (PHM -1A), a suitable chuck (collet) and welding stud.
The PHM-1A is a GAP welding gun for welding studs with ignition tips. Due to the very short
welding time (compared to contact CD welding) the PHM-1A is ideal for welding to very thin
work pieces and allows welding to Aluminum without inert gas.
With the recommended settings shown on pages 9 and 10, other materials can also be
welded.
THE GAP CAPACITOR DISCHARGE STUD WELDING PROCESS
A stud is first pushed into the weld chuck or collet. The gun is then placed in a vertical position on the
workpiece. When the trigger button is pressed the gun automatically lifts the stud off the surface. When
the maximum set lift is achieved the lifting solenoid is turned off and the welding current is switched on.
The spring in the gun forces the stud towards the workpiece.
When the ignition tip hits the workpiece surface, a very high current is discharged. This vaporizes the
ignition tip and an arc is generated which melts the face of the stud and an approximately equal area of
the workpiece. The stud then dips into the molten weld pool, the arc is extinguished and the weld pool
solidifies. The welding process lasts about 1-3 milliseconds.
The weld gun is pulled off the weld stud. The SIGNUS recharges and a new stud can be fitted in the
weld chuck and the weld sequence repeated.
The higher the lift setting, the shorter the weld time (see the chart on page 9 for suggested settings). It
is recommended that the workpiece is 0.020" (0.5mm) minimum thickness.
COPYRIGHT CFI 2009
Cutlass Fasteners, Inc.
83 Vermont Ave., Unit 6, Warwick, RI 02888
Tel: (401) 732-6333 Fax: (401) 732-6336
cutlass-studwelding.com
email:
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