Studfast Studwelding Ltd, 1 Low Farm Place, Moulton Park, Northampton, NN3 6HY         Tel:  01604 790901  Fax: 01604 492946

Capacitor Discharge (CD) Studwelding

Capacitor Discharge stud welding Process


Energy is stored in a bank of capacitors, which are charged to a pre-set voltage, determined by the type and size of stud and the parent material.
When triggered, the energy discharges as a high current pulse, melting the pip to produce an arc. Spring pressure forges the stud onto the molten surface to ensure complete fusion across the flange.

The weld duration is less than 4 milliseconds.

This process is ideal for use on thin gauge cold rolled sheet where reverse marking can be minimised or eradicated. Penetration into the parent material is minimal.

To use CD Studwelding, the parent material must be clean and flat. The sheet may be Mild Steel, Stainless Steel, Aluminium Alloy, Pure Aluminium or Lead Free Brass.

Stud sizes:                  M2.5 – M10
Sheet Thickness :        0.7mm min

CD Studwelding controllers are lightweight & hand portable. They are lower cost than either the Drawn Arc or Short Cycle equipment and they run from single phase 230/110Volt 50 Hz supply.

The advantages of this process are:

  • Low Cost Studs
  • Low Cost Equipment
  • Fastest Process
  • Easy to Jig
  • No Gas required
  • Clean Welds, NO finishing
  • Ideal for Production Systems; e.g CNC, auto stud feed


Click here to download the CD Weldability Data Sheet.
Click here to download the Weld Torques and Material Compatibility Sheet.

Click here to return to Processes.

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