Capacitor Discharge (CD) Weld Studs


Product Overview

Capacitor Discharge (CD) Weld Studs

Capacitor Discharge (CD) stud welding is used to weld small diameter studs to thin base materials such as mild steel, stainless steel or aluminium. The capacitor discharge welding process operates on the principle that the energy stored in a capacitor battery is discharged within between 1 and 3 milliseconds through the ignition pip of the part being welded. In view of the fact that the welding process is completed instantaneously, welds can be made without evident distortion, burn-through or reverse side discolouration.


How does CD Stud Welding work?


  • The weld stud is positioned against the parent material.

  • The energy stored in the capacitor battery is discharged through the stud, melting the full diameter of its base and a section of the parent material.

  • Spring-loading forces the stud into the molten metal.

  • The stud is held in position as the molten metal solidifies and instantly creates a high quality fusion weld.


CD stud welding eliminates secondary operations by removing the need for pre-drilled or pre-tapped holes. CD stud welding can also reduce costs through offering savings to labour and material expenditure. 


Almost any metal can be adapted to CD stud welding. Aluminium, mild and stainless steel, copper, brass, and zinc are the most common metals used.


Lancaster Fastener's CD Weld Studs are available in a variety of forms, all conforming to DIN EN ISO 13918


  • Type PT (Threaded) - Copper Coated, A2 Stainless Steel, Aluminium

  • Type UT (Unthreaded) - Copper Coated, A2 Stainless Steel

  • Type IT (Internally Threaded) - Copper Coated

  • Type CT (Coarse Threaded) - Copper Coated



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