Introduction of our products



What is a CD Stud?

What is a CD Stud?


An abbreviation for Capactitor Discharge, this is a welding method that charges the capacitor inside the main body from a 100V or 200V power supply and discharges it instantaneously between the stud and the base metal.

CD stud welder

A welding machine that instantaneously welds bolts with protrusions called studs to steel materials, and consists of a CD stud welding machine body, a stud gun, a ground, and a power cable.

What is a CD Stud?

About CD stud welding

  • Conventionally, welding bolts and nuts was a time-consuming job that required skill, but with CD stud welding, you can easily weld by simply pressing the switch on the welding gun.
    Welds bolts and nuts instantly without qualifications, pilot holes, auxiliary materials or gas.
  • Similar or dissimilar metals such as iron, stainless steel, aluminum, copper, and brass can be welded.
  • Because welding is completed in 1/1,000 to 4/1,000 seconds, the heat effect is minimal, making it ideal for the base material of the base plate.
  • Unlike conventional manual welding, there is no need for post-processing such as sanding or removing burns, and because there is no need to drill a pilot hole like clinching, there is no damage to the appearance of the back side.
  • Since work is completed on one side of the base material, there is no need to lift or turn over large or heavy base materials.
  • The welding gun is a compact, lightweight, and portable type.
    You can work in any position, such as upwards, downwards, and sideways.

CD Stud Welding Compatibility Table

Our CD stud welding system can weld not only similar materials but also dissimilar materials.
Please refer to the table below for the combination of materials.

base material stud
mild steel stainless aluminum copper titanium
mild steel
bonde steel
galvanized steel plate

Some products have surface treatment such as painting or plating on the surface of the base material, and some products are incompatible depending on the material. Please check in advance.

Weld strength of CD stud

base material Stud material stud diameter tensile strength shear strength torque
N N・m
Rolled steel plate for general structure
Carbon steel wire
for cold heading
M3 2,156 1,253 1.4
M4 3,500 2,053 3.1
M5 5,880 3,450 6.1
M6 8,722 5,092 10.2
M8 14,700 8,658 22.4
M10 22,246 13,325 45.9
stainless steel plate
Stainless steel wire for cold heading
M3 3,038 1,899 2.3
M4 5,586 3,419 4.7
M5 9,310 5,651 9.2
M6 13,230 7,909 16.3
M8 22,030 14,394 38.8
M10 33,320 22,371 86.7
Aluminum plate
Aluminum wire
pure aluminum
1000 series
M3 588 313 0.4
M4 1,078 588 0.9
M5 1,666 933 1.9
M6 2,352 1,324 3.3

The above strength is the value when the shaft part of the stud breaks.

The strength of the stud varies depending on the material of the stud, the material of the base material, and other conditions.

When designing, be sure to consider an appropriate safety factor and perform a welding test in advance on the base material to be used to confirm strength.