Welding stud

Details of our welding technology

The process „drawn arc stud welding with shielding gas“ is used for welding studs of a diameter of 3 to 12 mm ( 16mm). In general, the positive pole of the power-source is connected to the workpiece. The stud will be inserted into the chuck of the stud welding gun and positioned onto the workpiece, possibly by adding a ceramic ferrule.

Initiating the welding process: by means of a lifting mechanism, the stud will be lifted and at first an auxiliary arc (pilot arc) of a low current will be drawn. Then the main arc will be drawn between the tip of the stud and the workpiece. The main arc of a high amperage must be adjusted to the diameter of the stud. The cross sectional area of the stud and the opposite workpiece a partially melting.

After the lapse of the adjusted welding time, the stud is moved towards the work piece and both melting zones join tightly. The power-source turns off, the melting zone solidifies and cools down.

In order to obtain a good gas-protection, an adequate appliance is indispensable. At the upper part of the chuck, the gas chamber should be sealed by means of a rubber sleeve.
Down at the workpiece, lateral slotts are required to allow the gas to escape.

The use of appropriate shielding gas is of great importance: mild steel and stainless steel: 82% Ar  and 18% Co2, for aluminium; pure Argon or Ar and He.

Welding stud

Step 1

The stud is placed against the workpiece.

Stud welding process

Step 2

The stud is lifted off, while current is flowing, thus creating an arc.

Stud welding process

Step 3

The arc melts the surfaces of stud and workpiece.

Stud welding process

Step 4

The stud is plunged into the weld pool.

Welded stud

Step 5

The stud is plunged into the weld pool.

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