Stud welding
with shielding gas

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.

Step 1

The stud is placed against the workpiece.

Step 2

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

Step 3

The arc melts the surfaces of stud and workpiece.

Step 4

The stud is plunged into the weld pool.

Step 5

A cross-sectional joint is achived.

Process Stud welding with shielding gas
Minimum sheet thickness t 1/8 d
Maximum stud diameter d for welding from different positions 12(16)  ↓
  6  ←
  8  ↑
Suitable surface conditions¹) bright metal, rolling skin, primer suitable for welding, surface rust, thin layer of oil, zinc coating
Unsuitable surface conditions¹) loose layers of scaling, heavily corroded, protective coating
Common applications studs from M 6 to M 12 in downhand position, especially with automatic feeding of studs
¹) Here, we can give only general hints without any commitment or warranty on our part. The conditions must be tested in each individual case. Basically, a higher degree of surface cleanliness is required for shorter welding times. The best results are always achieved on bright metal surfaces.