You are here

Butt welding

Joining process of two wires or rods by heat created by a contact resistance between the workpieces.

Illustration of Butt welding

The process

Two wires or bars [1] are connected to an external power source, with the result that the two workpieces act as electrodes. The ends are pressed together and contact resistance generated due to the current results in that the temperature increases sharply at the contact point [2] and that the material melts. The power is cut and the ends are fused, the joint part is cooled, and the processing is finished.

Finishing in the form of grinding can be applied in cases where a small weld is desired. Note that this is dependent on the thickness of the workpiece and thin material thicknesses can be difficult to grind.