Forge welding may be the oldest known welding process which is practiced since way back when. The procedure is still used although its application is fixed because of the certain complexity associated with it.
Metals that may be Forge Welded:
Wrought iron and low carbon steels (with C content lower than 0.2%) could be acceptable forge welded. Forge welding might be accepted out with metal thicknesses approximately about 30 mm.
Surfaces of the metal parts to be forge welded are prepared by upsetting the pieces at the ends. A variety of edge preparations necessary to be carried out previous to forge welding.
Procedure for Forge welding:
The parts to be forge welded are given an edge (or joint) preparation as clarified above. Then, the parts are heated to over l000°C until they are plastic. In this state, the parts are positioned on the anvil end to end and are hammered jointly, either using a power hammer or physically, until they form a solid structure of metal.
In forge welding process, a very significant requirement is that during heating the absorption of sulphur from the coke of the fire and scaling of the pieces (to be welded) ought to be prevented or that if scale is created, the hammering should be completed in such a way as to squeeze this out of the joint and allow metal to metal contact. Besides being combined by blows from a hammer, the work¬ pieces may also be welded by being rolled, drawn or squeezed together.