Practical cold welding is a method of joining two metal surfaces together without the application of heat or pressure.

Practical cold welding is a method of joining two metal surfaces together without the application of heat or pressure. It takes place at low temperatures and high pressures. It is used to join metal parts with very similar properties. This process is known as “cold” welding because no heat is applied to the metal, unlike hot welding where heat is applied to soften the metal. Cold welding can be done using a variety of techniques, but the most common method is the use of pressure and a filler material.

The basic steps for this process are as follows:
The surfaces of the metal parts to be joined must be cleaned. Any dirt, oil or other contaminants must be removed to ensure a proper weld.
Align the two metal parts to be joined. The parts must be positioned so that the surfaces to be welded are in contact with each other.
The parts must be pressurized. This can be done using a press or a hammer, depending on the size and type of parts being welded.
Apply a filling material. This can be a wire, powder or putty that will fill the gaps between the parts and provide a stronger bond.
Keep the parts under pressure for some time. The time required will depend on the size and thickness of the parts being welded.
Release the pressure and allow the weld to cool.
It is important to note that this method is typically only used to weld metals with very similar properties, as dissimilar metals may not bond well. In addition, certain types of metal can be brittle, so cold welding can only be used in applications where the metal itself can withstand the pressure required to join it.
It is also important to have the right equipment and good knowledge of metal properties to avoid risks of deformation, cracking or poor metallurgical properties of the joint.