What is used to describe the welding process of joining metals?

The welding process of joining metals can be described by a combination of methods that involve coalescence, which is the process of the metals merging together. Each aspect contributes to various welding techniques and applications.

Coalescence through pressure encompasses methods like forge welding and some forms of resistance welding, where metals are joined primarily by applying pressure without the need for additional heat.

Coalescence through heating refers to processes such as arc welding, where heat is generated through an electrical arc, melting the base metals, and allowing them to fuse together upon cooling. This is critical in ensuring that the joint meets the required structural integrity.

Coalescence with added materials describes welding techniques where filler materials are introduced to aid in the joining of metals. This is common in processes like MIG (Metal Inert Gas) and TIG (Tungsten Inert Gas) welding, where filler rods or wires are melted to create a stronger bond between the two metal pieces.

All these methods represent different aspects of the welding process, which can be used individually or in combination depending on the specific requirements of a given project. Thus, the comprehensive understanding that all these methods contribute to the joining of metals validates that the answer encompasses the entire spectrum of welding processes.