Butt-weld is a well-known term in the world of welding, which refers to the process of joining two pieces of metal by welding them at their butt ends. However, there are several other synonyms for the term that have the same meaning. They include fusion welding, resistance welding, arc welding, and gas welding. Each of these welding techniques requires different tools and methods but has the same purpose of joining metal pieces. However, butt-weld is the most commonly used term and widely accepted across industries. Regardless of the term used, the quality of the welding is the most crucial factor to make sure the joined metals are secure and durable.