What does the term "deposited metal" refer to in MIG welding?

The term "deposited metal" in MIG welding specifically refers to the filler metal that is added during the welding process. This filler metal, which is typically supplied in the form of a spool of wire, melts and integrates with the base metal as the weld is made. The purpose of the filler metal is to ensure that a strong, cohesive joint is formed between the base metals being welded. It contributes to the overall strength and integrity of the weld.

In MIG welding, the process involves feeding the filler metal wire through a welding gun, where it is melted by the heat of the arc established between the wire and the base metal. This molten filler metal then solidifies with the base materials as they cool, creating what is referred to as the deposited metal. Understanding this term is crucial for welders, as it directly relates to considerations such as the choice of filler material and its compatibility with the base metal for a successful weld.