What is the purpose of using a contact tip in MIG welding?

The purpose of using a contact tip in MIG welding is to maintain electrical conductivity. The contact tip is a crucial component that connects the welding power supply to the electrode wire. Its primary function is to conduct the electrical current that is necessary to create the electric arc between the welding wire and the workpiece. This arc generates the heat required to melt both the filler material (the welding wire) and the base material being welded.

Good electrical conductivity is essential for achieving a stable arc and an efficient welding process. If the contact tip does not maintain proper conductivity, it can lead to erratic arc behavior, inconsistent weld penetration, and overall poor weld quality. Therefore, ensuring that the contact tip is properly maintained and functioning is vital for successful MIG welding operations.