Fylltråd

Fylltråd, often translated as filler wire or welding wire, is a consumable material used in various welding processes, most notably in gas metal arc welding (GMAW), also known as MIG welding, and flux-cored arc welding (FCAW). Its primary function is to melt and join two or more pieces of metal together, forming a solid and continuous weld.

The composition of fylltråd varies greatly depending on the base metals being joined and the desired properties of the weld. Common materials include steel alloys, stainless steel, aluminum, and copper alloys. It is typically supplied in spools and fed automatically through the welding gun.

In GMAW, fylltråd is typically a solid wire that melts as it passes through an electric arc, with a shielding gas protecting the molten pool from atmospheric contamination. In FCAW, the fylltråd has a tubular core filled with fluxing agents. This flux can provide shielding, introduce alloying elements, and help remove impurities from the weld.

The diameter of the fylltråd is a critical parameter, influencing the heat input, penetration, and overall appearance of the weld. Larger diameter wires are generally used for thicker materials and higher deposition rates, while smaller diameter wires are suitable for thinner materials and more precise welding. Selecting the correct type and diameter of fylltråd is essential for achieving strong, defect-free welds.