Robotic MIG/MAG welding: process, gases and wires

MIG/MAG welding is the most widespread continuous-feed arc process in production: a wire is fed continuously and the arc melts the material under a shielding gas atmosphere. Automating it makes sense when joints and positions repeat; the assessment defines the rest.

The process and its variables

Material and thicknesses, gas type, wire diameter, and welding position define the process. Edge preparation and part tolerance matter too: a robotic MIG/MAG is repeatable, but it does not fix a poorly prepared joint. Variables are set per joint and validated with test pieces and real parts.

What the robot contributes

Repeatability of parameters and paths, production continuity, and less operator fatigue. On large parts or long welds, positioners and tracks allow welding in position and keeping the sequence; on assemblies with many joints, multiple robots or stations split the work.

What to validate before quoting

Real samples of the joints, agreed acceptance criteria, fixtures and access, and the welding sequence —which helps manage assembly distortion—. With that on the table, the proposal defines robot, power source, parameters, and peripherals with no hidden assumptions.

Common gases, wires and positions

On carbon steel, robotic MAG cells run 80% argon and 20% CO₂, pure CO₂ or 95% argon and 5% O₂, with 1.0, 1.2 or 1.6 mm solid wire or 1.2 mm flux-cored wire. The robot welds flat, horizontal fillet, horizontal and vertical up or down; as a reference, an 8 mm fillet travels at about 5.5 mm/s horizontally and 1.4 mm/s vertically.

Frequently asked questions