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MIG welding is one of the most widely used welding processes in the world — accounting for more than 50% of all welded metal produced globally. Its combination of versatility, speed, ease of use, and suitability for automation has made it the standard process across automotive manufacturing, structural fabrication, shipbuilding, and general engineering. This guide explains what MIG welding is, how it works, the different metal transfer modes, key components, and the advantages and limitations of the process.
MIG welding (Metal Inert Gas welding) is an arc welding process that fuses metals together using a continuously fed consumable wire electrode shielded by an inert gas. It is one of two sub-types of Gas Metal Arc Welding (GMAW) — the other being Metal Active Gas (MAG) welding. The distinction comes from the type of shielding gas used: inert gas (such as argon) for MIG, active gas (such as CO₂ or argon/CO₂ mixtures) for MAG. The process and equipment are otherwise the same. The choice of shielding gas depends on the metals being welded and the transfer mode being used.
MIG welding was developed in 1948 by the Battelle Memorial Institute and patented in 1949. In the decades since, advances in power source technology — particularly pulse MIG and synergic control — have significantly extended its capability and range of applications.
MIG welding works on almost all conductive metals, including mild steel, stainless steel, aluminium, copper, magnesium, bronze, and nickel alloys. It is suitable for most material thicknesses — from thin sheet through to heavy plate — although the transfer mode, filler metal, and shielding gas must be matched to the material and thickness. For aluminium-specific MIG welding guidance, see our article on aluminium MIG troubleshooting and our aluminium filler alloy selection guide.
When the torch trigger is pressed, three things happen simultaneously:
The joint is formed as the weld pool solidifies — a mixture of the filler wire and the melted base material. The operator moves the torch along the joint at a controlled travel speed, depositing the weld bead. The quality of the result depends on the correct combination of wire feed speed, voltage, travel speed, torch angle, and shielding gas selection.
The method by which the filler wire is transferred into the weld pool varies with voltage, current, shielding gas, and wire diameter. The transfer mode directly affects penetration profile, spatter level, positional capability, and material thickness range. There are four principal transfer modes:
The wire feed speed is set so that the wire physically touches the weld pool, creating a short circuit that melts the wire tip and deposits metal in the pool. This cycle repeats 20–200 times per second. Short circuit transfer is a low-voltage, low-heat-input method — all positional, and the correct choice for thin materials and positional work where heat input must be minimised. Typical shielding gas is 75–85% argon / CO₂.
A continuous arc is maintained and metal transfers as large droplets — larger in diameter than the wire itself. Globular transfer requires high heat input and produces significant spatter. Because the droplets fall by gravity, it is limited to flat and horizontal positions. Typical shielding gas is pure CO₂, making it the lowest-cost transfer mode, but post-weld cleaning requirements can offset this advantage.
At high voltage (typically above 25 V for 1.2 mm wire) and wire feed speeds giving more than 250 A, the arc burns continuously and metal transfers as a fine spray of small droplets. Spray transfer produces clean, aesthetically good welds with low spatter and good penetration. It is limited to flat and horizontal positions on most materials, though it can be used positionally on aluminium. Typical shielding gas is high-argon mixture (80% Ar or above).
Pulse transfer requires a pulse MIG power source. The output alternates between a background current (which maintains the arc without transferring metal) and a peak current (during which spray transfer occurs). The average current is below the threshold normally required for spray transfer, giving a smaller weld pool that can be controlled in all positions. Pulse MIG produces clean welds with minimal spatter and a reduced heat-affected zone, and is suitable for thin and thick materials alike. Typical shielding gas is argon or high-argon mixture. For heavy industrial applications, see our article on pulse MIG technology in heavy industrial welding.
The wire electrode serves as both the arc source and the filler metal for the joint. It is fed through a copper contact tip in the torch, which conducts current into the wire. Wire diameter typically ranges from 0.8 mm to 1.6 mm depending on the material thickness and transfer mode. The filler metal must be compatible with the base material — generally matching in alloy type — and the mechanical properties of the weld metal should meet or exceed the base material requirements. For filler metal selection guidance, see our welding consumables selection guide. ESAB's OK AristoRod range covers the full spectrum of mild and low-alloy steel MIG wire requirements.
The shielding gas protects the molten weld pool from atmospheric oxygen and nitrogen. The three most common gases are argon, helium, and CO₂, used individually or in mixtures. The correct gas selection depends on the base material, transfer mode, and required weld properties. For detailed shielding gas guidance, see our article on shielding gas management in wire welding. For aluminium, see our article on argon vs helium for aluminium welding.
The MIG torch carries the welding current, wire, and shielding gas to the weld joint. The contact tip guides the wire and conducts the welding current — it is a consumable that requires regular replacement. Nozzle condition, contact tip bore diameter, and liner integrity all directly affect arc stability and weld quality. For torch consumable guidance, see our article on nozzle selection for MIG welding. For heavy industrial applications, ESAB's RobustFeed Edge with the PP 350W Inline Push-Pull torch delivers best-in-class feeding performance for demanding applications.
MIG welding uses a constant-voltage (CV) power source, which maintains a relatively stable arc voltage regardless of variations in arc length. The wire feed speed controls the welding current — faster feed speed gives higher current. Power source selection depends on material thickness, material type, duty cycle requirements, and the transfer modes required. For heavy industrial MIG welding, ESAB's Warrior Edge 500 DX and Aristo 500ix deliver the full range of MIG transfer modes including advanced pulse and SPEED WeldMode. For wire feeding in production environments, see our article on wire feeders in heavy industrial welding.
MIG welding is the primary welding method in global manufacturing — used across automotive production lines, structural fabrication, shipbuilding, pressure vessel manufacture, pipeline welding, and general engineering workshops. Its suitability for automation makes it the dominant process in high-volume production environments, where robotic MIG welding systems deliver consistent quality at speeds and duty cycles that manual welding cannot match.