MIG

MIG welding (also known as GMAW or wire welding) is one of the most popular forms of welding. It is mainly used in high production projects where speed is a factor.

• MIG = Metal Inert Gas

• GMAW = Gas Metal Arc Welding

• Always DC current. DCEP usually for steel and always for aluminum.

• Often constant potential (CP/CV) machines used.

• High deposition rate

• 92% - 98% filler metal forms weld deposit. 

• Concentrates more current at one point than SMAW arc, producing deeper penetration.

• Less heat input per linear inch of weld.

• Suited to welding low carbon structural steels, low alloy stainless steels and hardsurfacing.

• Penetration is highest when doing globular transfer.

• Spray transfer requires a minimum of 80% argon and only on DCEP. 

• Longer stickout = voltage increases/current decreases 

• Shorter stickout = voltage decreases/current increases

• Inductance controls the rate of current rise. 

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