MIG Welding User Guide

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Shop Area: Metal Shop

Tool: MIG Welding

Requires in-person training: Yes 

Procedure Number

UG 130-03, Rev. 2




The MIG welder is used for fusing steel and aluminum. We have Lincoln 350MP MIG welders.

Millermatic 211 Stick and MIG Welder.png


  • Wear an approved welding helmet fitted with a proper shade of filter lenses to protect your face and eyes when welding or watching.
  • Wear approved welding gloves and jacket.
  • Wear protective clothing made from durable, flame-resistant material (leather, heavy cotton, or wool) and foot protection.
  • Before operating equipment, remove tie, rings, watches and other jewelry, and roll sleeves up past the elbows. Remove all loose clothing and confine long hair.
  • Closed toe shoes are required when working in a shop area.
  • Turn off all equipment when not in use.
  • Do not use worn, damaged, undersized, or poorly spliced cables.
  • Do not drape cables over your body.
  • Clamp work cable with good metal-to-metal contact to workpiece or worktable as near the weld as practical.
  • Do not connect more than one electrode or work cable to any single weld output terminal.
  • Do not touch hot parts bare handed.
  • Allow cooling period before working on gun or torch.
  • Keep your head out of the fumes. Do not breathe the fumes. Welding produces fumes and gases. Breathing these fumes and gases can be hazardous to your health.
  • Do not weld on coated metals, such as galvanized, lead, or cadmium plated steel, unless the coating is removed from the weld area, the area is well ventilated, and while wearing an air-supplied respirator. The coatings and any metals containing these elements can give off toxic fumes if welded.
  • Arc rays from the welding process produce intense visible and invisible (ultraviolet and infrared) rays that can burn eyes and skin. Sparks fly off from the weld.
  • Use protective screens or barriers to protect others from flash, glare and sparks; warn others not to watch the arc.



  1. Power on welder.
  2. Open MIG gas bottle and ensure correct flow rate at the regulator.
  3. Set wire speed to Automatic for 0.030" wire, as this is the wire diameter that should be loaded.
  4. Set voltage dial according to the material thickness being welded.
  5. Connect ground clamp to workpiece or work surface.
  6. Ensure proper PPE is in use and safe surroundings.
  7. Weld
  8. When finished, store welding cables properly
  9. Turn off welder
  10. Close gas bottle


8-8 MIG Troubleshooting − Excessive Spatter.png

8-9 MIG Troubleshooting − Porosity.png

8-10 MIG Troubleshooting − Excessive Penetration.png

8-11 MIG Troubleshooting − Lack Of Penetration.png

8-12 MIG Troubleshooting − Incomplete Fusion.png

8-13 - 14 MIG Troubleshooting − Burn-Through and Waviness.png

8-15 MIG Troubleshooting − Distortion.png

                                                      END OF THE PROCEDURE