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. 1




The Millermatic 211 is both a stick welder and a MIG welder, see sister Stick Welding Guide UG 130-02 and Maintenance Guide MT 130-02

Millermatic 211 Stick and MIG Welder.png


  • Always wear approved face shield while operating the welder.
  • Wear a welder helmet that fits your head, face and neck comfortably. It should cover the top of your head down to where your head and neck meet. Those with a mask that lifts are helpful because they let you take a peek at your work, but you may want an auto-darkening helmet too that comes with shields designed for different jobs.
  • Wear approved welder’s gloves and jacket.
  • Wear dry, hole-free insulating gloves and body 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.
  • Non-slip footwear or anti-skid floor strips are recommended.
  • 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.
  • Insulate work clamp when not connected to workpiece to prevent contact with any metal object.
  • 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.
  • To handle hot parts, use proper tools and/or wear heavy, insulated welding gloves and clothing to prevent burns.
  • 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.
  • 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 safety glasses with side shields under your helmet.
  • Use protective screens or barriers to protect others from flash, glare and sparks; warn others not to watch the arc.
  • Wear protective clothing made from durable, flame-resistant material (leather, heavy cotton, or wool) and foot protection.



For general instruction, see Stick Welding Guide UG 130-02[File:https://vector-space.org/wiki/Stick_Welding_User_Guide]

MIG Change Polarity.png

4-13 Removing MIG Gun From Welding Power Source.png

4-14 Connecting Spool Gun To Millermatic 211.png

4-14-1 Connecting Spool Gun To Millermatic 211.png

5-1 MIG Controls.png

5-1-1 MIG Controls.png

MIG Process Connections.png

8-2 Typical MIG Process Control Settings.png

8-2-1 Typical MIG Process Control Settings.png

8-16 MIG Shielding Gases.png

Shielding Gas Bottle – make sure it is always chained up, either to the machine or somewhere in the shop. If it falls over with a regulator on it, the gas will try to escape and the gas stream could potentially hurt someone. To prevent the escape of gas when not in use, remove the regulator and fasten a threaded protector cap to the top of the bottle to keep the valve system safe and help prevent a rupture.



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