MIG Welder

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The Millermatic 210

Make: Miller Electric

Model: Millermatic 210

Ace: Wyatt Bertis (wbertis22@georgefox.edu).

Location: Welding Shop


The Millermatic 210 is a wire feed metal inert gas (MIG) welder that is meant for light industrial use. Metal inert gas is a welding process in which an electric arc forms between a consumable MIG wire electrode and the base metal, which heats the base metal, causing them to melt and join. Along with the wire electrode, a shielding gas feeds through the welding torch, which shields the process from contaminants in the air. This is the easiest and most common type of welding which makes it perfect for those learning to weld. It uses 72/25 CO2 and Argon gas mixture to shield the molten weld from oxygen. If the weld pool is exposed to oxygen, it can create a handful of problems such as porosity and excessive spatter in the bead. This welder is capable of welding carbon steel as well as stainless steel. Below is a short video explaining MIG welding. Before completing the training on this machine you must complete the Virtual Reality Welding Station training and spend some time practicing with it to get a feel for the welding process. This purpose of this wiki is to explain the operation of the Millermatic 210 not the actual welding technique which is learned on the VR Welder.



  • MIG Welding - Metal inert gas is a welding process in which an electric arc forms between a consumable MIG wire electrode and the base metal, which heats the base metal, causing them to melt and join. Along with the wire electrode, a shielding gas feeds through the welding torch, which shields the process from contaminants in the air.
  • Weld Metal/Electrode - The metal added to the base metal to create a weld.
  • Torch - The piece that is held while welding and feeds the weld metal into the base metal.
  • Base metal - The metal pieces that are being joined together.
  • Coupons - Small pieces of metal used to practice welding.

User Manual



MIG welding may be the simplest welding method to use but that does not mean it is easy.


Perform several weld lines and one of lap, butt, or Tee joint welds. These should be performed on the coupons found in the weld shop. See the image below to see the different types of welds.

Weld Types.png

General Procedure

Prior to Welding:

  1. Place the fume hood over the area you will be welding and make sure it is on. The power switch is located on the wall next to the door and light switch.
  2. Attach the ground clamp to the metal bench your work piece will be on. Ideally, place the ground clamp on the base metal itself to create the smoothest path for the electrical current.
  3. Ensure the work piece is touching the conductive surface of the table. This is critical if the clamp is not touching the base metal.
  4. Ensure the adjusting screw on the tank regulator is loose (Do not unscrew all the way).
  5. Slowly open cylinder valve all the way. Suddenly opening the valve could cause damage to the regulator.
  6. Slowly turn the adjusting screw (clockwise) to increase pressure to 15 CFH. At first it will spin freely but you will begin to feel resistance as the pressure begins to increase on the leftmost pressure gauge.
  7. Identify the material type and thickness that you will be welding.
  8. Determine the wire feed rate and voltage to fit your material and wire size. To do this, refer to MIG welding chart for specified adjustments specific to your application. A welding chart is included below for reference and the same chart is mounted inside the cover of the welder.
    Welding Chart.png
  9. Turn on the welder and adjust wire speed and voltage to match the parameters layed out by the welding chart. Refer to the image below to see the controls for doing this.
    MIG Controls.png
  10. Ensure you are wearing all necessary protective gear. This should include closed shoes, pants, a welding coat, a welding helmet, and welding gloves. There should be no skin exposed to the welding arc or it will cause burns.
  11. Ensure the welding torch has proper amount of wire protruding from tip (about ¼ inch) and that the torch nozzle is clean of any debris. You can use pliers to scrape off any debris in the nozzle. If too long, trim excess with the welding pliers. If to short, pull the trigger while the torch is not in contact with anything and more wire will be fed out.

Perform a Weld:

  1. Set up the work pieces in your desired configuration. Magnets and metal clamps are helpful for doing this and can be found on the tray below the tabletop.
  2. Tack the pieces together in a few places by holding the torch at the proper angle and holding down the trigger for 2-3 seconds. Before pulling the trigger make sure to say "welding" to let everyone in the room know you are about to start. If you do not know the correct angle to hold the torch go practice some more on the Virtual Reality Welding Station until you are comfortable with the torch.
  3. Perform as many welds as needed. If you are doing everything right the noise should sound like sizzling bacon. Also, you may need to periodically trim the wire between welds to keep the correct distance from the work piece.

After Welding

  1. Close gas cylinder valve.
  2. Bleed any remaining gas by depressing trigger until regulator drops to 0. Make sure the torch is not in contact with anything while doing this.
  3. Back out adjusting screw on regulator (Do Not unscrew all the way).
  4. Turn off the welder.
  5. Remove the ground clamp and clean up any scraps and slag from the work area.


  • Touching live electrical parts can cause fatal shocks or severe burns. The electrode and work circuit is electrically live whenever the output is on. The input power circuit and machine internal circuits are also live when power is on. In semiautomatic or automatic wire welding, the wire, wire reel, drive roll housing, and all metal parts touching the welding wire are electrically live.
  • Don’t weld lead, zinc, copper, cadmium, stainless, or beryllium. Welding these materials can be harmful if not equipped with proper safety gear and training.  
  • Don’t weld in wet gear or standing water because this could create a new path for the electrical current to travel and cause a severe electrical shock.
  • Always turn gas and the welder off when you are done in the welding shop to ensure there are no leaks that could cause asphyxiation (suffocating from lack of oxygen).
  • Never weld without a welding helmet. 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.
  • Never weld without gloves. Gloves protect your hands from the heat as well as the arc rays.
  • Don't weld with the vent hood off. Welding produces fumes and gases. Breathing these fumes and gases can be hazardous to your health. Asphyxiation can also occur due to the confined nature of the welding shop and the use of welding gasses.
  • Always weld with the door open to lower the risk of asphyxiation.
  • Don't weld with the gas off. This can damage the machine.
  • Don’t unscrew valve adjusting screw all the way out. This could damage the valve.
  • Please avoid touching the hot metal surrounding the weld, even if you are wearing welding gloves. You could get burned and the heat may damage the gloves.


Foxtale Quiz



General maintenance

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Specific Maintenance Tasks

Maintenance Procedure Frequency Done By
Sample Sample Sample