Metal

Millermatic 211 MIG Welder

Manufacturer:  Miller

Millermatic 211 MIG Welder

Millermatic 211 MIG Welder

Model:  211

Description:  Gas Metal Arc Welding (GMAW), also known as MIG (Metal Inert Gas) is an arc welding process in which a consumable, continuous wire electrode is automatically fed through a welding gun in the presence of a shielding gas. It was originally developed in the 1940s for welding aluminum and other non ferrous metals. It has since gained widespread popularity for welding of steel, due to faster process times compared to conventional “stick” welding.

For ferrous metal welding an inert gas (often Argon, Helium, CO2 or other mixture) shields an electrical arc that is created between a thin wire electrode and the material being welded. The heat of the arc melts both the base metal to be joined and the electrode. The current flow from the electrode to the work helps to deposit the molten electrode in the weld area. At the same time the wire electrode is automatically fed from a spool at a sufficient rate to maintain proper electrode length as it is consumed.

The inert gas forcibly expels atmospheric oxygen from the weld area, preventing the formation of undesirable compounds  in the weld that might otherwise be catalyzed by the high heat and current of the process.

The high rate of filler deposition makes GMAW an excellent choice for high load structural weld applications. Additionally the current-following nature of the filler material simplifies the production of vertical, overhead and other out of position welds.

Specifics of our system:

Millermatic 211 MIG, with auto-set.

Power input:  230V.

Shielding gas:  75% Argon, 25% CO2

Typical wire:  0.030”  ER70S (range is 0.024” – 0.035”)

Typical setup:  DCEP (direct current electrode positive, for gas-shielded, i.e., GMAW)

Rated output:  150A at 30% duty cycle.  30-210A range.

Wire feed speed range:  60-440 IPM.

Capacity:  24 gauge to 3/8”

Aluminum:  using spoolgun accessory

Benefits

Fast–some folks call MIG welders a “hot glue gun for metal”.  Easier to use than TIG.  Quick to set up and use.

Limitations

Must change out filler wire for materials other than mild steel.  For beginners, not as nice/clean welds as TIG.

Materials

Mild steel.  (Other materials such as stainless, aluminum, with special accessories.)