MIG Welding MIG Welding l MIG Metal Inert

MIG Welding l MIG – Metal Inert Gas, also referred to as GMAW. l

MIG Welding l A semi-automatic welding process using a DC power source, a wire

Advantages of MIG l l l l Faster than arc Smooth bead Easy to

Disadvantages of MIG l Machine cost more than stick welder l Difficult to use

MIG l Gas pressure of 20 psi l Gas mixture: l 75% argon l

Purpose of Gas Mixture l Keeps nitrogen and oxygen out of weld bead l

MIG Wire size: 0. 035 inches l. Mild steel copper coated electrode l Welding

3 adjustments must be in balance to achieve a quality weld l Voltage control

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MIG Welding

MIG Welding l MIG – Metal Inert Gas, also referred to as GMAW. l GMAW – Gas Metal arc welding

MIG Welding l A semi-automatic welding process using a DC power source, a wire feeder, shielding inert gas, and a consumable electrode.

Advantages of MIG l l l l Faster than arc Smooth bead Easy to start b/c can place nozzle on metal without creating arc No slag to chip off Less damage to base metal b/c of fast travel speed Can join both ferrous and nonferrous metals (can be used with aluminum and stainless) No electrode stub loss

Disadvantages of MIG l Machine cost more than stick welder l Difficult to use in hard to get places

MIG l Gas pressure of 20 psi l Gas mixture: l 75% argon l 25% CO 2

Purpose of Gas Mixture l Keeps nitrogen and oxygen out of weld bead l Increases penetration l Reduces spatter

MIG Wire size: 0. 035 inches l. Mild steel copper coated electrode l Welding Jelly can be used to prevent spatter from sticking to tip l Use at least a number 10 shade lenses, 12 is sometimes recommended. l Almost all MIG welding is performed in the direct current electrode positive mode (DCEP) l

3 adjustments must be in balance to achieve a quality weld l Voltage control l 18 -21 l Wire feed speed l 200 l volts - 280 Shielding gas flow rate l 15 -20 psi