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Gas Metal-ArcWelding-GMAW The gas metal-arc welding
process (GMAW), often called MIG, has revolutionized arc welding. In this process,
a consumable electrode (in the form of wire) is fed from a spool through the torch
(welding gun) at a preset controlled speed. As the wire passes through the contact tube of
the gun, it picks up the welding current. The consumable wire electrode serves two
functions: it maintains the arc and provides filler metal to the joint. The method of
delivery of the filler metal allows GMAW welding to be basically a one-handed operation
which does not require the same degree of skill as GTAW. Figure 8-23 shows the basic
principle of gas metal-arc welding.
An important factor in the
GMA welding process is the high rate at which metal can be deposited. This high rate of
metal deposition and high speed of welding results in minimum distortion and a narrow
heat-af-fected zone. When you are deciding whether to use GTA or GMA welding, the
thickness of the material should be a deciding factor. GMAW is often chosen for welding
thicker material. Like GTA welding, gas
metal-arc welding also uses a shielding gas to protect the weld zone during welding. The
inert gas is fed through the gun into the weld zone and prevents atmospheric
contamination. GMAW offers many of the
advantages of GTAW. Since there is no flux, GMA welds are clean and there is no slag to
remove. GMAW enables you to produce sound welds in all positions quickly. Now let’s
take a look at the equipment you will use for GMA welding.
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by SweetHaven Publishing Services Based upon a text provided by the U.S. Navy |
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