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Gas Metal Arc Welding (GMAW)
Gas Metal Arc Welding (GMAW)
Different Types of Metal Transfer
- Short Circuit: transfer of a single molten drop
- Globular: transfer of a continuous solid or metal-cored wired electrode is deposited
- Axial Spray: transfer of a stream of small molten droplets
- Pulsed Spray: Transfer of a high energy peak level in the form of a single molten droplet
The Alloy Material Range for GMAW Includes:
- Carbon Steel
- Stainless Steel
- Aluminum
- Magnesium
- Copper
- Nickel
- Silicon Bronze
- Tubular Metal-Cored Surfacing Alloys
GMAW/MIG Welding
- Gas Metal arc Welding is also referred to as MIG
- GMAW: a welding process in which an electric arc forms between a consumable MIG wire electrode and the workpiece metal(s), which heats causing the workpieces to join
Advantages
- Ability to join a wide range of metals
- Equipment is simple, easily accessible, and cheaper
- All welding positions capability
- Excellent weld bead appearance
- Lower heat input compared to other welding processes
- Low spatter and slag
- Less welding fumes when compared to other welding processes
Disadvantages
- Short-Circuit lower heat input restricts certain thin metals
- The higher heat input for Axial Spray restricts certain thicker metals
- Higher heat input for Axial Spray also is restricted to flat or horizontal welding positions
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