Gas Metal Arc Welding is generally known as MIG (Metal Inert Gas) welding. Metal Inert Gas (MIG) welding is a commonly used high deposition rate welding process. Wire is
continuously supplied from a spool. MIG welding is known to as a
semiautomatic welding process.
Principle of Operation
In the first method current is passing and shielding gas is switched on to flow. Now the electrode is scratched against the job like normal practice for striking the arc.
In the second method, electrode touches the job, retracted and then moved forward to carry out the welding; before striking the arc, shielding gas, water and current is switched on. About 15 mm length of the electrode is out of the torch before striking the arc. During welding, torch remains about 10-12 mm the job and length should be between 1.5 to 4 mm. Arc length is maintained constant by using t self-adjusted arc, and self-controlled arc in semi-automatic (manually operated) and automatic welding sets respectively.
Read :
- Flux shielded metal arc welding process principle
- Advantages and disadvantages of Submerged Arc welding
- Tungsten Inert Gas welding or TIG welding
- Resistance Spot Welding Working Principles with merits and demerits
- Resistance Seam Welding Advantages and Disadvantages
- Different Types of Welding Defects
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