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Working principles, advantages and disadvantages of MIG welding

Today I will be discussing on the Working principle of Metal inert gas welding (MIG). Its advantages and disadvantages will also be revealed. Previously, an article was published on What is MIG welding?.

Working principles of MIG welding

Working principles of MIG welding

This welding process is achieved when a cable from either AC or DC power supply is connected to a consumable electrode (welding gun) and the earth cable is placed on the workpiece. At this point, the welding gun is carrying current. Whenever it is placed closed to the workpiece, an arc is produced. This arc melts the base metals. Inert gas supply is provided around the electrode during the process. This gas shield is around the arc and the weld pool, helping to protect the weld from the external atmospheres. At this point, it solidifies and the joint is obtained.

Watch video on how metal arc welding works


The followings are the advantages of metal inert gas welding MIG:

  • It is easy and simple
  • Filler material is not needed
  • The gas is protected automatically
  • Continuous electrode is easy to feed
  • It does not produce slag


Despites the great benefits of MIG welding, the following are disadvantages of this welding process.

  • The welder is exposed to hazardous gases
  • Weld becomes porous if the welding gun is not properly handled
  • Improper welding may lead to the floating of solid impurities over the liquid welding
  • It is expensive and the equipment is not portable
  • It cannot be done outdoor because of effect of wind, dispersing the shielding gas.

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And that is it for this article, working principles of MIG welding, its advantages and disadvantages. I hope you enjoy reading it. If so, kindly comment, share, and stay with us. Thanks for reading!

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