What is MIG/MAG Welding?

MIG/MAG Welding in LPG Cylinder Production

MIG/MAG Welding in Cylinder Production

MAG Welding with Solid Wire

Gas Metal Arc Welding is a welding arc process which utilizes the heat of an electric arc. Electric arc is continuously maintained between wire and workplace. Electric arc makes the wire melt, then the weld metal is transferred to the workpiece.

The weld area is protected by a shield of gas. This shield protects both the melting wire and the weld area from the oxygen and nitrogen in the air. If these gases enter into the shielding gas atmosphere, it may cause porosities in the weld and that is an unwanted situation. Shielding gas must be coered and controlled not to blown away with the exterior disturbances, for example wind from open doors and windows. Ventilating air currents have influence on the welding place and the shielding gas. Depending on the applied type of shielding gas, it is usually divided into two methods.

What is MIG Welding (Metal Inert Gas Welding)?

MIG welding is welding in an atmosphere of inert gas. It means welding with a shielding gas that does not react with other substances. So, the welding will not be affected with chemical reactions. In European region, argon and helium inert gases are mostly used in welding operations. Usually, the welding process is called MIG welding even when the inert gas is mixed with small quantities of O2, CO2, H2 or similar substances.

What is MAG Welding (Metal Active Gas Welding)?

MAG welding is welding in an atmosphere of reacting gases. It is shielded by an active gas. It means that the shield gas is separated in the arc and to a smaller or larger extent reacts with the weld pool. This process is known as CO2 welding since CO2 is mainly used as shielding gas.

Advantages of MIG/MAG Welding

  • It is an economic way for welding for its high welding speed. You do not need to change the electrode rods in short time, so a long arc time can be maintained.
  • The method provides the opportunity for rational welding of materials which are difficult to weld.
  • Welding is possible in all positions.
  • The arc and the weld pool is clearly visible.
  • Usually only little aftertreatment of the weld is necessary. No slag to chip off weld.
  • Low skill factor required to operate M.I.G / M.A.G.S welding torch.
  • The process is easily automated.

Disadvantages of MIG/MAG Welding

  • Initial setup cost is high.
  • Higher maintenance costs due to extra electronic components.
  • Welding process atmosphere has to be stable. Mostly in no-wind conditions.
  • The setting of plant variables requires a high skill level.
  • Radiation effects are more severe.

Applications of MIG/MAG Welding

MIG/MAG welding is usually used with:

  • Stainless steels
  • Aluminium
  • Ordinary mild steels
  • Copper and copper alloys

In addition to the above metals this method is suited for magnesium, nickel and a number of other metals and metal alloys.

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