Tuesday 20 November 2012

METAL INERT GAS ARC WELDING (MIG WELDING)

That type of arc welding which uses a consumbale metal electrode in an inert gas atmosphere to produce a weld ,is known as MIG metal inert gas ) welding.


Process illustrates the working principle of a MIG welding while.The schematic arrangement of MIG welding equipment .The arc is struck between the metal electrode and the workpiece .The electrode is in the form of a continuous wire which is fed into the arc ,by an adjustable speed electric motor running the wire feed rolls at the same speed at which it is melted and deposited in the weld.this process can be used for welding in positions however best results are obtained in flat and horizontal position.
fig.1 Gas -Arc (MIG) Welding Working Principle

fig 2. MIG Welding Equipment ( Schematic Arrangement )
Usually D.C. with straight polarity is used in MIG welding .AC is not used in this method .Use of D.C . reverse polarity enables a deeper penetration and  clean weld surface.Inert arogn,helium .carbon dioxide or a mixture of these gases is used for providing the inert gas shield .Formerly argon was mainly used ,but now carbon dioxide is more widely used .

Application : This process also finds an extensive use in missiles and aerospace fabrication.

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