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Welding history

Classification of welding

Effect of welding speed

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Types of welding joints

Welding position

Welding electrodes

Types of welding flame

Welding flux

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Advantages of welding joints

Thermal properties of metal

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Types of welds

Brazing

Soldering

MIG Welding

MIG Welding Principle

Metal Inert Gas or MIG weld process have in common the electrode used as the filler wire which is continuously fed and heating the job with an arc is established on the work, total or partial inert gas used for shielding the produced arc. There is no flux used for weld, helium, argon, carbon-dioxide or some gas mixture is used to shield for the arc and molten metal from atmosphere.

There are two types of MIG welds are used, one fully automated and other is semi-automated. The semi-automated version is used in very largely.


Principle operation:


This welding process is said for semi-automated MIG welding. Check the electrical supply, water supply and gas flow in before going to ignition started. Then set the feed of electrode and proper current also. The electrode should be projected about 12-16 mm from the torch tip before going to start arc. The arc length should be maintaining about 2-4mm and the torch tip should be 10-12mm from the work piece. To produce the arc the shielding gas and proper current supply is to be on and scratch the electrode against the job, then moved forward to carry out MIG welding. Always take in mind that the electrical supply, gas flow and water supply should be on. The torch is moved along the joint for carrying out the welding process and the torch angle is about 700with the horizontal.

Application:


MIG welding has large used in automobile industry, aircraft parts welding, pressure vessel manufacturing and many other places.For welding tool steels, carbon, silicon and low allow steels, stainless steel, aluminium and its alloy, magnesium, nickel and its alloy, copper and its alloy, titanium and so many metals.

It is used for refrigerator parts manufacturing .

Advantages:


There are many advantages of MIG welding mention bellow:

Joints can produce with deep penetration.

The metals thickness can not be vary with this MIG welding process. Thick and thin metals are welded very effectively.

This welding process is very suitable for large scale production unit because, it can be performed much faster than other types of welding process like TIG etc.

Large amount of metal can be deposited on the work piece.

The

MIG welding process can reduces the welding cost, because it produces neat and clean metal deposit on the work piece. Spatter free and smooth welding surface is produced, so it is no need to extra cleaning.

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MIG Welding Principle