The MIG Torch

This provides the method of delivery from the wire feed unit to the point at which welding set is required.

The MIG torch can be air cooled or water cooled and most modern air cooled torches have a single cable in which the welding wire slides through a Liner. Gas flows around the outside of this Liner and around the tube the Liner sits in is the power braid and trigger wires. The outer insulation provides a flexible cover.

Water cooled MIG torches are similar to the above, but gas hose, liner tube, power lead (including water return pipe), water flow pipe and trigger wires are all separate in an outer sleeve.

Most industrial MIG equipment uses a standard European MIG torch connector for easy connection of torch, some low cost smaller units use individual manufacturers fittings.

The important areas of maintenance are: Liners are in good condition and correct type and size; Contact tips are lightly fitted, of correct size and good condition.

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Shielding Gas

This is a complicated area with many various mixtures available, but the primary purpose of the shielding gas in the MIG process is to protect the molten weld metal and heat affected zone from oxidation and other contamination by the atmosphere.

The shielding gas should also have a pronounced effect on the following aspects of the welding operation and the resultant weld.

• Arc Characteristics A basic position or starting point would be

• Mode of Metal Transfer

• Penetration and Weld Head Profile Aluminium

• Speed of Welding Magnesium

• Undercutting Tendency Copper Alloys

• Cleaning Action Steel