TIG

Question 1

Describe with the aid of a diagram TIG (Tungsten Inert Gas Welding)

Answer 1

Draw setup and zoomed-in view of the arc. Write bullet points on key points.

Question 2

Why is TIG welding suitable for welding aluminium?

Answer 2

Aluminium oxidises very quickly when heated (A layer of oxygen gets sucked into the aluminium). If this oxide layer is not removed it results in a poor weld quality.

This tenacious oxide layer is overcome with the use of the cathodic action of the alternating current. (positive ions are bombarded against the aluminium destroying the oxide layer)

Question 3

Describe the welding process shown under the following guidelines:

(i) Name
(ii) Method of operation
(iii) Applications

Answer 3

Name = TIG

Method of operation =

1. A gun with a non-consumable tungsten electrode is held by the operator.
2. A separate wire filler rod is used if required.
3. The gun issues gas over the weld area to prevent it from oxidising.
4. TIG welding issues an inert gas such as argon.
5. TAGS welding issues a mixture of gases e.g. argon and carbon dioxide

Applications = Used to weld steel, stainless steel, aluminium and copper