Page 91 - CITS - Fitter - Trade Theory

FITTER - CITS

1 Power Source:

• The power source supplies the electrical current needed to generate the welding arc. It can provide either
direct current (DC) or alternating current (AC), depending on the material being welded and the welding
requirements.
2 TIG Welding Torch:
• The TIG welding torch holds the tungsten electrode and directs the flow of shielding gas to the weld area. It
also provides a means for the welder to control the arc length and manipulate the weld pool.
3. Shielding Gas Unit (Argon/Helium):
• A supply of inert shielding gas, typically argon or helium, is essential to protect the weld area from atmospheric
contamination. The choice of gas depends on the material being welded and the specific welding requirements.
4. Water Cooling System:
• In high-amperage TIG welding applications, where the torch may become hot during prolonged use, a water
cooling system is employed to prevent overheating. It circulates water through the torch to dissipate heat and
maintain proper operating temperatures.

5. Filler Wires for TIG Welding:
• Filler wires are used to add material to the weld joint, if necessary, to achieve the desired weld size and
strength. The filler wire material should match or be compatible with the base metal being welded.

6. Tungsten Electrodes:
• Tungsten electrodes are non-consumable electrodes used to initiate and maintain the welding arc. Tungsten
is chosen for its high melting point and stability at high temperatures. Various types of tungsten electrodes are
available, each with specific characteristics suited for different welding applications.
• Advantages of TIG welding:
Gas Tungsten Arc Welding (GTAW), or Tungsten Inert Gas (TIG) welding, offers numerous advantages,
making it a preferred choice for various welding applications. Here’s a summary of the advantages:
1 High-Quality Welds: TIG welding produces welds of exceptional quality with excellent precision and control,
ensuring superior mechanical properties and weld integrity.

2 Versatility: TIG welding can be used to weld a wide range of metals and alloys, including stainless steel,
aluminium, copper, titanium, nickel alloys, and more.
3 Narrow Heat-Affected Zone and Deeper Penetration: TIG welding results in a narrow heat-affected zone
(HAZ), deeper penetration into the base material, and minimal distortion, making it suitable for welding thin
sections and heat-sensitive materials.
4 No Post-Weld Cleaning Necessary: TIG welds typically require minimal post-weld cleaning, reducing the
need for additional labour and improving efficiency.

5 Less Smoke or Fumes: TIG welding produces minimal smoke and fumes, creating a healthier work
environment and reducing the need for extensive ventilation systems.
6 Simple Filler Metal Control: TIG welding allows for precise control over the deposition of filler metal, enabling
welders to achieve the desired weld profile and mechanical properties.
7 No Spattering: TIG welding produces welds without spatter, resulting in cleaner welds and minimizing the risk
of weld defects.
8 Possible to Weld Thin Sections: TIG welding is well-suited for welding thin materials, thanks to its ability to
control heat input and minimize distortion.

1 Welding of High-Thickness Components: TIG welding can weld components of significant thickness,
making it suitable for welding heavy-duty structures and components.
Easy to Learn: While mastering TIG welding requires practice and skill, the process itself is relatively
straightforward, making it accessible to beginners.

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CITS : CG & M - Fitter - Lesson 12