GWH4 datasheet(33/48 Pages) CLARKE

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OPERATING THE WELDER (TIG WELDING)

TIG welding is primarily for very thin materials. It uses a non-consumable tungsten

(or tungsten alloy) electrode held in a torch.

A shielding gas (100% Argon), is fed through the torch to protect:

• The electrode

• Molten weld pool

• Solidifying weld metal from contamination by the atmosphere

The electric arc is produced by the passage of current through the conductive, ionized

shielding gas. The arc is established between the tip of the electrode and the work.

Heat generated by the arc melts the base metal. Once the arc and weld pool are

established, the torch is moved along the joint and the arc progressively melts the

joined surfaces. Filler wire, if used, is usually added to the leading edge of the weld

pool to fill the joint.

This process is ideally suited for welding thin metals such as car body panels,

pressure vessels, heat exchangers, pipes etc., where accuracy and a high quality weld

is desired, as it produces a very low porosity weld.

MAIN FEATURES OF TIG WELDING

1. Electronic control of welding current.

2. Forced air cooling.

3. A thermal overload protection device prevents overheating.

TIG WELDING PROCESS ADVANTAGES

• It produces superior quality welds, generally free of defects.

• It is free of the spatter which occurs with other arc welding processes.

• It can be used with or without filler metal as required.

• It allows excellent control of root pass weld penetration.

• It can produce welds at high speeds.

• It allows precise control of the welding variables.

• It is capable of welding very thin material (0.5mm), without undue

distortion.

LIMITATIONS

1. Greater weld dexterity is required.

2. The DC output is not suitable for welding aluminium.

GWH4 Datasheet(PDF) 33 Page - Clarke International