GWH4 datasheet(34/48 Pages) CLARKE

34 / 48 page

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TIG WELDING

Before TIG welding you must obtain the correct torch and a gas cylinder of 100%

pure Argon. (see page 45)

To prepare the machine for TIG welding, adopt the following procedure.

1. Plug the work clamp lead in to the +ve terminal, and secure the work clamp to the

workpiece.

2. Connect the torch to the -ve terminal

• For good contact, the work clamp must be attached to clean bare metal.

Clean with a wire brush where necessary.

3. Ensure the electrode at the torch nozzle, protrudes by 4 - 5mm. Also ensure that

the electrode is sharply pointed with an angle of 40o- 60o if it is not, grind it to

shape.

4. Set the welding current for the thickness of the material to be welded and the size

of tungsten electrode to be used.

5. If the machine stops at any time and the Error Code E19 is displayed, the thermal

overload has intervened. Wait until the welder has cooled sufficiently before

restarting work.

6. Cover your face with the head shield, bring the torch to within 3-4mm of the work,

and at an angle of 40-60o so that the ceramic nozzle gently touches the work

surface..

7. Scratch the tip of the electrode against the piece to be welded, as soon as the

welding arc starts, remove the electrode to a distance of 3-4 mm, and continue

the weld. (See notes below).

• This method is referred to as ‘Scratch Arc’.

8. To stop welding remove the torch from the workpiece.

9. Turn off the gas as soon as you finish welding.

Notes

• To avoid a visible strike mark on the surface of the workpiece it is advisable

to strike the arc in the joint where the mark will be concealed by the weld.

GWH4 Datasheet(PDF) 34 Page - Clarke International