OPERATION
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Electrode Angle
The angle that the electrode makes with the work is important to ensure a smooth, even
transfer of metal. When welding in down hand, fillet, horizontal or overhead the angle of
the electrode is generally between 5 and 15 degrees towards the direction of travel. When
vertical up welding the angle of the electrode should be between 80 and 90 degrees to
the work piece.
Travel Speed
The electrode should be moved along in the direction of the joint being welded at a
speed that will give the size of run required. At the same time, the electrode is fed
downwards to keep the correct arc length at all times. Excessive travel speeds lead to
poor fusion, lack of penetration etc, while too slow a rate of travel will frequently lead to
arc instability, slag inclusions and poor mechanical properties.
Material and Joint Preparation
The material to be welded should be clean and free of any moisture, paint, oil, grease,
mill scale, rust or any other material that will hinder the arc and contaminate the weld
material. Joint preparation will depend on the method used include sawing, punching,
shearing, machining, flame cutting and others. In all cases edges should be clean and
free of any contaminates. The type of joint will be determined by the chosen application.
§4.2 Installation & Operation for TIG Welding
§4.2.1 Set-Up for TIG Welding
(1) Insert the earth cable plug into the positive socket on the front of the machine and
twist to lock in place
(2) Plug the welding torch into the negative socket on the front panel and twist to lock.
(3) Connect the gas line of TIG torch to outlet gas connector on the front of the machine.
(4) Connect the control cable of torch switch to 9-pin socket on the front of the machine.
(5) Connect the gas regulator to the gas cylinder and the gas line to the gas regulator.
(6) Connect the gas line to the machine inlet gas connector located on the rear panel.
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