By P.W. Muncaster, P. W. Muncaster

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Extra info for A Practical Guide to TIG (GTA) Welding

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A reputable manufacturer or agent should be consulted once your demands are established. If any doubt exists a professional welding society will assist you. lnstallatlon and malntenance Unless absolutely necessary it is best to install a power source in a convenient spot and leave it there, thus avoiding trailing mains supply cables, gas and water hoses, ctc. All connections should be kept as short as possible. Make sure if you are using cylinder gas that there is adequate space near to the power source to change heavy cylinders easily and quickly (chain cylinders back to a wall if possible).

5 Hz. 0 A average current Then 10 A X 1 1 V X 20 secs = 2200 J. + VlABlLlN Pulsed TIC welding has a drawback in that it is slower than using unpulsed current but its great advantage is that heat build-up in the component is much reduced. Indeed pulsed current is even used to weld end caps to seal the ends of small detonator cans after filling with explosive. Pulsed current also does not permit too much build-up of residual heat in circumferential or orbital welding especially where, at the end of a run, the weld seam overlaps the start.

G. 05 mm sections and convolutes for edge welded bellows which are often better welded without pulsing). The aim of pulsing is mainly to achieve maximum penetration without excessive heat build-up, by using the high current pulse to penetrate deeply and then allowing the weld pool to dissipate Some of the heat during a proportionately longer arc period at a lower current. Modern power sources provide a square waveform for the pulse cycle, Fig. 2. In the USA the low level time B is sometimes known as the keep-alight period, an apt term.

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