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PRACTICAL TIG (GTA) WELDING These liquid gases are held at very low temperatures, in the case of argon at -300 F, so the siting of bulk cryogenic tanks is critical. Consult your supplier for advice on which is most suitable for you. 9%. The advantages of argon are its low ionisation potential and thermal conductivity. 5 times denser than air it maintains good blanket coverage at the arc for longer periods than helium. 5 electron volts. This is the voltage necessary to remove an electron from a stable atom and convert it into a charged atom or positive ion, making the gas in the area of the arc into a plasma.
E. 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.
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