Plasma or TIG welding or cutting process with a non-oxidizing ga

Details Plasma or TIG welding or cutting process with a non-oxidizing ga Plasma or TIG welding or cutting process with a non-oxidizing ga

1999-03-16

2000-05-30

Ryan, Patrick

Electric heating

Metal heating

Nonatmospheric environment at hot spot

21912152, 252372, B23K 916, B23K 900, C06D 1500

Patent

active

060693363

ABSTRACT:
The invention relates, on the one hand, to an electric-arc work process, such as a plasma cutting or TIG welding process, in which a torch is supplied with at least one non-oxidizing gas, the said torch being provided with at least one electrode made of pure or alloyed metal, such as a tungsten electrode, characterized in that the said non-oxidizing gas contains a concentration of impurities of the oxygen type [O.sub.2 ] of less than 80 ppmv and a concentration of impurities of the water vapor type [H.sub.2 O] of less than 400 ppmv and, on the other hand, to such a welding gas.

REFERENCES:
patent: 4558201 (1985-12-01), Hatch
patent: 4977305 (1990-12-01), Severance
patent: 5210388 (1993-05-01), Farwer
patent: 5210389 (1993-05-01), Farwer
patent: 5396039 (1995-03-01), Chevrel et al.
patent: 5539171 (1996-07-01), Ohmi et al.
patent: 5558791 (1996-09-01), Farwer
patent: 5667133 (1997-09-01), Ohmi et al.

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