Welded members piping system and welding method and clean room

Details Welded members piping system and welding method and clean room Welded members piping system and welding method and clean room

1998-06-02

1999-11-02

Shaw, Clifford C.

Electric heating

Metal heating

By arc

219 61, 219 75, B23K 9167

Patent

active

059775165

ABSTRACT:
A welding method in which the outer-most surfaces of ferritic stainless steel contains chromium oxide surfaces with no iron oxides. The welding method includes flowing a gas having an oxidizing activity over the welded part while applying an arc to the welded part, which is insufficient to melt the welded part. The resulting welded stainless steel is suitable for use as clean room gas supply lines.

REFERENCES:
patent: 3677908 (1972-07-01), Sperl
patent: 4119765 (1978-10-01), Pinnow et al.
patent: 4685707 (1987-08-01), Miyashita
patent: 4853284 (1989-08-01), Ishii et al.
patent: 4950522 (1990-08-01), Amend et al.
patent: 5440090 (1995-08-01), Davis et al.

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