Method and device for controlling pipe welding

Details Method and device for controlling pipe welding Method and device for controlling pipe welding

1997-05-23

1999-01-26

Shaw, Clifford C.

Electric heating

Metal heating

Of cylinders

219 74, B23K 9167

Patent

active

058641114

ABSTRACT:
A method and device for welding pipe onto a piping network at a joint comprising introducing an inert purging gas under pressure at a substantially constant flow rate at one end of the pipe away from the weld joint, providing a flow restriction at the end of the piping network away from the weld joint, diverting a minor portion of the inert purging gas flowing through the piping network into and through a constant back pressure maintaining device for maintaining a substantially constant back pressure on the inert purging gas in the piping network during the welding, whereby any changes in back pressure occurring in the piping network cause a greater or lesser amount of the inert purging gas to flow through the constant back pressure maintaining device, thereby enabling production of precise and highly reproducible welds with an orbital welder.

REFERENCES:
patent: 3614378 (1971-10-01), Goodell et al.
patent: 4723064 (1988-02-01), Bothe, II
patent: 5304776 (1994-04-01), Buerkel et al.
patent: 5396039 (1995-03-01), Chevrel et al.
patent: 5425492 (1995-06-01), Thode
patent: 5597109 (1997-01-01), Ohmi et al.

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