Box header welding method and apparatus

Details Box header welding method and apparatus Box header welding method and apparatus

1991-09-27

1993-06-22

Shaw, Clifford C.

Electric heating

Metal heating

Of cylinders

219 602, B23K 900

Patent

active

052218180

ABSTRACT:
A method and apparatus for welding tubes to a tube sheet uses a gas tungsten arc welding (GTAW) torch assembly that is small enough to be inserted through small access holes in a box header. The welding torch is carried near the end of a rotating mandrel that is supported for rotation within a stationary tube. A centering mechanism is inserted into the tube to ensure proper radial alignment of the welding torch with respect to the tube. At the other end of the mandrel is a mechanism for rotating the mandrel and for supplying electrical power, shielding gas and cooling water to the torch and wire to the weld. Axial spacing of the welding torch is provided by a tube stop device that temporarily engages the end of the tube in combination with an axial adjustment device. Once the mandrel is inserted into the tube to be welded, the adjustment device is brought into engagement with the header box wall, a stop lock collar is locked in place, and an adjustment ring is turned a specified amount to move the torch and the stop device axially away from the end of the tube. The torch is then energized and rotated about the joint to weld the tube to the tube sheet.

REFERENCES:
patent: 2908805 (1959-10-01), Apblett et al.
patent: 3118051 (1964-01-01), Dixon
patent: 3345494 (1967-10-01), Apblett, Jr. et al.
patent: 3384734 (1968-05-01), Jakobsson
patent: 3777110 (1973-12-01), Yohn et al.
patent: 3946191 (1976-03-01), Graham
patent: 4142084 (1979-02-01), Torrani
patent: 4357515 (1982-11-01), Kiefer et al.
patent: 4629853 (1986-12-01), Yttergren et al.

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