Electric heating – Metal heating – For deposition welding
Patent
1997-10-20
2000-01-11
Shaw, Clifford C.
Electric heating
Metal heating
For deposition welding
21912511, B23K 904
Patent
active
060138904
ABSTRACT:
A method is disclosed for applying a weld overlay to a tube. Using a first weld head, a bead of overlay material is applied onto a tube by melting the overlay material. In the process of applying the weld bead to the tube, a heat affected zone is created within the tube. Thereafter, a second weld head is employed to apply sufficient heat to the exterior of the tube to raise the temperature within the heat-affected zone to a temperature higher than its tempering temperature but lower than its Ae1 temperature. In this manner the heat affected zone is eliminated without creating a new heat affected zone in the process.
In the disclosed embodiment, the tube is rotated with respect to the weld heads, while the weld heads move along the longitudinal axis of the tube. According to the disclosed embodiment, the first weld head employs a gas-metal arc welding process, and the second weld head employs a gas-tungsten arc welding process.
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patent: 2427350 (1947-09-01), Carpenter et al.
patent: 2756311 (1956-07-01), Persson et al.
patent: 2868954 (1959-01-01), Skinner et al.
patent: 3139511 (1964-06-01), Kudelko
patent: 3549857 (1970-12-01), Needham et al.
patent: 4948936 (1990-08-01), Landry
Shaw Clifford C.
Welding Services, Inc.
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