Process for the non-cracking energy beam welding of high tempera

Details Process for the non-cracking energy beam welding of high tempera Process for the non-cracking energy beam welding of high tempera

1981-08-11

1983-10-11

Albritton, C. L.

Electric heating

Metal heating

By arc

219121EM, 219121LD, 219121LM, B23K 1500

Patent

active

044094620

ABSTRACT:
In order to join by welding shaped parts, in particular, of cast superalloys based on nickel or cobalt, without cracking, by means of a beam of energy, preferably an electron beam, according to the invention the weld zone and an adjacent area of adequate size, often the entire part, are heated to a preheat temperature between 1000.degree. to 1250.degree. C., preferably between 1070.degree. and 1180.degree. C., and maintained at this temperature at least until the temperature is at least extensively equalized. The weld surfaces in contact with each other are then melted and welded together by means of the energy beam. Subsequently, the weld zone and the adjacent area are cooled uniformly.
In this manner, a welded joint is obtained having mechanical properties that are equal to or only slightly reduced compared to those of the initial material and containing no pores or cracks.
The process according to the invention is particularly suitable for the production or repair of hot parts of gas or steam turbines, such as, for example, turbine blades and/or turbine housings.

REFERENCES:
patent: 3617685 (1971-11-01), Brill-Edwards
patent: 3975612 (1976-08-01), Nakazaki et al.
patent: 3999030 (1976-12-01), Nakazaki et al.
patent: 3999031 (1976-12-01), Yonezawa et al.
patent: 4288677 (1981-09-01), Sakata et al.
Sims, et al., The Superalloys, Interscience Publication, pp. 530-532, 598, 599, 1972.

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