Method of heat treatment for two welded-together parts of differ

Details Method of heat treatment for two welded-together parts of differ Method of heat treatment for two welded-together parts of differ

1994-02-01

1995-04-18

Yee, Deborah

Metal treatment

Process of modifying or maintaining internal physical...

Producing or treating layered, bonded, welded, or...

C21D 950

Patent

active

054074975

ABSTRACT:
A method of heat treatment for two welded-together parts of different steel alloy grades, the first part, called A, having critical heating transformation temperatures AC.sub.1 A and AC.sub.3 A and an optimum post-welding treatment temperature .theta..sub.A which is lower than AC.sub.1 A, the second part, called B, having critical heating transformation temperatures AC.sub.1 B and AC.sub.3 B, which are respectively lower than AC.sub.1 A and AC.sub.3 A and an optimum post-welding treatment temperature .theta..sub.B which is lower than AC.sub.1 B and .theta..sub.A, wherein a first heat treatment cycle is carried out at said temperature .theta..sub.A followed by a second heat treatment cycle at a temperature .theta..sub.B. Between the two cycles, the temperature is reduced to below 100.degree. C.

REFERENCES:
patent: 2133926 (1938-10-01), Ransom et al.
J. Brozda, "Structure and Properties of Electroslag Welds Following Heat Treatment", Welding International, vol. 6, No. 3, 1992, pp. 173-180.
D. E. Tasak et al, "Structure and Properties of Electroslag Welds Following Heat Treatment", Welding International, vol. 2, No. 2, 1988, pp. 130-134.

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