Metal fusion bonding – Process – Diffusion type
Patent
1995-02-08
1996-12-17
Heinrich, Samuel M.
Metal fusion bonding
Process
Diffusion type
228132, 2282332, 138142, B23K 2000
Patent
active
055844286
ABSTRACT:
Clad pipe having an inner pipe and an outer pipe metallurgically bonded to each other is manufactured by a process comprising the steps of: (a) preparing an inner pipe and an outer pipe made of different metallic materials, the outer pipe having an inner diameter larger than the outer diameter of the inner pipe; (b) forming an Ni-B layer by electroplating or electroless plating on the surface of one of the pipes facing the other pipe when the two pipes are assembled, the Ni-B layer having a thickness of 2-100 .mu.m and consisting essentially, on a weight basis, of B: 0.5%-7%, Fe: 0%-30%, P: 0%-7%, and a balance of Ni and inevitable impurities; (c) assembling the two pipes by inserting the inner pipe into the outer pipe; (d) subjecting the assembled pipes to cold working for reduction in diameter to such a degree that the outer diameter of the inner pipe is reduced by from 0.5% to 10% to form raw clad pipe in which the inner and outer pipes are in contact; and (e) subjecting the raw clad pipe to heat treatment in the temperature range of 1050.degree.-1250.degree. C. for a time sufficient to metallurgically bond the inner and outer pipes by diffusion bonding.
REFERENCES:
patent: 4869422 (1989-09-01), Turner
patent: 5371945 (1994-12-01), Schmoor
Fukui Kunihiro
Furugen Munekatsu
Kimoto Masanari
Ogawa Kazuhiro
Okamoto Hiroshi
Heinrich Samuel M.
Sumitomo Metal Industries Ltd.
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