Process for the diffusion welding of copper and stainless steel
First Claim
1. A process for the diffusion welding of copper and stainless steel, which comprises the step of smoothening the surfaces of copper and stainless steel to be bonded together, cleaning the both surfaces until chemically active surfaces are exposed, and bringing either active surface into close contact with the mating stainless steel or copper surface smoothened and cleaned in advance, through a layer of insert metal which is at least one metal selected from the group consisting of Ni, Ni-base alloys, and Cr, said layer of insert metal containing not more than 140 ppm O2 and ranging in thickness more than 5μ
- ; and
the step of bonding said copper, insert metal layer, and stainless steel altogether by diffusion welding in a vacuum or other non-oxidizing atmosphere at a temperature from 850°
to 950°
C.
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Abstract
A process for the diffusion welding of copper and stainless steel, which comprises sandwiching a thin layer of at least one metal selected from the group consisting of Ni, Ni-base alloys, Cr, Ni-Cr, and Cr-Ni with little gas contents, as an insert metal, between the surfaces of copper and stainless steel to be bonded, and then diffusion welding the sandwich.
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Citations
14 Claims
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1. A process for the diffusion welding of copper and stainless steel, which comprises the step of smoothening the surfaces of copper and stainless steel to be bonded together, cleaning the both surfaces until chemically active surfaces are exposed, and bringing either active surface into close contact with the mating stainless steel or copper surface smoothened and cleaned in advance, through a layer of insert metal which is at least one metal selected from the group consisting of Ni, Ni-base alloys, and Cr, said layer of insert metal containing not more than 140 ppm O2 and ranging in thickness more than 5μ
- ; and
the step of bonding said copper, insert metal layer, and stainless steel altogether by diffusion welding in a vacuum or other non-oxidizing atmosphere at a temperature from 850°
to 950°
C. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification