LONG PRESSURE WELDED COMPOSITE PLATE, AND ITS MANUFACTURE

摘要

PROBLEM TO BE SOLVED: To improve productivity of a composite plate, which has given plate thickness, plate length, thickness ratio, joining contribution rate, and joining strength, and is superior in dimensional accuracy by specifying the melting point, heating temperature, and pressing rate of the metallic plate to be compounded so as to carry out pressure welding. SOLUTION: One of metallic plates arranged on both main face sides of the composite plate as a bimetal material, is composed of Ni, or one kind out of Ni-Mn-Fe base, Ni-Cr-Fe base, Ni-Mo-Fe base, and Cu-Ni-Mn base alloys, and the other is composed of one kind out of Ni-Fe base, Cr-Fe base, Ni-Co-Fe base alloys. Its melting point is 900 deg.C or more. Furthermore, the thickness ratio of both plates is in a range of 1:1-1:2, and the total length is 100 m or more. After the metallic plate is arranged at the pressure welding position, it is heated to 100-400 deg.C before pressure welding. Then, the plate is pressure welded at the pressing rate of 60%, so as to form the composite plate with the total thickness of 1.5-5 mm, joining contribution area rate of 50% or more at a joining interface, and joining strength of 15 N/mm or more. Additionally, it is preferable to carry out diffusion annealing to the composite plate being pressure welding.