Claims
- 1. A process for manufacturing an assembly device of tubes of low carbon ferritic stainless steel on a tube-plate of carbon steel, comprising:
- fusion welding a first overlay onto a surface of the tube plate using a welding flux;
- fusion welding a second overlay onto the first overlay using a welding flux;
- said first overlay being made of low carbon austenitic stainless steel, in strip form, and having 11.5 to 14% by weight of nickel and 22 to 25% by weight of chromium;
- said second overlay being made of low carbon austenitic stainless steel, in strip form, and having 10-12% weight of nickel and 19-23% weight of chrome;
- inserting, into holes of the tube plate, tubes of low carbon furitic stainless steel having 17-18.5% by weight of chromium, such that their ends reach an intermediate level of the second overlay;
- and welding the ends of the tubes to the second overlay by means of inert gas welding with or without filling metal.
Priority Claims (1)
Number |
Date |
Country |
Kind |
83 11261 |
Jul 1983 |
FRX |
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Parent Case Info
This is a Division of application Ser. No. 682,082, filed July 5, 1984, now U.S. Pat. No. 4,583,588.
US Referenced Citations (4)
Foreign Referenced Citations (2)
Number |
Date |
Country |
2041810 |
Sep 1980 |
GBX |
2042117 |
Sep 1980 |
GBX |
Divisions (1)
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Number |
Date |
Country |
Parent |
682082 |
Jul 1984 |
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