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Qualification of electron-beam welded joints between copper and stainless steel for cryogenic application

Lusch, C.; Borsch, M.; Heidt, C.; Magginetti, N.; Sas, J.; Weiss, K.-P.; Grohmann, Steffen

Joints between copper and stainless steel are commonly applied in cryogenic systems. A relatively new and increasingly important method to combine these materials is electron-beam (EB) welding. Typically, welds in cryogenic applications need to withstand a temperature range from 300K down to 4 K, and pressures of several MPa. However, few data are available for classifying EB welds between OFHC copper and 316L stainless steel. A broad test program was conducted in order to qualify this kind of weld. The experiments started with the measurement of the hardness in the weld area. To verify the leak-tightness of the joints, integral helium leak tests at operating pressures of 16MPa were carried out at roomand at liquid nitrogen temperature. The tests were followed by destructive tensile tests at room temperature, at liquid nitrogen and at liquid helium temperatures, yielding information on the yield strength and the ultimate tensile strength of the welds at these temperatures. Moreover, nondestructive tensile tests up to the yield strength, i.e. the range in which the weld can be stressed during operation, were performed. Also, the behavior of the weld upon temperature fluctuations between room- and liquid nitrogen temperature was tested. ... mehr

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Volltext §
DOI: 10.5445/IR/1000052886
DOI: 10.1088/1757-899X/102/1/012017
Zitationen: 3
Zugehörige Institution(en) am KIT Institut für Technische Thermodynamik und Kältetechnik (ITTK)
Institut für Technische Physik (ITEP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2015
Sprache Englisch
Identifikator ISSN: 1757-8981, 1757-899X
KITopen-ID: 1000052886
HGF-Programm 37.06.02 (POF III, LK 01)
Erschienen in IOP conference series / Materials science and engineering
Band 102
Heft 1
Seiten 012017/1-8
Schlagworte Electron-beam welding, copper, stainless steel, cryogenic application, 316L, mechanical test, hardness, liquid nitrogen, liquid helium
Nachgewiesen in Scopus
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