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2019 №04 (03) DOI of Article
10.15407/as2019.04.04
2019 №04 (05)

Automatic Welding 2019 #04
Avtomaticheskaya Svarka (Automatic Welding), #4, 2019, pp. 25-29
 
Application of ultrafine nickel powder for diffusion joining of titanium to stainless steel

A.V. Lyushinskii
JSC «Ramenskoje Instrument Design Bureau». 2 Gurjeva Str., 140103, RF. E-mail: nilsvarka@yandex.ru

The paper deals with the features of joining titanium alloy PT-3V to steel 08Kh18N10T by diffusion welding with application of an interlayer of ultrafine nickel powder, produced by thermal decomposition of nickel formate Ni(COOH)2+2H2O. Comparison of the structures of welded joints of these materials for presence of intermetallic phases in welding without interlayers and with a nickel interlayer at different mode parameters was performed. Application of ultrafine nickel powder at temperatures of 965 and 890 °C leads to formation of a continuous layer of solid intermetallics. At the temperature of 790 °C the diffusion zone has a multilayer structure, differing from the microstructure of steel-titanium joint, produced without the nickel interlayer. Mechanical rupture testing of the welded joints showed that sufficient strength properties are achieved at application of an interlayer of ultrafine nickel powder at lower temperature and pressure, preventing intensive growth of intermetallics. The highest values of ultimate strength were achieved at welding temperature of 760 – 790 °C and were equal to 346 MPa on average. 13 Ref., 3 Tabl., 4 Fig.
Keywords: diffusion welding, interlayer, ultrafine powder

Received: 31.01.2019
Published: 04.04.2019

References

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