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2015 №12 (09) DOI of Article
10.15407/tpwj2015.12.01 		2015 №12 (02)

The Paton Welding Journal 2015 №12


The Paton Welding Journal, 2015, #12, 2-7 pages
 

RESISTANCE WELDING OF SHAPE-MEMORY COPPER-ALUMINIUM ALLOY

B.E. Paton1, D.M. Kaleko1, S.N. Kedrovsky2, Yu.N. Koval2, I.V. Krivtsun1 And V.N. Slepchenko2


1E.O. Paton Electric Welding Institute, NASU. 11 Bozhenko Str., 03680, Kiev, Ukraine. E-mail: office@paton.kiev.ua
2G.V. Kurdyumov Institute for Metal Physics, NASU. 36 Acad. Vernadsky Blvd., 03680, Kiev, Ukraine. E-mail: metall@imp.kiev.ua
 
 
Abstract
Cu-Al based shape-memory alloys (SMA) are an attractive replacement for expensive SMA of Ti-Ni system in fasteners, thermal automatic device activators, and superelastic elements of instrumentation. Therefore, the problem of joining the latter in different combinations with similar material and other structural metals has become urgent. The main requirement to such joints, in addition to strength, is preservation of functional characteristics, namely temperature range of shape restoration at thermoelastic martensite transformation. Weldability of Cu-Al alloys in the form of 0.05 mm thick foil, 0.3 mm thick strip and 1 mm diameter wire by spot and butt capacitor-type welding was studied, and it was shown that at pulsed welding heating the functional characteristics in the welding area are preserved in joints with rupture strength, corresponding to the respective base metal strength. Metallographic examination showed recrystallization of the initial coarse-crystalline metal in welding heating zone with formation of fine-crystalline structure, both in the solid-state joints and around the cast nugget in spot welding of 0.3 mm strip. Sound butt joints of SMA and copper wire were produced. 5 Ref., 1 Table, 10 Figures.
 
Keywords: shape-memory alloys, copper-aluminium alloys, resistance spot welding, resistance butt welding, thermoelastic martensite transformation
 
 
Received:                01.09.15
Published:               21.01.16
 
 
References
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  2. Gunter, V.E., Khodorenko, V.N., Yasenchuk, Yu.F. et al. (2006) Titanium nickelide. Medical material of new generation. Tomsk: MITs.
  3. Otsuka, K., Shimizu, K. (1979) Shape memory effects in alloys. Moscow: Nauka.
  4. Paton, B.E., Kaleko, D.M., Shevchenko, V.P. et al. (2006) Weldability of shape-memory alloys of Ni-Ti system. The Paton Welding J., 5, 2-7.
  5. Moravsky, V.E., Vorona, D.S. (1985) Technology and equipment for spot and capacitor-discharge projection welding. Kiev: Naukova Dumka.