Print

2019 №07 (04) DOI of Article
10.15407/as2019.07.05
2019 №07 (06)


Avtomaticheskaya Svarka (Automatic Welding), #7, 2019, pp. 28-32

Braze alloys of Cu-Mn-Ni-Si system and plasma-arc brazing of 08KP(boiling) steel

S.V. Maksymova, I.V. Zvolinskyy


E.O.Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazimir Malevich Str., 03150, Kyiv, Ukraine. E-mail: office@isi@nas.ua

The paper presents the results of high-temperature differential thermal analysis of braze alloys based on Cu-Mn-Ni-Si system, metallographic examination of brazed joints of 08kp (boiling) steel, made with application of plasma-arc heating. It is shown that at silicon alloying of Cu-Mn-Ni system the alloy melting temperature decreases and its wetting ability increases. X-Ray microanalysis revealed that brazed seam of 08kp (boiling) steel joints consists of copper-based solid solution and dispersed precipitates of a silicon-enriched phase. An iron-based phase with higher concentration of silicon and manganese forms on braze alloy – base metal interphase as a thin band (along the brazed seam), that is indicative of appearance of silicides of a complex composition. Brazed joint strength becomes higher with increase of nickel concentration in the alloy and is equal to 367 MPa. 9 Ref., 2 Tabl., 6 Fig.
Keywords: plasma-arc brazing, braze alloy, microstructure, spreading, solidus and liquidus temperature, strength

Received: 22.04.2019
Published: 10.06.2019

References

1. Knopp, N., Killing R. (2003) Hartlöten verzinkter Feinbleche mit dem Lichtbogen - sicher und wirtschaftlich (Teil 1). Solingen. Der Praktiker, 12, 366-371 [in German].
2. Füssel, U., Schetzsche, V., Sziesb, U., Husner, J. (2002) Plasmalöten mit stromführendem Zusatzwerkstoff. Ibid., 10, 336-340 [in German].
3. Kallabis, M., Schwankhart, G. (2002) Plazmatron-technologie im Karosseriebau. Blech Rohre Profile, 4, 42-45 [in German].
4. Pugh, C. (1970) Die Verwendung von Ni-Mn-Lotes fur Plattierlotungen sowie das Verfahren zum Herstellen eines solchen Lotes. FRG, Pat. 1284262 [in German].
5. Zhang, Q.K., Pei Yinyin, Weimin Long (2013) Investigations on formation mechanisms of brazing cracks at the austenitic stainless steel/filler metal brazing joint interfaces. Acta Metallurgica Sinica - Chinese Edition, 49(10), 1177-1184, October 2013, DOI: 10.3724/SP.J.1037.2013.00219 https://doi.org/10.3724/SP.J.1037.2013.00219
6. Davis, J.R. (Ed.) ASM Specialty Handbook. Copper and Copper Alloys, 276-302, DOI: 10.1361/caca P276.
7. Sejč, P., Kubíček, R. (2015) MIG brazing of 304L type stainless steel using CuSi3 and CuSi3MnAl brazing wire. Kovove Mater., 53, 365-375, DOI: 10.4149/km 2015 5 365. https://doi.org/10.4149/km_2015_5_365
8. Jyrki Miettinen. (2003) Thermodynamic description of the Cu-Mn-Ni system at the Cu-Ni side. Calphad 27(2), 147-152, June 2003. https://doi.org/10.1016/j.calphad.2003.08.003
9. (1997) State diagrams of binary metallic systems. Ed. by N.P. Lyakishev. In: Refer. Book, 3 Vol., Vol. 2. Moscow, Mashinostroenie [in Russian].