2019 №07 (04) DOI of Article
2019 №07 (06)

Automatic Welding 2019 #07
Avtomaticheskaya Svarka (Automatic Welding), № 7, 2019 г., с.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


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