Search academic texts

Information × Registration Number 0213U006313, 0110U001996 , R & D reports Title Development of filler metals for capilarity and noncapilarity brazing and development technology prossesis using this materials. popup.stage_title Head Khorunov Victor Fedorovich, Registration Date 28-03-2013 Organization E.O. Paton Electric Welding Institute of the National Academy of Sciences of Ukraine popup.description2 1. Structure, melting and spreading ranges were investigated under conditions of arc heating of alloys of the Cu-Mn-Ni-Si and Cu-Sn-Mn systems over a wide range of concentrations. Based on the investigation results, compotions of alloys were selected for the use az brazing filler alloys in the form of flux-cored wires. The technology was developed for manifacture of different-diametr (up to 1.6 mm) flux-cored wires (with copper braiding) of above systems, and brazingparameters were optimized by using different arc heating sources. Plasma-arc heating was considered to be most promising. Structural perculiarities were revealed, and strength characteristics of the joints on steel 08yu made by arc brazing using filler alloys of the Cu-Mn-Ni-Si and Cu-Sn-Mn systems were determined. The main distinctive feature of structure of these joints is that in the case of using filler alloy of the Cu-Mn-Ni-Si system a silicide interlayer is revealed at the joint interface. Strength of the joints in this case grows with increase in the manganese content (240 MPa at 10 wt. % Mn, and 315 MPa at 24 wt. % Mn). When using filler alloy of the Cu-Sn-Mn system, strength of the joints decreases with increase in the manganese content (355 MPa at 2 wt. %, and 296 MPa at 6 wt. %). 2. The processes of chemical interaction in a heterogeneous system consisting of a reactive flux of salt K,Al,Si system and aluminium, occuring during high-temperature brazing, were investigated. It was shown that the total addition of potassium hexasilicofluoride and aluminium fluoride to a low-melting point mixture of potassium fluoroaluminites allows generating the maximal amount of free silicon as a result of interaction with aluminium. The technologies were developed fow low-temperature synthesis of flux and manufacture of flux-cored wires with a flux core, exebiting the improved wetting cnaracteristics and capillary properties in brazing of aluminium alloys with low magnesium content, compared to the known analogues. The flux-cored wires featured good technological compatibility under conditions of DC arc brazing of aluminium sheets to each other and to stainless steel. The resulting overlapped brazed joints has tensile strength equal to that of aluminium. Product Description popup.authors Воронов Віталій В'ячеславович Зволінський Ігор Володимирович Ковальчук Петро Григорович Максимова Світлана Василівна Сабадаш Олег Михайлович Фридман Марк Якович popup.nrat_date 2020-04-02 Close