STUDY ON STRUCTURE AND MECHINCAL PROPERTIES OF WELD FOR HARDFACING BY RESISTANCE SEAM WELDING
Present paper studies on structure and mechanical properties of metal weld on a C45 shaft by resistance seam welding with C70 steel wire. Nine experiments with different welding parameters were performed to evaluate the welded structure as well as mechanical properties. ARO 72500 welding machine combined with fixtures was used in the experiemental process. Results show that welded microstructure included needle-shaped martensite and rest austenite. In addition, it is observed that bonding between welded and parent metal, and between welded layers after each electric pulse is quite stable through macrostructure. Bonding strength of welding layer with base metal of the shaft reached about 80 ÷ 95% tensile strength of base metal (488N/mm2); while average hardness of all welding specimens was quite large ensuring the hardness requirement of recovery details (45÷55HRC). Besides, wear resistance of welding samples was 1.24 ÷ 1.44 times higher than that of the new shaft made from C45 steel with high-frequency hardening. From obtained results, it is confirmed that the quality of the resistance seam welding method for recovering the shaft with C70 steel wire is relatively good and can be applied to other materials in the future
Hoàng Tùng (2006), Công nghệ phun phủ và ứng dụng, NXB Khoa học & Kỹ thuật, Hà Nội.
L. Pawlowski, 2008, The Science and Engineering of Thermal Spray Coatings, JohnWiley&Sons, Ltd. ISBN: 978-0-471-49049-4.
Клименко, Ю.В. Электроконтакная наплавка, Ю.В. Клименко. - М.: Металлургия, 1978. - 128 с.
M.Z. Nafikov (2009), A method for the determination of the plastic deformation resistance of filler wires in electric resistance surfacing, Welding International, Vol. 23, No. 11, 861–864.
M.Z. Nafikov (2015), Formalized description of the process of formation of the welded joint in resistance welding of wires, Welding International, Vol. 29, No. 6, 466–470, DOI: 10.1080/09507116.2014.941670.
M.Z. Nafikov (2016), Reconditioning of shafts by electric resistance welding of two steel wires, Welding International, Vol. 30, No. 3, 236–243, ISSN: 0950-7116.
V.A. Du brovskii, V.V. Bulychev and A.I. Ponomarev (2003), Preventing splashing in electrical resistance surfacing with a wire of 40Cr13 steel, Welding International, vol. 17, No 11, 895-898.
Y.u. V Klimenko (1981), Electrical resistance surfacing of metals with melting of the boundary layer. Svar Proiz. 1981; (8): 20–21
IWE (2015), International Welding Engineer, Copyright by GSI SLV Duisburg.
ARO (2003), User’s Manua Mos Machines Sing-Phase seam whel , ARO 1, avenue de Tours – 72500 Chateau-Du-Loir – France.
TCVN 1766-75, Thép các bon kết cấu chất lượng tốt, Tiêu chuẩn Quốc Gia Việt Nam.
TCVN 1767 – 75, Thép đàn hồi - Mác thép và yêu cầu kỹ thuật, Tiêu chuẩn Quốc Gia Việt Nam.