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INVESTIGATION ON THE WELDING PROCESS AND MICROSTRUCTURE AND MECHANICAL PROPERTY OF BUTT JOINTS OF TA1/X65 CLAD PLATES |
Zongyue BI1,2(),Jun YANG1,2,Haizhang LIU1,2,Wanpeng ZHANG1,2,Yaobin YANG1,2,Lei TIAN1,2,Xiaojiang HUANG1,2 |
1 National Engineering Technology Research Center for Petroleum and Natural Gas Tubular Goods, Baoji 721008, China. 2 Steel Pipe Research Institute of Baoji Petroleum Steel Pipe Co., Ltd., Baoji 721008, China |
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Cite this article:
Zongyue BI,Jun YANG,Haizhang LIU,Wanpeng ZHANG,Yaobin YANG,Lei TIAN,Xiaojiang HUANG. INVESTIGATION ON THE WELDING PROCESS AND MICROSTRUCTURE AND MECHANICAL PROPERTY OF BUTT JOINTS OF TA1/X65 CLAD PLATES. Acta Metall Sin, 2016, 52(8): 1017-1024.
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Abstract Titanium/steel clad material with excellent mechanical properties and corrosion resistance has important application in storage and transportation equipment of oil and gas. Due to the metallurgical incompatibility of titanium and steel, the mechanical properties of weld joint would completely lose when the brittle intermetallic phase TixFey and TiC appeared in the fusion welding process. Therefore, the gas tungsten arced welding (TIG), metal inert-gas welding (MIG) and metal active-gas welding (MAG) with V/Cu composite filler metals for butt joint in this study was carried out on TA1/X65 pipeline steel clad plates with thickness 16 mm ( titanium cladding with thickness 2 mm, X65 pipeline steel with thickness 14 mm). The microstructure, interface element distribution, main phase, microhardness distribution on cross section and mechanical properties of butt welds were investigated by using OM, XRD, EDS element mapping, microhardness and tensile test. The results indicate that the design of “U-type” circular groove advantageous to the MIG of Cu transition-metals, because of the “U-type” circular groove does not cause stress concentration and crack initiation. The deposited metal of Ti, V, Cu and Fe have obvious zoning, interdiffusion melting phenomenon is not severe, and by using solid solution phases to transit zonings of deposited metal. The microstructure of Ti and V transition interface was composed of Ti-based solid solution, the microstructure of V and Cu transition interface was composed of V-based solid solution, and the microstructure of Cu and Fe transition interface was composed of Cu-based solid solution. The high hardness region of butt weld cross section appeared in the Ti/V transition-interface and V/Cu transition-interface, the hardness value was respectively 326 HV10 and 336 HV10, and weakened the ductility of transition interfacial layer. A joint with a tensile strength of 546 MPa, mainly of that of the carbon steel was obtained.
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Received: 30 November 2015
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