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TA1/X65钛-钢复合板焊接工艺及焊缝组织和性能

腊月:快赢彩票网    发布时间:2017-12-13 点击量:
TA1/X65钛-钢复合板焊接工艺及焊缝组织和性能INVESTIGATION ON THE WELDING PROCESS AND MICROSTRUCTURE AND MECHANICAL PROPERTY OF BUTT JOINTS OF TA1/X65 CLAD PLATES 采用 TIG+MIG+MAG 焊接工艺对 TA1/ X65 爆炸冶金复合板(复层 Ti 厚 2 mm, 基层 X65 管线钢厚 14 mm)试件进行了以 V/Cu 作为过渡填充金属的板-板对接焊实验. 利用 OM, XRD, EDS 面扫描, 显微硬度测试和拉伸实验, 研究了焊缝区组织特征、界面元素分布、主要物相、显微硬度分布及焊缝力学性能. 结果表明, 圆弧状“U”型坡口设计有利于过渡层 Cu 的 MIG 焊接, 在 Cu-钢界面不会引起应力集中而萌生裂纹. 熔敷金属 Ti, V, Cu 和 Fe 有明显分区, 扩散互融现象不明显, 各区域间由固溶体相过渡连接, Ti/V 过渡界面组织结构为钛基固溶体, V/Cu 过渡界面组织结构为钒基固溶体, Cu/Fe 过渡界面组织结构为铜基固溶体. 焊缝硬度较高区域出现在 Ti/V 过渡界面和 V/Cu 过渡界面处, 硬度值达 326 和 336 HV10, 对过渡界面层塑韧性有一定影响. 焊缝抗拉强度可达 558 MPa, 主要由碳钢层贡献.  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 558 MPa, mainly of that of the carbon steel was obtained.  全文下载:

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