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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546 MPa,主要由碳钢层贡献.
The TIG + MIG + MAG welding process was used for the plate-to-plate butt welding of the TA1 / X65 explosive metallurgy composite plate (the thickness of the cladding layer is 2 mm, the thickness of the X65 pipeline is 14 mm) Experiments were carried out to study the microstructure, interface element distribution, main phase, microhardness distribution and mechanical properties of the weld by OM, XRD, EDS, microhardness test and tensile test. Arc-shaped “U” groove design is conducive to transition layer Cu MIG welding, Cu-steel interface will not cause stress concentration and initiation of cracks. Deposited metal Ti, V, Cu and Fe have obvious partition, The phenomenon of melting is not obvious, and the transitional regions are connected by the solid solution phase. The Ti / V transitional interface is Ti-based solid solution, the V / Cu transitional interface is vanadium-based solid solution, and the Cu / Fe transitional interface is copper-based solid solution. The areas with higher weld hardness appeared at Ti / V transitional interface and V / Cu transitional interface with hardness up to 326 and 336 HV10, which had an impact on the ductility of transitional interface layer.The tensile strength of weld was up to 546 MPa, Carbon steel contribution.