焊接工艺对10CrNiCu钢药芯焊丝熔敷金属组织和力学性能的影响

Effect of Welding Technology on Microstructure and Mechanical Properties of 10CrNiCu Steel Flux-cored Wire Deposited Metal

  • 摘要: 在焊接过程中,焊接工艺参数对熔敷金属的组织和力学性能有重要影响。为制定合理的焊接工艺,系统研究了层间温度及焊接热输入对船用10CrNiCu钢药芯焊丝熔敷金属组织和力学性能的影响。通过金相显微镜和透射电子显微镜对熔敷金属组织进行了表征,利用拉伸、冲击试验机对熔敷金属力学性能进行了评价。结果表明,层间温度对熔敷金属组织和力学性能的影响不明显;随着焊接热输入的不断增加,熔敷金属的抗拉强度、屈服强度逐渐降低,冲击吸收能量先略有增加后显著降低;采用该10CrNiCu钢药芯焊丝进行焊接时,应控制层间温度在90~160 ℃内、热输入在12~14 kJ/cm内,在此焊接条件下,焊接接头具有优异的强韧性匹配。

     

    Abstract: In the cause of welding, the welding parameters have an impact effect on the microstructure and mechanical properties of deposited metal. To design suitable welding procedure, the effects of interpass temperature and welding heat input on the microstructures and mechanical properties of deposited metals of 10CrNiCu steel flux-cored wires are systematically studied. The microstructures of the deposited metals are characterized by optical microscopy and transmission electron microscopy, and the mechanical properties of the deposited metals are evaluated by tensile and impact testing machines. Results show that the effects of interpass temperature on microstructures and mechanical properties of deposited metals are not obvious. With the increase of welding heat input, the tensile and yield strengths of the deposited metals decrease slowly, and the impact energy absorbed increases slightly first and then decreases obviously. When the 10CrNiCu steel flux-cored wire is used, the interpass temperature should be controlled in the range of 90-160 ℃,and the heat input in the range of 12-14 kJ/cm. Under the above welding conditions, the welded joint can have good match of strength and toughness.

     

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