通过力学性能测试及微观组织分析研究了传统中板及低碳、Nb-Ti微合金化Q345R热连轧压力容器板在手工焊、气保焊及埋弧焊3种焊接工艺下的接头性能,测定了不同焊接工艺下接头各区域的硬度分布,评价了Q345R接头力学性能。试验结果表明,连轧Q345R板焊接接头具有更好的综合性能,其接头冲击韧性明显好于传统中板,粗晶区淬硬程度低。连轧板良好的性能来源于TMCP工艺下碳当量降低及Nb-Ti微合金化处理改善了基体及接头的微观组织。
By the mechanics test and microstructure observation,the joint weld properties of Q345R pressure vessels steel plates produced by conventional process and hot continuous rolling were investigated under different welding techniques such as shielded metal arc welding,gas metal arc welding and submerged metal arc.The hardness distribution measurements on the different welded specimens were conducted and the mechanical performance of joint weld for the steels was evaluated.The results show that the synthetics properties of continuous rolling Q345R joint weld are excellent and its impact toughness is higher than conventional process.The degree of hardening for coarsen zone of continuous rolling joint weld is least obviously.Better properties of joint weld come from microstructure refining as low carbon and Nb-Ti microalloyed design plus TMCP technology adoption.
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