Study on welding process parameters of narrow swing automatic welding of CV thick plate in nuclear power plant

核电CV厚板窄间隙摆动自动焊接工艺参数研究 Study on welding process parameters of narrow swing automatic welding of CV thick plate in nuclear power plant 陈鹏 CHEN Peng 1 first-author 刘一搏 LIU Yibo 1 2 王亚峰 WANG Yafeng 1 孙清洁 SUN Qingjie 1 2 哈尔滨工业大学(威海)山东省特种焊接技术重点实验室 哈尔滨工业大学(威海)山东省特种焊接技术重点实验室 Shandong Provincial Key Laboratory of Special Welding Tech nology,Harbin Institute of Technology at Weihai Shandong Provincial Key Laboratory of Special Welding Tech nology,Harbin Institute of Technology at Weihai 哈尔滨工业大学先进焊接与连接国家重点实验室 哈尔滨工业大学先进焊接与连接国家重点实验室 State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology CAP1400核电站CV模块钢板(SA-738 Gr.B)窄间隙自动焊具有填充量小、焊接效率高的特点。首先采用特制的窄间隙焊枪开展单一变量试验,研究窄间隙坡口内摆动速度、侧壁停留时间、焊接电流、焊接速度和焊丝尖端到侧壁距离等参数对焊缝熔深、余高和侧壁熔深的影响规律。结果表明,在窄间隙坡口内,摆动速度对焊缝熔深的影响最大;焊接电流和焊接速度对余高影响最大;焊丝尖端到侧壁距离对侧壁熔深影响最大,并确定了最优焊接参数范围。其次采用最优参数对试板进行焊接并测试其力学性能,结果表明,其拉伸性能及冲击性能均高于母材要求值。这为后续进一步进行CV窄间隙自动焊工艺工程应用研究提供了理论基础和参考。 CAP1400 nuclear power plant CV module steel plate（SA-738 Gr.B） has a small gap and automatic welding with a small filling volume and high welding efficiency. First a single variable experiment is conducted to study the influence of parameters such as swing speed,sidewall dwell time,welding current,welding speed,and the distance from the tip of the wire to the sidewall on the weld penetration depth,residual height,and sidewall penetration depth in a narrow gap groove,with a special narrow gap welding gun. The results show that in a narrow gap bevel,the swing speed has the greatest effect on the penetration of the weld;the welding current and the welding speed have the greatest effect on the remaining height;the distance from the tip of the wire to the side wall has the largest effect on the penetration,and determined the optimal welding parameter range. Second,the optimal parameters are used to weld the test plate,and the test plate is tested for mechanical proper-ties. The results show that the tensile properties and impact properties are higher than the requirements of the base metal.The study provides theoretical basis and reference for the further engineering application research of CV narrow gap automatic welding process. SA-738 Gr.B 焊接工艺参数 窄间隙坡口 摆动电弧 SA-738 Gr.B welding process parameters narrow gap groove swing arc TG409;TM623 2022-03-08 3 50