对 CO2 药芯焊丝的焊接工艺进行了研究 .分析了电弧电压、电弧电流、焊接速度对药芯焊丝焊接工艺的影响 ,并对 CO2 药芯焊丝和实芯焊丝的性能作了部分对比试验 .研究表明 :CO2 药芯焊丝的焊缝成形、焊缝的熔合、焊接质量明显好于 CO2 ...对 CO2 药芯焊丝的焊接工艺进行了研究 .分析了电弧电压、电弧电流、焊接速度对药芯焊丝焊接工艺的影响 ,并对 CO2 药芯焊丝和实芯焊丝的性能作了部分对比试验 .研究表明 :CO2 药芯焊丝的焊缝成形、焊缝的熔合、焊接质量明显好于 CO2 实芯焊丝 .展开更多
TSG19A型受电弓应用于CRH380A高速动车组上,近期陆续出现多起上框架肘节焊缝熔合线处开裂现象。针对T S G19A型受电弓肘节部位焊缝熔合线处开裂问题,通过优化焊接结构和接头形式,将工件最大应力部位设置在原材料上,消除了应力集中现象,...TSG19A型受电弓应用于CRH380A高速动车组上,近期陆续出现多起上框架肘节焊缝熔合线处开裂现象。针对T S G19A型受电弓肘节部位焊缝熔合线处开裂问题,通过优化焊接结构和接头形式,将工件最大应力部位设置在原材料上,消除了应力集中现象,并有效降低了焊缝部位的最大应力和焊接工艺难度,可有效解决开裂问题。展开更多
Numerical simulation and experimental methods were used to investigate the effects of weld penetration on tensile properties of 2219 aluminum alloy tungsten inert gas(TIG)welded joints.The results show that when other...Numerical simulation and experimental methods were used to investigate the effects of weld penetration on tensile properties of 2219 aluminum alloy tungsten inert gas(TIG)welded joints.The results show that when other geometric parameters are consistent,within a certain range,the deeper the weld penetration of the capping weld is,the lower the tensile strength of the j oint is.The deeper weld penetration of the capping weld can cause the more concentrated stress at the weld toe and the joint is more likely to crack accordingly.Based on necessary assumptions,a model for analyzing the mathematical relation between the weld penetration of the capping weld and the tensile strength of the joint was proposed to validate the experimental results. The decrease of weld penetration of capping weld can be controlled by decreasing welding current,helium content or increasing welding voltage.展开更多
文摘TSG19A型受电弓应用于CRH380A高速动车组上,近期陆续出现多起上框架肘节焊缝熔合线处开裂现象。针对T S G19A型受电弓肘节部位焊缝熔合线处开裂问题,通过优化焊接结构和接头形式,将工件最大应力部位设置在原材料上,消除了应力集中现象,并有效降低了焊缝部位的最大应力和焊接工艺难度,可有效解决开裂问题。
基金Project(U1637601)supported by the Joint Funds of the National Natural Science Foundation of China
文摘Numerical simulation and experimental methods were used to investigate the effects of weld penetration on tensile properties of 2219 aluminum alloy tungsten inert gas(TIG)welded joints.The results show that when other geometric parameters are consistent,within a certain range,the deeper the weld penetration of the capping weld is,the lower the tensile strength of the j oint is.The deeper weld penetration of the capping weld can cause the more concentrated stress at the weld toe and the joint is more likely to crack accordingly.Based on necessary assumptions,a model for analyzing the mathematical relation between the weld penetration of the capping weld and the tensile strength of the joint was proposed to validate the experimental results. The decrease of weld penetration of capping weld can be controlled by decreasing welding current,helium content or increasing welding voltage.
