随着我国轨道交通行业的飞速发展,车体减重对于节省能源意义重大。采用CMT冷金属过渡焊接技术对4-0.8 mm SUS301L-MT不锈钢搭接接头进行了工艺研究,获得最优工艺参数;同时,对焊接接头进行了宏观形貌、微观组织观察、力学性能以及变形测...随着我国轨道交通行业的飞速发展,车体减重对于节省能源意义重大。采用CMT冷金属过渡焊接技术对4-0.8 mm SUS301L-MT不锈钢搭接接头进行了工艺研究,获得最优工艺参数;同时,对焊接接头进行了宏观形貌、微观组织观察、力学性能以及变形测量。结果表明,在最优工艺参数下,焊缝成形美观,无明显缺陷,焊缝区组织主要为奥氏体柱状晶和枝晶状铁素体;焊接接头拉伸剪切最大力达到了22 234.42 N,硬度测试最小值均出现在焊缝区;焊后试板呈现波浪变形,最大Z方向变形量出现在试板边缘。展开更多
使用光学显微镜和装有背散射电子衍射（EBSD）系统的扫描电镜对6 mm SUS301L不锈钢板材激光-MIG复合焊接头进行了显微组织分析和背散射电子衍射（EBSD）相分析,并对对接头各区域在20、40、60℃的3.5 wt%Na Cl溶液中的动电位极化曲线和...使用光学显微镜和装有背散射电子衍射（EBSD）系统的扫描电镜对6 mm SUS301L不锈钢板材激光-MIG复合焊接头进行了显微组织分析和背散射电子衍射（EBSD）相分析,并对对接头各区域在20、40、60℃的3.5 wt%Na Cl溶液中的动电位极化曲线和腐蚀性能进行了检测分析。结果表明：母材和热影响区奥氏体基体上分布有较多板条状形变马氏体,焊缝为δ-Fe和奥氏体双相铸态组织,大量的Cr23C6弥散分布于熔合线附近的体心立方（BCC）结构相中;Na Cl溶液温度的升高明显恶化了焊缝和热影响区的耐腐蚀性能,母材的耐蚀性能反而提高。展开更多
This paper presents an experimental design approach to process parameter optimization for the laser lap welding of SUS301L austenitic stainless steels using Nd:YAG laser in order to reduce the welding deformations of ...This paper presents an experimental design approach to process parameter optimization for the laser lap welding of SUS301L austenitic stainless steels using Nd:YAG laser in order to reduce the welding deformations of the back of the welding seams while ensuring mechanical properties of welding joints.To determine the optimal laser-welding parameters,a set of mathematical models were developed relating welding parameters to each of the weld characteristics.These were validated both statistically and experimentally.In order to reduce experimental error and the number of specimens,the part of orthogonal experiments were used in this study.The quality criteria set for the weld to determine optimal parameters were the maximization of weld width and the minimization of weld depth.Laser power,welding speed,the laser irradiation angle,the focused distance and shield gas of 3.5kW,7.0m/min,70°,0mm and N2 with the flow of 30L/min,respectively,with a fiber diameter of 600μm were identified as the optimal set of process parameters.展开更多
文摘随着我国轨道交通行业的飞速发展,车体减重对于节省能源意义重大。采用CMT冷金属过渡焊接技术对4-0.8 mm SUS301L-MT不锈钢搭接接头进行了工艺研究,获得最优工艺参数;同时,对焊接接头进行了宏观形貌、微观组织观察、力学性能以及变形测量。结果表明,在最优工艺参数下,焊缝成形美观,无明显缺陷,焊缝区组织主要为奥氏体柱状晶和枝晶状铁素体;焊接接头拉伸剪切最大力达到了22 234.42 N,硬度测试最小值均出现在焊缝区;焊后试板呈现波浪变形,最大Z方向变形量出现在试板边缘。
基金Foundation of the Education Ministry for Returned Chinese Scholars,China for financially supporting this research under Contract No.20080003
文摘This paper presents an experimental design approach to process parameter optimization for the laser lap welding of SUS301L austenitic stainless steels using Nd:YAG laser in order to reduce the welding deformations of the back of the welding seams while ensuring mechanical properties of welding joints.To determine the optimal laser-welding parameters,a set of mathematical models were developed relating welding parameters to each of the weld characteristics.These were validated both statistically and experimentally.In order to reduce experimental error and the number of specimens,the part of orthogonal experiments were used in this study.The quality criteria set for the weld to determine optimal parameters were the maximization of weld width and the minimization of weld depth.Laser power,welding speed,the laser irradiation angle,the focused distance and shield gas of 3.5kW,7.0m/min,70°,0mm and N2 with the flow of 30L/min,respectively,with a fiber diameter of 600μm were identified as the optimal set of process parameters.
