Cold Metal Transfer technology has revolutionized the welding of dissimilar metals and thicker materials by producing improved weld bead aesthetics with controlled metal deposition and low heat-input. In this study, t...Cold Metal Transfer technology has revolutionized the welding of dissimilar metals and thicker materials by producing improved weld bead aesthetics with controlled metal deposition and low heat-input. In this study, the process, weld combinations, laser-CMT hybrid welding and applications of CMT welding are critically reviewed. Microstructure and other weld characteristics have been discussed at length for various base metal combinations. Particularly, the welding of aluminium and steel with better results has been possible with CMT Welding. The results reviewed in this article indicate that the CMT-Laser hybrid welding is more preferable to Laser or Laser hybrid welding. CMT welding has found applications in automobile industries, defence sectors and power plants as a method of additive manufacturing.展开更多
在长输油气管道的焊接施工中,管道的根部打底焊接质量非常重要。与过去传统的根焊相比,应用CMT(cold metal transfer)冷金属过渡技术,在管道焊接尤其是管道的外部根焊上,焊接质量和焊接效率得到了非常大的提升,可以获得良好的焊接效果...在长输油气管道的焊接施工中,管道的根部打底焊接质量非常重要。与过去传统的根焊相比,应用CMT(cold metal transfer)冷金属过渡技术,在管道焊接尤其是管道的外部根焊上,焊接质量和焊接效率得到了非常大的提升,可以获得良好的焊接效果。介绍了CMT系统的组成以及技术特点,应用结果表明该方案具有可行性。展开更多
针对增材制造过程中形成的缺陷会对工件造成不可逆的影响,分析了冷金属过渡(Cold metal transfer,CMT)增材制造过程的焊接电流信号和焊接电压信号,提出了一种基于时间序列算法的CMT增材制造缺陷在线监测方法。设置不同的焊接工况,收集...针对增材制造过程中形成的缺陷会对工件造成不可逆的影响,分析了冷金属过渡(Cold metal transfer,CMT)增材制造过程的焊接电流信号和焊接电压信号,提出了一种基于时间序列算法的CMT增材制造缺陷在线监测方法。设置不同的焊接工况,收集良好组和缺陷组的原始焊接电流和焊接电压信号,使用SAX(Symbolic aggregate approximation)算法对数据进行预处理。使用随机森林模型对数值型数据再分类,达到实时监测的效果;同时为突出SAX算法的优越性,设置对比试验组,将原始的焊接电流数据直接放入随机森林模型进行分类。结果表明,原始焊接电流组的测试集准确率为80%,SAX算法数据预处理组的测试集准确率为96%。展开更多
文摘Cold Metal Transfer technology has revolutionized the welding of dissimilar metals and thicker materials by producing improved weld bead aesthetics with controlled metal deposition and low heat-input. In this study, the process, weld combinations, laser-CMT hybrid welding and applications of CMT welding are critically reviewed. Microstructure and other weld characteristics have been discussed at length for various base metal combinations. Particularly, the welding of aluminium and steel with better results has been possible with CMT Welding. The results reviewed in this article indicate that the CMT-Laser hybrid welding is more preferable to Laser or Laser hybrid welding. CMT welding has found applications in automobile industries, defence sectors and power plants as a method of additive manufacturing.
文摘在长输油气管道的焊接施工中,管道的根部打底焊接质量非常重要。与过去传统的根焊相比,应用CMT(cold metal transfer)冷金属过渡技术,在管道焊接尤其是管道的外部根焊上,焊接质量和焊接效率得到了非常大的提升,可以获得良好的焊接效果。介绍了CMT系统的组成以及技术特点,应用结果表明该方案具有可行性。
文摘针对增材制造过程中形成的缺陷会对工件造成不可逆的影响,分析了冷金属过渡(Cold metal transfer,CMT)增材制造过程的焊接电流信号和焊接电压信号,提出了一种基于时间序列算法的CMT增材制造缺陷在线监测方法。设置不同的焊接工况,收集良好组和缺陷组的原始焊接电流和焊接电压信号,使用SAX(Symbolic aggregate approximation)算法对数据进行预处理。使用随机森林模型对数值型数据再分类,达到实时监测的效果;同时为突出SAX算法的优越性,设置对比试验组,将原始的焊接电流数据直接放入随机森林模型进行分类。结果表明,原始焊接电流组的测试集准确率为80%,SAX算法数据预处理组的测试集准确率为96%。
