共查询到20条相似文献,搜索用时 125 毫秒
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《机械制造文摘:焊接分册》2010,(3):7-10
5A90铝锂合金激光填丝焊焊缝金属组织特征分析,中国低活马氏体钢熔化焊接头硬度与微观组织,TiAl/Ti60电子束焊接接头组织及性能,镀锌薄板TIG拼焊的焊缝组织及成形性能,AZ31B镁合金氩弧焊接头性能分析…… 相似文献
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铝及其合金在汽车工业的应用中具有轻量化、节能减排、改善环境、提高汽车平稳性和安全性等特点。铝及其合金熔化焊存在焊缝易产生气孔,焊接接头易软化等缺陷。讨论了激光-电弧复合焊、激光拼焊、搅拌摩擦焊在汽车用铝及其合金焊接的应用和特点。 相似文献
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由于陶瓷增强相与金属基体合金性能的巨大差异,造成铝基陶瓷增强复合材料的焊接困难较大.在各种焊接方法中,钎焊和扩散焊是铝基陶瓷增强复合材料焊接比较常用的方法.本文研究了钎料和中间层合金与铝基复合材料的润湿机理,介绍了颗粒增强铝复合材料的超声波钎焊、真空钎焊、无夹层液相扩散焊、冲击扩散焊和瞬时液相扩散连接等焊接新工艺,对这些焊接工艺的原理与特点进行了探讨. 相似文献
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综述了镁合金的应用与性能,焊接技术已成为制约其应用的关键所在。介绍了镁合金的焊接研究现状,阐述了镁合金的钨极惰性气体保护焊、熔化极惰性气体保护焊、搅拌摩擦焊、电子束焊、激光焊、电阻点焊等焊接工艺的特点,并对镁合金的焊接研究进行了展望。 相似文献
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《Science & Technology of Welding & Joining》2013,18(5):418-425
AbstractA lot of welding fumes are generated due to the evaporation of magnesium during welding aluminium alloys using Al–Mg welding wires. Fume formation is mainly evaluated by two methods. An average formation rate can be calculated by collecting the fumes formed during a constant welding period. The other one is carried out by observing the droplet with a high speed video. However, these two methods become invalid in quantitatively evaluating the evaporation rate of magnesium in peak or background period during pulsed metal inert gas arc welding. In this paper, a novel method was developed to evaluate the evaporation rate and flux of magnesium in the peak period. First, a robot welding system was used to produce a series of droplets by shutting down the peak current at different times in the peak period. Second, the magnesium contents of these droplets were analysed. Finally, the evaporation rate and flux of magnesium in the peak period were calculated. 相似文献
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The article presents a structural analysis of joints of as-cast magnesium alloys created using three joining methods: friction stir welding, CO2 laser welding and electric arc welding in inert gas shielding using tungsten electrode (TIG). The macro- and microstructures of the butt joints have been evaluated using an optical microscope with a digital image recording system. Two types of magnesium alloys were used in the research: AZ91 and AM-Lite, the main alloying elements of which are zinc and aluminium. The starting material consisted of cast ingots milled to a specific dimension and then cut into plate samples with a thickness of 3 mm. The subsequent analysis showed that it is possible to achieve high-quality joints of magnesium alloys. However, trace quantities of pores have also been found. 相似文献
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镁合金的焊接方法及其工艺要素 总被引:4,自引:0,他引:4
介绍了镁合金焊接的主要问题,综述了有可能应用于镁合金焊接的各种焊接方法、工艺要素及其研究现状,其中包括钨极惰性气体保护焊、熔化极惰性气体保护焊、激光焊、电子束焊、摩擦焊、电阻点焊、钎焊等,展望了有良好应用前景的焊接方法与研究方向。 相似文献
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压铸镁合金激光焊气孔形成原因的实验研究 总被引:3,自引:0,他引:3
压铸镁合金因含气量高而使得激光焊接气孔问题非常突出,为实现压铸镁合金的低气孔率焊接技术,通过对母材固态加热前后气孔特征参数、密度变化的分析以及焊前除氢后施焊与不除氢施焊气孔倾向的比较,研究了压铸镁合金中气体来源的特点及气孔形成过程.结果表明,母材中同时含有分子氢和原子氢,以高压气孔形式存在的分子氢以及以过饱和固溶形式存在的原子氢均是导致压铸镁合金激光焊产生大量气孔的原因.而向焊缝中引入Zr元素可以显著降低气孔倾向,但Zr的作用机理还有待于深入研究. 相似文献
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镁合金激光焊接气孔问题的实验研究 总被引:2,自引:1,他引:1
对变形镁合金AZ31B、AZ80A,砂铸镁合金AM60B、AZ91D及压铸镁合金AM50A激光焊接气孔倾向进行研究.研究表明:变形镁合金激光焊气孔倾向很小,在较宽的焊接工艺参数范围内均能得到无气孔的焊缝. 砂铸镁合金AM60B及AZ91D激光焊时气孔对气体保护条件非常敏感,在侧吹气体保护角度及流量选择不合适时气孔率非常高,在优化的气保护条件下可得到气孔率较低的焊缝.而压铸镁合金AM50激光焊缝中气孔问题非常突出,调整工艺参数无法解决气孔问题,焊接过程中的加热及添加填充材料可以在一定程度上减少气孔. 相似文献