共查询到20条相似文献,搜索用时 93 毫秒
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汽车轻量化要求使得塑料产品在汽车行业内广泛应用,为了更好地满足塑料焊接件对焊缝强度和外观质量的要求,同时确保产品生产效率,文中选择汽车常用塑料PP进行焊接试验,研究了超声波焊接工艺参数对焊缝强度和外观质量的影响。结果表明,在一定的保压时间和焊接压力的情况下,焊接深度对汽车塑料件的焊缝强度和外观质量起决定性作用。当焊接压力为0.2 MPa,保压时间为2.0 s,焊接深度为1.8 mm 时,既能保证汽车塑料件的焊缝强度,又能满足外观质量的要求。这一结果对同样采用PP材料,并通过超声波焊接工艺制备的产品具有一定的指导意义。 相似文献
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一前言超声波焊接是热塑性塑料可采用的一种焊接工艺。由于该工艺对大批量生产具有加工速度快,可重复焊接的特性而得到普及。只有严格按照焊接工艺和材料特性设计焊接的接口,才能获得强度和外观均佳的焊接件。在此不介绍超声波焊接的原理,因有专著叙述。本文专门对焊接件的设计,特别是焊接连接部分的设计作实践性的介绍,操作者根据这些情况可避免产生次品。 相似文献
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通过对新型高强度耐候钢材进行焊接工艺试验,匹配合理的焊接材料,确定了合适的焊接工艺参数,并成功地应用于产品的焊接生产。 相似文献
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对玻纤增强聚对苯二甲酸丁二醇酯(PBT)复合材料进行平顶光束激光透射焊接工艺参数优化,选取焊接工艺参数(激光功率、焊接速度、玻纤含量)为影响因素,选择焊接质量(焊缝抗剪强度、焊缝宽度)为响应值。通过方差分析表和残差概率图验证了模型的准确性,并探究不同焊接工艺参数组合对焊接质量的交互影响。结果表明,增大激光功率、提高焊接速度和增加玻纤含量,焊缝抗剪强度先升高后下降;降低激光功率,提高焊接速度,焊缝宽度下降;增大玻纤含量,焊缝宽度先增大后减小。焊接速度对焊缝抗剪强度影响较大,玻纤含量对焊缝宽度影响较大。分别以最佳焊接质量和最小焊接成本为目标确定了玻纤复合材料的最优焊接工艺参数。 相似文献
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研究了惯性摩擦焊工艺参数对TC4钛合金焊接接头塑性的影响,结果表明,选择适当的焊接工艺参数可以使焊接接头在不降低强度的前提下,塑性有明显的提高,并得到了最佳焊接工艺参数。 相似文献
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搅拌摩擦焊的工艺参数对焊缝的表面成形和接头性能有着决定性的影响.以3mm铝合金2024板材对接焊为代表,通过大量的工艺参数试验,考查了多种焊接参数组合下的焊接接头质量,并在此基础上建立了工艺参数窗口.结果表明,在转速375~475r/min,焊接速度150~235mm/min的工艺参数窗口内,接头可以获得母材80%以上的抗拉强度.通过对拉伸断口的显微分析,发现靠搅拌区上方的材料塑性较好,搅拌区底部材料抗变形能力较差,接头区沿厚度方向分层严重. 相似文献
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This paper presents the results obtained by the optimization of laser bead on plate welding parameters for 3.5 kW cooled slab
laser using Taguchi technique. The trials were conducted on two different shielding gases 100% Nitrogen and 50% Nitrogen + 50%
Argon. The input process parameters such as beam power, travel speed and focal position are selected suitably in order to
obtain the desired output i.e., bead width and depth of penetration. The quality of the weld is evaluated by studying the
features of weld bead geometry. Grey relational analysis is applied to optimize the input parameters simultaneously considering
multiple output variables. In this investigation the nearest optimal solution which would improve the weld quality was found
out. Experimental trial on super austenitic stainless steel has been conducted to validate the optimized parameters. Further,
the optimized parameters were evaluated through the microstructural characterization and hardness measurements across the
weld zone. 相似文献
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通过建立基于多物理场耦合的焊点模型,得到焊接参数与焊点力学性能之间的窗口关系;对焊点进行车身综合工况下的受力分析,将焊点所受到的拉、剪力以及装配节拍要求的焊接时间作为约束条件,以最低焊接能耗为优化目标,提出了基于焊点“质量—能耗”均衡模型的焊接参数优化方法. 通过该优化方法,可以得到焊点力学性能及工业能耗的均衡优点. 结果表明,以某车型安全带固定座结构为算例,相比传统方法,优选的焊接参数在保证焊点性能要求的同时,还能使生产能耗降低超55%,这对保证质量及降低企业生产成本具有重要意义. 相似文献
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从机器人、双丝焊机、高精度变位机和自动化程控系统与焊接夹具等几方面对中部槽的机器人焊接系统设计方式进行了较为详细的介绍.探讨了双丝焊在中部槽焊接中的应用,并对中部槽双丝焊接工艺措施和焊接参数的选择进行试验研究.结果表明,采用有效的工艺对中部槽进行机器人自动焊接,具有焊缝内部质量优良、焊接速度快、自动化程度高等优点. 相似文献
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《Science & Technology of Welding & Joining》2013,18(6):509-516
AbstractA numerical modelling of the welding arc and weld pool is established for moving argon shielded gas tungsten arc welding to systematically investigate the effect of the active element oxygen and the welding parameters on the Marangoni convection and the weld shape using FLUENT software. The different welding parameters will change the temperature distribution and gradient on the pool surface, and affect the strength of Marangoni convection and the weld shape. Under high oxygen content, the weld depth/width (D/W) ratio substantially depends on the welding parameters. A high welding speed or large electrode gap (arc length) will make the weld D/W ratio decrease. The weld D/W ratio initially increases and then remains constant around 0·5 with the increasing welding current. When the oxygen content is lower, the weld D/W ratio decreases with the increasing welding current. However, the weld D/W ratio is not sensitive to the welding speed or electrode gap. The predicted weld D/W ratio agrees well with the experimental results. 相似文献
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Selection of process parameters has great influence on the quality of a welded connection. Mathematical modelling can be utilized in the optimization and control procedure of parameters. Rather than the well-known effects of main process parameters, this study focuses on the sensitivity analysis of parameters and fine tuning requirements of the parameters for optimum weld bead geometry. Changeable process parameters such as welding current, welding voltage and welding speed are used as design variables. The objective function is formed using width, height and penetration of the weld bead. Experimental part of the study is based on three level factorial design of three process parameters. In order to investigate the effects of input (process) parameters on output parameters, which determine the weld bead geometry, a mathematical model is constructed by using multiple curvilinear regression analysis. After carrying out a sensitivity analysis using developed empirical equations, relative effects of input parameters on output parameters are obtained. Effects of all three design parameters on the bead width and bead height show that even small changes in these parameters play an important role in the quality of welding operation. The results also reveal that the penetration is almost non-sensitive to the variations in voltage and speed. 相似文献