Abstract Vibration welding technique has been widely used to weld molded surfaces parts produced by injection or compression molding techniques. However, the majority of early studies used machined surfaces to eliminate the complication associated with molded surfaces. Different process parameters such as the welding pressure, frequency, and amplitude have been investigated to determine their optimal values that maximize the welding strength. However, some other parameters such as joint design and the welding interface preparation were leftover for real application test or for technology transfer studies. Most of molded parts from semi-crystalline materials and their composites usually have skin layer that was exposed to thermal history differs from that of the core. Moreover, the amount and the orientation of fibers in the skin layer differ from that of core and shell regions. Therefore, this work investigates and explores the effect of the molded surfaces with skin on tensile strength of vibration welded butt joints made from polybutylene terephthalate reinforced with 30% glass fiber (PBT GF30). The effect of fibers orientation on the welded joint strength has been also investigated.

中文翻译：

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表面处理对PBT复合材料振动焊接对接接头强度的影响

摘要 振动焊接技术已广泛用于焊接通过注射或压缩成型技术生产的成型表面零件。然而，大多数早期研究使用机加工表面来消除与模制表面相关的并发症。已经研究了不同的工艺参数，例如焊接压力、频率和振幅，以确定它们的最佳值，以最大限度地提高焊接强度。然而，一些其他参数，如接头设计和焊接界面准备，被遗留下来用于实际应用测试或技术转移研究。大多数由半结晶材料及其复合材料制成的模制部件通常具有暴露于热历史的表层，这与芯的表层不同。而且，表层中纤维的数量和取向与核和壳区的纤维数量和取向不同。因此，这项工作调查并探讨了带蒙皮的模制表面对由 30% 玻璃纤维增​​强的聚对苯二甲酸丁二醇酯 (PBT GF30) 制成的振动焊接对接接头拉伸强度的影响。还研究了纤维取向对焊接接头强度的影响。