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Welding techniques for reinforced thermoplastic composites

机译：增强热塑性复合材料的焊接技术

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摘要

The use of thermoplastic composites has been steadily increasing recently due to development of new materials, fabrication processes and the potential for recycling (fuelled by the increasing environmental awareness). The possibility of welding thermoplastic composites allows complex geometries to be joined at lower cost and still be mechanically reliable. Two common techniques are resistive implant welding and induction welding. Both of these methods involve the inclusion of a metallic insert at the joint and the application of an external electromagnetic and electric field respectively. Some plastics, such as polypropylene (PP) are difficult to adhesively bond, which means that for many applications only mechanical fastening can be used. However, due to the many disadvantages of mechanical fastening - in particular with composites - welding is a very attractive option. The results obtained have been very promising, showing not only high joint strengths, but also that processing is much simpler and quicker than mechanical fastening (which is labour intensive) or adhesive bonding (which is time consuming). In addition, consistent results were achieved for long welds of up to 1500 mm in length, which demonstrates that this technique is able to meet real-life applications.
机译：由于新材料的开发，制造工艺以及回收的潜力，热塑性复合材料的使用近来一直在稳步增长（环保意识的增强推动了这一趋势）。焊接热塑性复合材料的可能性允许以较低的成本连接复杂的几何形状，并且仍具有机械可靠性。两种常见的技术是电阻植入焊接和感应焊接。这两种方法都涉及在接头处包括金属插件以及分别施加外部电磁场和电场。某些塑料，例如聚丙烯（PP）很难粘接，这意味着对于许多应用而言，只能使用机械紧固。然而，由于机械紧固的许多缺点，特别是对于复合材料，机械焊接是非常有吸引力的选择。获得的结果非常令人鼓舞，不仅显示出较高的接合强度，而且加工比机械紧固（这是劳动密集型的）或粘合剂粘结（这是耗时的）要简单得多，而且速度也快得多。此外，对于长度不超过1500 mm的长焊缝，获得了一致的结果，这表明该技术能够满足实际应用。

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