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Weld read-through defects in laser transmission welding.

机译：激光透射焊接中的焊接通读缺陷。

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摘要

In laser Transmission Welding (LTW), the laser beam passes through the transparent part and is dissipated as heat in the absorbent material through the use of laser-absorbing pigments such as carbon black (CB). This energy is then conducted further into both parts. Melting and subsequent solidification occur at the interface causing a weld to form between the two parts.;A series of lap welds was made using a range of CB levels, laser powers and polypropylene part thicknesses. A profilometer was used to measure the size and shape of the defects generated on the surface of the black part. Two types of defects were observed: ribs and sink marks. It was observed that lower powers combined with higher carbon black levels generally resulted in smaller defects. The type of defect depended on the boundary conditions between the two parts and the flow of polymer that had thermally expanded during welding (flash). If weld flash flowed into gaps between the two plates, rib defects were always observed. If flash flowed elsewhere and no gaps existed between the plates, sink marks occurred. Finite element modeling was used to qualitatively validate these observations.;Gluing or welding structures to the back of automotive Class-A panels often results in the appearance of undesirable surface deformations on the Class-A side. Through control of the laser welding and material parameters, it may be possible to use contour LTW as a means of joining structures to the back of absorbent Class-A panels without creating these unwanted surface defects.
机译：在激光透射焊接（LTW）中，激光束穿过透明部分，并通过使用吸收激光的颜料（例如炭黑（CB））作为热量散发到吸收性材料中。然后，该能量被进一步传导到两个部分中。在界面处发生熔化和随后的凝固，从而导致两个零件之间形成焊接。使用一系列的CB水平，激光功率和聚丙烯零件厚度，进行了一系列搭接焊。轮廓仪用于测量在黑色部件表面上产生的缺陷的大小和形状。观察到两种类型的缺陷：肋骨和凹痕。观察到较低的功率与较高的炭黑含量相结合通常会导致较小的缺陷。缺陷的类型取决于两个部分之间的边界条件以及在焊接（飞边）过程中热膨胀的聚合物流。如果焊缝溢流流入两块板之间的缝隙中，则始终会观察到肋缺陷。如果溢料流到其他地方，并且两板之间没有缝隙，则会出现凹痕。使用有限元建模来定性地验证这些观察结果。将结构胶粘或焊接到汽车A类面板的背面通常会导致A类侧面出现不良的表面变形。通过控制激光焊接和材料参数，可以将轮廓线LTW用作将结构连接到A级吸水板背面的一种方式，而不会产生这些不良的表面缺陷。

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  • 作者

    Cao, Xiaochao.;

  • 作者单位

    Queen's University (Canada).;

  • 授予单位 Queen's University (Canada).;
  • 学科 Plastics Technology.
  • 学位 M.A.Sc.
  • 年度 2010
  • 页码 138 p.
  • 总页数 138
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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