Inline Repair of Blowouts During Laser Welding

Physics Procedia Pub Date : 2017-01-01 DOI:10.1016/j.phpro.2017.08.022

K.S. Hansen , F.O. Olsen , M. Kristiansen , O. Madsen

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引用次数: 2

Abstract

In a current laser welding production process of components of stainless steel, a butt joint configuration may lead to failures in the form of blowouts, causing an unacceptable welding quality. A study to improve the laser welding process was performed with the aim of solving the problem by designing a suitable pattern of multiple small laser spots rather than a single spot in the process zone.

The blowouts in the process are provoked by introducing small amounts of zinc powder in the butt joint. When the laser heats up the zinc, this rapidly evaporates and expands, leaving the melt pool to be blown away locally. Multiple spot pattern designs are tested. Spot patterns are produced by applying diffractive optics to a beam from a single mode fiber laser.

Results from welding while applying spot patterns both with and without trailing spots are presented. Data showing the power ratio between a trailing spot and two main spots as a function of spot distance is also presented.

The results of the study show that applying multiple spots in the welding process may improve the process stability when welding materials with small impurities in the form of zinc particles.

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激光焊接时爆孔的在线修复

在目前不锈钢构件的激光焊接生产过程中，对接接头的配置可能会导致爆裂形式的失效，从而导致不可接受的焊接质量。为了改善激光焊接工艺，在加工区域设计合适的多个小激光光斑而不是单个光斑，进行了一项研究。在对接接头中加入少量锌粉会引起井喷。当激光加热锌时，锌迅速蒸发和膨胀，留下熔池被局部吹走。测试了多个点图案设计。光斑图案是通过对单模光纤激光器的光束施加衍射光学而产生的。给出了采用带尾点和不带尾点的点焊图案进行焊接的结果。数据显示了尾随光斑和两个主光斑之间的功率比作为光斑距离的函数。研究结果表明，在焊接过程中采用多点焊可以提高锌颗粒形式杂质较少的材料的焊接稳定性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Physics Procedia

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