激光深熔焊焊缝的熔透性监测研究

Research on Weld Penetration Monitoring by Laser Plasma Optical Signal in Laser Welding

随着激光焊接在国防工业中的应用越来越广泛,焊接质量的监测和控制逐步成为一项重要的研究内容,而 焊缝的熔透性控制是其中最重要的参数之一,特别对于一些密封件而言。通过对伴随激光深熔焊接所存在的光致 等离子体的蓝紫光信号相对强度的监测,以判断焊缝的熔透性。利用信号监测系统,在焊接时采集光致等离子体 蓝紫光的强度作为原始分析信号,通过对数据的分析和处理,以及大量的实验结果与数据分析结果的对比,寻求信 号与焊缝熔透性的关系。研究结果表明,焊缝的熔透性与光致等离子体光信号的累积强度有对应关系,当焊缝全 部熔透时,光信号稳定性非常好,而一旦焊缝处于未熔透或熔透性差时,光信号会产生极大的波动。

Laser induced plasma is an important physical phenomena companied with laser keyhole welding. In this paper, the relation between weld penetration and optical signal was studied. Through many experiments, variety of optical signals were obtain when weld penetration was different. The results showed that the optical signals had better stability in full-penetration, and in partial-or non-penetration, optical signals had higher fluctuations. The aim of this study was to find a method to monitor and control weld penetration in laser welding.