激光热丝焊电阻热控制及送丝参数优化

发布时间：2018-01-17 01:21

本文关键词：激光热丝焊电阻热控制及送丝参数优化　出处：《焊接学报》2015年09期 　论文类型：期刊论文

【摘要】：如何选择送丝参数从而获得合适电阻热是确保焊丝稳定过渡和高效熔覆的必要条件.文中通过高速摄像观察电阻热对焊丝过渡行为的影响,采用红外双色测温对焊丝温度进行测量.结果表明,导电嘴以下30 mm处焊丝的温度可作为最优电阻热的判据;利用数值模拟方法建立了焊丝非稳态导热模型,计算了导电嘴以下30 mm处焊丝的温度,从而可以预测最优电阻热对应的送丝参数.对不同送丝速度下最优电流比较发现,一定电阻热下加热电流的平方与送丝速度的比值为常数,可用于快速选择最优电阻热的送丝参数.
[Abstract]:How to select the wire feeding parameters to obtain the appropriate resistance heat is a necessary condition to ensure the stable transition and high efficiency cladding of the welding wire. The influence of the resistance heat on the wire transition behavior is observed by high speed camera in this paper. The temperature of welding wire is measured by infrared two-color temperature measurement. The results show that the temperature of wire below 30 mm of conductive nozzle can be used as the criterion of optimum resistance heat. The unsteady heat conduction model of welding wire is established by numerical simulation, and the temperature of welding wire is calculated at 30 mm below the conductive nozzle. It is found that the ratio of the square of heating current to the feeding speed is constant for the comparison of the optimal current at different feeding speeds. Can be used to quickly select the optimal resistance heat feeding parameters.
【作者单位】：清华大学机械工程系;清华大学先进成形制造教育部重点实验室;
【基金】：国家自然科学基金资助项目(51005125) 国家重点基础研究发展计划资助项目(2011CB013404)
【分类号】：TG456.7
【正文快照】： 0序言激光热丝焊利用电阻热将焊丝预加热后送入熔池,减小了焊丝熔化对激光热量的依赖,不仅降低了焊丝与激光相对位置的精度要求,而且提升了填充效率,是一种有发展前景的激光填丝焊技术,目前已在表面堆焊[1-3]和窄间隙焊接[4]中得到应用.例如日本的日立-巴布科克公司利用激光热

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