【作者】 王春明； 胡伦骥； 胡席远； 杜汉斌；

【Author】 Wang Chunming (Materials science and technology department, Huazhong university of science and technology, Wuhan, 430074, China) Hu Lunji, Hu Xiyuan, Du Hanbin

【机构】 华中科技大学材料学院；

【摘要】 本文通过实验的方法探讨了钛合金激光焊接过程中的等离子体光信号与焊接质量的关系,结果分析表明,钛合金的激光焊接过程比低碳钢产生更强烈的等离子体云, 等离子体光信号可以较好的反映焊接过程的稳定性和焊接质量的变化。焊接质量良好时, 等离子体光信号幅值在某一固定值上下波动,当改变焊接参数使焊接熔深或熔宽改变时, 信号的平均幅值亦有明显改变:当较大间隙或错边存在时,等离子体光信号的平均值明显降低,但两种信号的特征不尽相同,前者造成等离子体光信号剧烈动荡而均值很低, 而后者一定范围内,随着错边量增加,信号幅值逐渐减小。上述数据和进一步的试验表明,可以用等离子体光信号的幅值高低和波动大小作为焊接质量实时监测和控制的特征信号。更多还原

【Abstract】 In this paper, it is discussed by experimental method that the relationship of Titanium alloy laser welding quality and the plasma optic signal. It is discovered that the plasma plume during Titanium alloy laser welding is stronger than mild steel laser welding, and the plasma optic signal can reflect the stability of laser welding process and the change of weld quality. The optic signal’s amplitude has a little fluctuation around a steady level when the good weld achieved, and changes obviously when the width or penetration of weld altered under the different welding conditions. If a gap or mismatch existed before welding, the signal’s averaged amplitude decreases greatly, but the two kinds of signal’s characteristics are different. The gap resulted in that the signal fluctuated strongly and its averaged amplitude was very low, and as mismatch increased in a little range, the amplitude became lower and lower. The aforementioned data and farther experiments indicate: the plasma optic signal’s amplitude and fluctuation can be used as characteristic signal for real-time monitoring and control for Titanium laser welding.更多还原