【作者】 吴松坪； 胡伦骥； 王春明； 胡席远；

【Author】 WU Song ping (Material Science and Technology College, Huazhong University of Science and Technology, Wuhan430074, China), HU Lunji, WANG Chun ming, HU Xi yuan.

【机构】 华中科技大学材料科学与工程学院；

【摘要】 熔透状态是衡量激光深熔焊焊缝成形质量的最重要和最根本的指标。根据焊缝的表面和截面形貌特征,可将熔透状态分为过熔透、完全熔透、不稳定熔透、以及未熔透。本研究应用自行研制的多通道信号传感系统,实时采集可听声、蓝紫光以及红外辐射等三路信号。设计了楔形板焊接和阶梯板焊接两组实验,并采用RMS平滑、STFT 分析和特征频段信号提取等手段分析信号。结果发现:可听声和蓝紫光信号RMS值和 2000～3500Hz频段信号幅值,在过熔透时极低,在完全熔透时很高,在未熔透时介于两者之间,三种熔透状态分界线明显;不稳定熔透时,三路信号波动较大,信号值比完全熔透时略低。据此规律可最终实现四种熔透状态的识别。更多还原

【Abstract】 The penetration status presents to be the most crucial and essential standard when evaluating the quality of deep penetra- tion welding. Four distinct penetration statuses - excessive penetration, full penetration, unstable penetration, and partial penetration - have been defined, according to characteristics of the welds. In this study, the self-made real-time monitoring system with multiple sensors, is applied to acquire audible sound, ultravilot and infrared emission signals in laser welding process. Cuneal plates and scalariform plates are designed for experiments; RMS, STFT and characteristic frequency-band analysis are used to process signals. It has been found that: the RMS value and the intensity of characteristic frequency band of both audible sound and ultravilot emission are extremely low in the case of excessive penetration; they are much higher when full penetration occurs; for partial penetration, they are distin-guishably between the former two statuses. Unstable penetration is noted for its surging signals, lower than those of full penetration status. According to these, four distinct penetration statues can be classified obviously.更多还原