作　　者： ; ; ; ;

机构地区： 华南理工大学机械与汽车工程学院

出　　处： 《华南理工大学学报（自然科学版）》 2008年第4期1-5,共5页

摘　　要： 针对焊接熔滴过渡频率高、难以观察的特点,以焊接电流、电弧电压、熔滴过渡图像为信息源,建立了高速摄像与电信号小波分析系统.文中介绍了该系统的构成,分析了系统构建中的关键技术,并利用该系统对自行研制的脉冲熔化极气体保护(MIG)焊电源熔滴过渡信号进行了测试与分析.结果表明,脉冲MIG焊短路过渡发生时,电弧电压信号、弧焊电流信号发生突变,有明显的特征变化,可直接用于过程控制;而射流过渡、射滴过渡发生时,电弧电压信号、弧焊电流信号变化平稳,没有明显的特征变化.这说明可通过提取熔滴图像特征信息对焊接熔滴过渡过程进行检测和质量控制. In the welding process, the droplet transfer is of high frequency and is difficult to observe. In order to solve these problems, this paper establishes a high-speed photography system combined with the wavelet analysis of electric signals, with the welding current, the arc voltage and the droplet transfer photography as information resources. The structure and the key techniques of the proposed system are then introduced. The proposed system is finally used to test and analyze the droplet transfer signals of a self-designed pulsed MIG welding power. Experimental results show that, when a short circuit transfer occurs, the characteristics of both the welding current wave and the arc voltage wave greatly change, which helps to control the welding process. However, when the spray flow and the spray droplet transfers occur, the welding current and the arc voltage waves are both smooth without obvious changes. Thus, the droplet transfer process can be tested and controlled by extracting the characteristic information of droplet transfer pictures.

关 键 词： 弧焊 熔滴过渡 高速摄像 电信号 小波分析

领　　域： [金属学及工艺]