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一、前言 电阻点焊工艺在航空发动机和飞机制造中的应用颇为广泛,但常产生脱焊。国内各工厂系采用破坏检查工艺试片的方法来估计零件上的焊核直径,因此不能发现焊件上的脱焊点,致使某些产品不得不定期解剖,耗费掉大量资金。国外近十几年来,发展了检测输入焊点的能量、动态电阻、热膨胀和超声波监控技术,其中检测能量的方法已用于生产。 我们考虑到提高航空产品点焊质量的迫切要求和实际条件的可能性,选择了用能量积分监视焊核直径的方法解决脱焊的检验问题。我们采用与沈阳电子所共同研制的SD-1型点焊质量监控仪,进行了大量的工艺研究。这种技术的特点是,在点焊过程中实时监视,监视结果打印输出,并有报警系统。它适用于在交、直流点焊机上,在铝合金、结构钢、不锈钢和高温合金点焊过程中监视焊核直径。使用方便可靠。 二、监视焊核直径的原理 在点焊过程中,影响焊核直径大小的因素很多,主要有焊接电流、通电时间、电极压力、
I. INTRODUCTION Resistance spot welding technology is widely used in the manufacture of aeroengines and aircraft, but it often causes desoldering. Domestic factories use the method of destructive inspection of test strips to estimate the weld core diameter on the part. Therefore, the desoldering points on the weldment can not be found, resulting in some products having to be regularly dissected and consuming a large amount of funds. Nearly 10 years abroad, the development of testing input welding energy, dynamic resistance, thermal expansion and ultrasonic monitoring technology, including the method of detecting energy has been used in the production. We consider the possibility of improving the spot welding quality of aviation products and the actual conditions. We selected the method of monitoring the weld core diameter with energy integral to solve the problem of test of desoldering. We use the SD-1 spot welding quality monitor jointly developed by Shenyang Electron Co., Ltd. and carry out a large amount of process research. This technology is characterized by real-time monitoring during spot welding, monitoring results printed out, and alarm systems. It is suitable for spot welding of aluminum alloy, structural steel, stainless steel and superalloy on the AC / DC spot welder. Easy to use and reliable. Second, the principle of monitoring the weld core diameter In the spot welding process, the size of the weld core diameter of many factors, the main welding current, power time, electrode pressure,