超薄板脉冲微束等离子弧焊熔池振荡频率特征

Characteristics of Molten Pool Oscillation Frequency in Ultra-Thin Sheets by Pulsed Microplasma Arc Welding

脉冲微束等离子弧焊熔池振荡特征频率与焊件成形质量具有重要联系。传统的检测方法用于超薄板P-MPAW焊接熔池振荡频率实时检测时存在较大误差,因此课题组应用了一种基于激光反射的熔池振荡特征频率检测方法。课题组搭建的熔池振荡实时检测平台实现了超薄板P-MPAW熔池振荡特征信息的采集,并成功提取出熔池振荡特征频率,探讨了脉冲参数对于熔池振荡的影响机制。结果表明:熔池振荡频率随脉冲频率增大呈对数增长,随基值电流和峰值电流差异减小而减小,使用对数增长模型可对熔池振荡特征频率进行合理预测。

The molten pool oscillation frequency by pulsed microplasma arc welding has an important relationship with the quality of weldments.A new method based on laser reflection was applied by the research group,due to the large deviation of traditional method in real-time detection of molten pool oscillation frequency of ultra-thin sheets by PMPAW.The real-time detecting platform of molten pool oscillation was built to collect the characteristic information of molten pool oscillation of ultra-thin sheets by P-MPAW and the characteristic frequency of molten pool oscillation was extracted successfully.Furthermore,the influence mechanism of pulse parameters on the molten pool oscillation was discussed.The results show that the oscillation frequency of molten pool increases logarithmically with the increase of pulse frequency,and decreases with the decrease of the difference between base current and peak current.Logarithmic growth model can be used to predict the characteristic frequency of molten pool oscillation.