应力筛选试验对某雷达模块壳体的影响性分析

Analysis of the Influence of Stress Screening Test on a Certain Radar Module Shell

某雷达模块液冷壳体的焊接缺陷往往会引起应力筛选后出现一定比例的漏液现象。而装配后的应力筛选过程中的不合理因素会对焊接缺陷造成进一步地放大。本文分别分析了应力筛选试验的温度循环过程和随机振动过程对模块壳体的影响。结果发现排液后温度循环过程封闭腔压力变化对焊缝影响较小;随机振动过程激励在工装的不同部位均有一定倍数的响应放大并形成激励传递链,对焊缝产生了非设计必要的影响。基于试验及分析结果,为避免液冷焊接类壳体的过筛选提出了适应性建议,具体措施为在温度循环过程前模块应进行充分排液且对振动工装进行振动响应实测。

A certain rate of liquid leakage after stress screening can att ribute to the welding defects of the liquid cooled shell of the radar module.Some unreasonab le factors during the stress screening may further amplified the welding defects.In this study,during the stress screening,the effects of the temperature cycling and random vibration on the module shell were analyzed.The results show that the pressure change in the closed chamber during the temperature cycling after liquid discharging has little effect on the weld seam.Furthermore,the random vibration process excitation amplifies the response at different parts of the fixture and forms an excitation transmission chain,which has a non-design necessary impact on the weld seam.Based on the results of the study,It is suggested that the module should be fully drained before the temperature cycling,and the vibration response of the vibration fixture should be measured to avoid o verscreening.