CAJ | 학술논문

采用实验方法分析了汽车排气管氧传感器螺母焊接变形的成因及对策。通过红外热像仪获得螺母焊缝最高温度，计算对应于该最高温度的螺母最大变形量；用量具测量获得螺母焊接后的实际最大变形量。比较由红外热像仪和量具获得的螺母最大变形量后发现，两者数值相同，且焊后螺母直径缩小、壁厚增大，越接近焊缝处其直径越小、壁厚越大。因此焊缝高温是导致螺母焊后变形的重要因素，建议降低螺纹精度以弥补焊接热变形。
채용실험방법분석료기차배기관양전감기라모한접변형적성인급대책。통과홍외열상의획득라모한봉최고온도，계산대응우해최고온도적라모최대변형량；용량구측량획득라모한접후적실제최대변형량。비교유홍외열상의화량구획득적라모최대변형량후발현，량자수치상동，차한후라모직경축소、벽후증대，월접근한봉처기직경월소、벽후월대。인차한봉고온시도치라모한후변형적중요인소，건의강저라문정도이미보한접열변형。
Test method is adopted to analyze the reasons for and solutions to deformation of screw nut of oxygen sensor of the automobile exhaust pipe when being welded.The highest temperature at weld-gap of screw nut is obtained by using infrared cameras.The maximum deformation corresponding to the highest temperature is calculated,the actual maximum deformation of screw nut after welding corresponding to the highest temperature is calculated using a measuring tool.The comparison between the maximum deformation of screw nut obtained by using infrared thermography and that by a measuring tool shows that the two values are the same,the diameter of screw nut decreases,and the wall is thicker.And the closer to weld-gap,the shorter is the diameter and the thicker is the wall.Therefore,high temperature of weld-gap contributes to the screw deformation after being welded.This paper thus suggests that accuracy of screw thread be reduced so as to remedy heat deformation of welding.