SUS304奥氏体不锈钢板点焊接头的超声成像分析
发布时间：2019-03-08 20:25
【摘要】：利用超声波水浸聚焦入射法对1 mm厚的SUS304奥氏体不锈钢板点焊接头进行超声C扫描成像检测.分析了不同焊接工艺参数下的C扫描图像特征,甄别了飞溅、焊穿等典型焊接缺陷,并提取其对应的A扫描信号.基于C扫描图像对焊核直径进行了测量,并与焊核切口端面尺寸进行了比较.结果表明,基于超声波水浸聚焦入射法得到的C扫描图像,能有效观测焊核内部形貌特征.焊接电流超过8 k A,电极力小于2 700 N时,超声波C扫描图像中清晰反映出飞溅、焊穿等缺陷,其对应区域的A扫描信号与正常熔核区波形特征有明显差异;借助超声C扫描图像测得的焊核直径为4.39~5.25 mm.
[Abstract]:Ultrasonic C-scan imaging of 1 mm thick SUS304 austenitic stainless steel plate spot welded joint was performed by ultrasonic immersion focusing incident method. The characteristics of C-scan images under different welding parameters were analyzed, and the typical welding defects such as spatter and penetration were screened out, and the corresponding A-scan signals were extracted. The diameter of the welding core is measured based on C-scan image and compared with the size of the cut face of the welding core. The results show that the C-scan image based on the ultrasonic immersion focused incident method can effectively observe the internal morphology of the welding nucleus. When the welding current is more than 8 Ka and the electric strength is less than 2 700 N, the ultrasonic C scan image clearly reflects the defects such as spatter and weld penetration, and the A scan signal of the corresponding area is obviously different from that of the normal fusion zone. The diameter of the welding core measured by ultrasonic C-scan image is 4.39 to 5.25 mm..
【作者单位】： 昆明理工大学机电工程学院创新制造技术研究所;
【基金】：国家自然科学基金资助项目(51565022,51565023)
【分类号】：TG441.7
本文编号：2437181
[Abstract]:Ultrasonic C-scan imaging of 1 mm thick SUS304 austenitic stainless steel plate spot welded joint was performed by ultrasonic immersion focusing incident method. The characteristics of C-scan images under different welding parameters were analyzed, and the typical welding defects such as spatter and penetration were screened out, and the corresponding A-scan signals were extracted. The diameter of the welding core is measured based on C-scan image and compared with the size of the cut face of the welding core. The results show that the C-scan image based on the ultrasonic immersion focused incident method can effectively observe the internal morphology of the welding nucleus. When the welding current is more than 8 Ka and the electric strength is less than 2 700 N, the ultrasonic C scan image clearly reflects the defects such as spatter and weld penetration, and the A scan signal of the corresponding area is obviously different from that of the normal fusion zone. The diameter of the welding core measured by ultrasonic C-scan image is 4.39 to 5.25 mm..
【作者单位】： 昆明理工大学机电工程学院创新制造技术研究所;
【基金】：国家自然科学基金资助项目(51565022,51565023)
【分类号】：TG441.7
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