1台WIIY-50×3000卷板机,使用1年后上主轴产生裂痕,用超声波探伤检查,轴为对接,组织致密程度差别达3个等级。超声波探伤分析一半为锻造件,一半为铸造件,达不到国标探伤Ⅱ级要求。将轴切开后,验证了探伤结果,材料成分为45号钢。分析断裂原因,有焊接夹渣、焊接面积少、焊接工艺不正确、强度低等缺陷。 A Taiwan WIIY-50 × 3000 bending machine, the use of a crack on the spindle after 1 year, with ultrasonic testing to check the shaft docking, the degree of organization of the difference between the three levels. Ultrasonic testing half of the forging parts, half of the casting, up to the national standard flaw detection level Ⅱ requirements. After the shaft was cut open, the test results were verified. The material composition was 45 steel. Analysis of fracture causes, welding slag, welding area less, welding process is not correct, low strength and other defects.