燃烧室进油管焊缝裂纹失效分析

燃烧室进油管沿周圈出现开裂现象,对它进行外观检查、断口分析、冶金分析及综合分析,结果表明燃烧室进油管在氩弧焊焊接过程中由于焊接不当,导致在焊缝收弧处产生焊接缺陷——咬边及焊瘤,且焊缝处于尺寸变化较大的部位,容易产生应力集中,在工作过程中萌生裂纹并疲劳扩展。

Failure Analysis on Weld Crack of Firebox Vitta

The vitta of firebox crazes at the circumferential direction. Fracture surface observation, metallurgical inspection and comprehensive analysis on the vitta are carried out and the results show that the vitta is welded improperly which results in welding defects-undercut and overlap appear at receiving place of weld ,and weld is easy to appear stress concentration because it is the major dimensional changed region,so the cracks spring and spread under fatigue load finally.