基于1Cr11Ni20Ti2B钢卡箍断裂原因分析及改进

陈体磊; 张迪; 张志强; 吴笑笑; 邢敬伟

doi:10.7512/j.issn.1001-2303.2021.04.20

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基于1Cr11Ni20Ti2B钢卡箍断裂原因分析及改进
Cause analysis and improvement of fracture of clamp based on 1Cr11Ni20Ti2B steel
2021年51卷第4期页码：101-104
纸质出版：2021
DOI： 10.7512/j.issn.1001-2303.2021.04.20
稿件说明：

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陈体磊, 张迪, 张志强, 等. 基于1Cr11Ni20Ti2B钢卡箍断裂原因分析及改进[J]. 电焊机, 2021,51(4):101-104. DOI： 10.7512/j.issn.1001-2303.2021.04.20.

CHEN Tilei, ZHANG Di, ZHANG Zhiqiang, et al. Cause analysis and improvement of fracture of clamp based on 1Cr11Ni20Ti2B steel[J]. Eletric Welding Machine2021, 51(4): 101-104. DOI： 10.7512/j.issn.1001-2303.2021.04.20.

摘要

卡箍在飞机上应用广泛

常用于各种气瓶的固定

其质量关系着飞行安全。飞机冷气瓶固定卡箍经常发生箍体断裂问题。用点焊方式焊接断裂位置处

通过体视观察、断口金相观察、断面成分分析、低倍试验、拉伸试验分析发现

卡箍断裂属于腐蚀疲劳断裂

疲劳源在卡箍表面焊点与热影响区交界处;金相检查发现卡箍焊点与热影响区的交界处存在细小裂纹。分析了卡箍断裂原因

并提出了预防措施。

Abstract

Clamps are widely used in airplanes and are often used to fix various gas cylinders. The quality of the clamp affects the safety of flight. The fixing clamps for air-conditioning cylinders in a certain type of aircraft often suffer from fracture of the clamp body. Spot welding is used to weld the fractured location.Through stereo observation

fracture met-allographic observation

section composition analysis

low power test

and tensile test analysis

it is found that the clamp fracture is a corrosion fatigue fracture;the source of fatigue is at the junction of the clamp welding point and the heat-affected zone.When analyzing the welding quality

the metallographic insp-ection finds that there are small cracks at the junction of the clamp welding point and the heat-affected zone. The phenom-enon and causes of clamp fracture are studied and preventive measures are proposed.