ASTM A572 Gr65钢焊接接头疲劳断裂表征与评定

杨泽源; 闫志峰; 王树邦; 韩明珠; 张红霞

doi:10.7512/j.issn.1001-2303.2022.12.04

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ASTM A572 Gr65钢焊接接头疲劳断裂表征与评定
Characterization and Evaluation of Fatigue Fracture of Welded Joints of ASTM A572 Gr65 Steel
2022年52卷第12期页码：36-42
收稿：2022-02-12，

纸质出版：2022-12-20
DOI： 10.7512/j.issn.1001-2303.2022.12.04
稿件说明：

移动端阅览

杨泽源，闫志峰，王树邦，等.ASTM A572 Gr65钢焊接接头疲劳断裂表征与评定［J］.电焊机，2022，52（12）：36-42. DOI： 10.7512/j.issn.1001-2303.2022.12.04.

YANG Zeyuan, YAN Zhifeng, WANG Shubang, et al.Characterization and Evaluation of Fatigue Fracture of Welded Joints of ASTM A572 Gr65 Steel[J].Electric Welding Machine, 2022, 52(12): 36-42. DOI： 10.7512/j.issn.1001-2303.2022.12.04.

摘要

ASTM A572 Gr65钢焊接结构件经常要承受动态载荷的作用，接头部位容易发生疲劳失效。在分析ASTM A572 Gr65钢MAG焊接接头力学性能的基础上，结合红外热像法评定了其焊接接头的疲劳性能。结果表明，焊缝区金相组织主要为针状铁素体，其硬度为197~203 HV0.5；焊接接头的屈服强度为350 MPa；在静态载荷和循环载荷下，ASTM A572 Gr65钢焊接接头的表面温度均呈规律性变化，循环载荷下的变形规律与疲劳过程中的温度演化相对应。利用疲劳过程中试件表面的红外温度信息进行评定，疲劳极限为234.18 MPa，与疲劳试验

S-N

曲线得到的结果（246.60 MPa）相比误差为5.04%；疲劳断裂发生于焊缝区，疲劳裂纹源位于试样内部，呈“鱼眼”状。

Abstract

ASTM A572 Gr65 steel welded structure is often subjected to dynamic loads

and the joints are prone to fatigue failure. Based on the analysis of the mechanical properties of MAG welded joint of ASTM A572 Gr65 steel

the fatigue properties of the welded joint were evaluated by infrared thermography. The results show that the metallographic structure of the weld zone is mainly acicular ferrite

and its hardness is 197~203 HV0.5；the yield strength of welded joints is 350 MPa; the surface temperature of welded joints of ASTM A572 Gr65 steel changes regularly under static load and cyclic load. The deformation law under cyclic load corresponds to the temperature evolution during fatigue. The infrared temperature information on the surface of the specimen during fatigue is evaluated. The fatigue limit is 234.18 MPa

and the error is 5.04% compared with the result of 246.6 MPa obtained from the

S-N

curve of fatigue test; the fatigue fracture occurs in the weld zone

and the fatigue crack source is located in the interior of the sample

in the shape of "fish eye".

关键词

Keywords

references

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