New developed welding electrode for improving the fatigue strength of welded joints

被引：0

作者：

Wang, Wenxian ^{[1
]}

Huo, Lixing ^{[1
]}

Zhang, Yufeng ^{[1
]}

Wang, Dongpo ^{[1
]}

Jing, Hongyang ^{[1
]}

机构：

[1] Coll. of Mat. Sci. and Eng., Tianjin Univ., Tianjin 300072, China

来源：

Journal of Materials Science and Technology | 2002年 / 18卷 / 06期

关键词：

Fatigue of materials - Joints (structural components) - Metallographic microstructure - Phase transitions - Residual stresses - Strength of materials;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

A new welding electrode, low transformation temperature electrode (LTTE), was introduced. Its design principle, mechanics, the chemical compositions of its deposited metal and manufacturing methods were described. It was proved that the best transformation starting temperature from austenite to martensite of the deposited metal of LTTE was at about 191°C and it was obtained by adding alloying elements such as Cr, Ni, Mn and Mo. The microstructure of the weld metal of the LTTE were low carbon martensite and residual austenite. The compressive residual stress was induced around the weld of the LTTE and the -145 MPa in compression could be obtained in the middle of the weld metal. The fatigue tests showed that the fatigue strength of the longitudinal welded joints welded with the LTTE at 2×106 cycles was improved by 59% compared with that of the same type of welded joints welded with conventional E5015 and the fatigue life was increased by 47 times at 162 MPa. It is very valuable method to improve the fatigue performance of welded joints. The chemical compositions of LTTE and E5015 are C-Si-Mn-S-P-Cr-Ni-Mo and C-Si-Mn-S-P-Cr-Ni, respectively.

引用

页码：527 / 531