Distortion and residual stress generated by laser beam welding of high strength steel

被引：0

作者：

Kim Y.-C. ^{[1
]}

Hirohata M. ^{[1
]}

Hageyama Y. ^{[2
]}

Inose K.

机构：

[1] Joining and Welding Research Institute, Osaka University

[2] Graduate School, of Engineering, Osaka University

来源：

Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society | 2010年 / 28卷 / 03期

关键词：

High strength steel; Laser beam welding; Phase transformation; Residual stress; Welding distortion;

D O I：

10.2207/qjjws.28.281

中图分类号：

学科分类号：

摘要：

In order to elucidate distortion and residual stress generated by welding of high strength steel (HT780) by laser beam, a series of experiments and analyses were carried out. The angular distortion, generated by bead-on-plate welding was V-shape and its magnitude was about 2mm. The longitudinal bending distortion was extremely small. On the surface of plate, the residual stress component in welding direction was tensile and it was smaller than yield stress in the weld metal. The residual stress was almost zero outside the weld metal. The phase transformation range in cooling stage and the temperature dependency of mechanical properties were obtained. The mechanical properties in the phase transformation range in cooling stage could not be specified due to transformation expansion. Therefore, they were idealized by considering transformation expansion and transformation superplasticity. The validity of the idealized mechanical, properties was verified by simulating the experiment by the thermal elastic-plastic analysis. It was elucidated that the welding out-of-plane distortion and tensile residual stress were largely controlled by phase transformation in cooling stage although the bead width of laser beam welding was extremely narrow.

引用

页码：281 / 287

页数：6

共 7 条

[1]

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[2]

Hirohata M., Yanamoto K., Inose K., Kim Y.-C., Propagation of fatigue crack in laser beam welded joints of high strength steel, Preprints of the National Meeting of JWS, 85, pp. 162-163, (2009)

[3]

Inose K., Lee J.-Y., Nakanishi Y., Kim Y.-C., Characteristics of welding distortion/residual stress generated by fillet welding with laser beam and verification of generality of its high accurate prediction, Quarterly Journal of the Japan Welding Society, 26, 1, pp. 61-66, (2008)

[4]

Ueda Y., Kim Y.-C., Chen C., Tang Y.-M., Mathematical treatment of phase transformation and analytical calculation method of restraint stress-strain, Quarterly Journal of the Japan Welding Society, 2, 1, pp. 89-97, (1984)

[5]

Kim Y.-C., Lee J.-Y., Sawada M., Inose K., Verification of validity and generality of dominant factors in high accurate prediction of welding distortion, Quarterly Journal of the Japan Welding Society, 25, 3, pp. 450-454, (2007)

[6]

Kim Y.-C., Lee J.-Y., Inose K., High accurate prediction of welding distortion generated by fillet welding, Quarterly Journal of the Japan Welding Society, 23, 3, pp. 431-435, (2005)

[7]

Kim Y.-C., Hirohata M., Hageyama Y., Modeling of phase transformation in cooling process and verification of its validity, Conference on High Strength Steel for Hydropower Plants, pp. 151-154, (2009)

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