**5.3 Welding displacement**

**Figure 13** showed the contour of z-direction welding displacement through TEP FEM and CMM measurement. The maximum z-direction welding displacement by TEP FEM was 0.9363 mm without considering back-gouging and 1.5874 with considering back-gouging, respectively. The maximum z-direction displacement by

**Figure 12.**

*Transverse welding residual stress distribution: (a) without considering back-gouging; (b) with considering back-gouging.*

#### **Figure 13.**

*Contour of z-direction welding displacement: (a) without considering back-gouging, (b) with considering back-gouging, and (c) experimental measurement.*

**Figure 11.**

**118**

*Longitudinal residual stress distributions along L1, L2, and L3.*

*New Challenges in Residual Stress Measurements and Evaluation*

Higher Education Institutions, Collegiate Natural Science Fund of Jiangsu Province (14KJA570001), and High-tech Ship Scientific Research of Ministry of Industry and

Information Technology of the People's Republic of China in 2017.

*Residual Stress Evaluation with Contour Method for Thick Butt Welded Joint*

*DOI: http://dx.doi.org/10.5772/intechopen.90409*

**Author details**

**121**

Qingya Zhang1,2, Hong Zhou1 and Jiangchao Wang<sup>2</sup>

\*Address all correspondence to: wangjiangchaocn@gmail.com

Science and Technology, Zhenjiang, China

Science and Technology, Wuhan, China

provided the original work is properly cited.

1 School of Naval Architecture and Ocean Engineering, Jiangsu University of

2 School of Naval Architecture and Ocean Engineering, Huazhong University of

© 2020 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium,

\*

**Figure 14.** *Comparison of z-direction welding displacement.*

CMM measurement was 0.80750. The quantitative analysis was carried out by extracting the mid-length displacement, as was displayed in **Figure 14**. Taking the weld center as the deformation base point, it can be seen that the computation of z-direction welding displacement considering back-gouging had a better agreement with the measurement. It is analyzed that the deformation after main welding was mitigated by the back-gouging process. Therefore, it can be concluded that the residual stress distribution and magnitude obtained by the efficient TEP FEM considering the back-gouging process were accurate and effective.
