Analysis of dynamic stress-strain characteristics of AH36 steel welded joint

LIU Wei; ZHU Yongmei; SUN Ao

doi:10.12073/j.hjxb.20230712001

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2024 > 45(7): 50-58. > DOI: 10.12073/j.hjxb.20230712001

LIU Wei, ZHU Yongmei, SUN Ao. Analysis of dynamic stress-strain characteristics of AH36 steel welded joint[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2024, 45(7): 50-58. DOI: 10.12073/j.hjxb.20230712001

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Analysis of dynamic stress-strain characteristics of AH36 steel welded joint

School of Mechanical Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212008, China

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Received Date: July 11, 2023
Available Online: May 23, 2024

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Abstract

Abstract

Based on the thermal elastic-plastic method, the dynamic stress-strain deformation process of AH36 steel welded joint with 160° butt joint was studied. At the same time, the sample was made, and the dynamic change of welding strain was recorded by three-dimensional full-field strain measurement and analysis system, which verified the accuracy of welding finite element results. The effects of preheating temperature and welding velocity on dynamic stress and strain were analyzed. The results show that with the increase of preheating temperature, the welding deformation decreases gradually. When the preheating temperature is 200 ℃, the average welding deformation is reduced by 34.6% compared with the average welding deformation without preheating. At the same time, the distribution of welding stress field is improved, and the compressive stress distribution area of weld and heat affected zone is increased, but the stress amplitude is not sensitive to the change of preheating temperature. The welding deformation increases with the increase of welding velocity. When the welding velocity is greater than 5 mm/s, the growth trend gradually slows down, and the equipotential distribution area of the welding deformation field decreases. With the increase of welding velocity, the distribution area of welding compressive stress field decreases, and the distribution area of welding tensile stress field increases. The change of welding velocity will also cause the stress of middle layer thickness to fluctuate.
- welding joint,
- dynamic stress and distortion,
- numerical simulation,
- preheating temperature,
- welding velocity

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References (20)

References

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Analysis of dynamic stress-strain characteristics of AH36 steel welded joint