Identifying the influence of transient thermal tensioning treatments on minimizing distortion and improving fatigue behavior of steel welded

Authors

DOI:

https://doi.org/10.15587/1729-4061.2023.285192

Keywords:

TTT treatment, distortion, fatigue behavior, flame heating, welding efficiency, welding process, steel welded, thin plates, microstructure, tensile strength

Abstract

Due to the cost efficiency of welding repairs, the use of transient thermal tensioning (TTT) has begun to be applied to minimize distortion and residual stresses, particularly on thin plates. However, it requires a long preheating time especially on large structures, so that the efficiency of welding process cannot be maximized. Application of TTT treatment using flame heater on TTT treatment which require no preheating time so that welding efficiency can be increased. The aims of this study are to investigate the TTT treatment in reducing distortion, investigate the effect of TTT treatment on tensile strength and hardness, investigate the microstructure and its effect on tensile strength and hardness, investigated the effect of TTT treatment on fatigue crack growth rate. In this research, TTT treatment was performed by flame heating on the both side of weld line integrated in welding process. Temperature in both side plates were controlled and measured using thermocouple. The tests on the weld joints were carried out including distortion measurement, microstructure examination, hardness measurement, tensile test and fatigue test. Results showed that the TTT (60) treatment is the most effective in decreasing the longitudinal distortion which placing the flame heating a 60 mm behind welding torch. It tends to increase the tensile strength of weld metal supported by its increasing hardness. The increase in the percentage of the acicular ferrite phase is linearly related to the tensile strength and hardness of the weld joint. The fatigue behavior could be improved by TTT treatment (60) which is associated with the effect of decreasing residual stress in the weld metal region. This treatment is the best parameter in an effort to increase the welding efficiency of the TTT method

Author Biographies

Heri Wibowo, Yogyakarta State University

Doctor of Mechanical Engineering, Associate Professor

Department of Mechanical Engineering Education

 

Fredy Surahmanto, Yogyakarta State University

Doctor of Mechanical Engineering, Assistant Professor

Department of Mechanical Engineering Education

 

Mochammad Noer Ilman, Universitas Gadjah Mada

Doctor of Mechanical Engineering, Full Professor

Department of Mechanical and Industrial Engineering

 

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Identifying the influence of transient thermal tensioning treatments on minimizing distortion and improving fatigue behavior of steel welded

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Published

2023-08-31

How to Cite

Wibowo, H., Surahmanto, F., & Ilman, M. N. (2023). Identifying the influence of transient thermal tensioning treatments on minimizing distortion and improving fatigue behavior of steel welded. Eastern-European Journal of Enterprise Technologies, 4(12 (124), 37–46. https://doi.org/10.15587/1729-4061.2023.285192

Issue

Vol. 4 No. 12 (124) (2023): Materials Science

Section

Materials Science

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Copyright (c) 2023 Heri Wibowo, Fredy Surahmanto, Mochammad Noer Ilman

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