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Abstract
Spot welding of dissimilar materials can utilize the respective advantage comprehensively, of which reliable prediction of fatigue life is the key issue in the structure design and service process. Taking into account almost all the complex factors that have effects on the fatigue behavior such as load level, thickness, welding nugget diameter, vibrational frequency, and material properties, this article proposed an energy dissipation-based method that is able to predict the fatigue life for spot-welded dissimilar materials rapidly. In order to obtain the temperature gradient, the temperature variations of four-group spot-welded joint of SUS301 L-DLT stainless steel and Q235 carbon steel during high-cycle fatigue tests were monitored by thermal infrared scanner. Specifically, temperature variation disciplines of specimen surface were divided into four stages: temperature increase, temperature decrease, continuous steady increase in temperature, and ultimate drop after the fracture. The material constant C that a spot-welded joint of dissimilar material needs to reach fracture is 0.05425°C·mm3. When the specimen was applied higher than the fatigue limit, the highest error between experimental values and predicted values is 18.90%, and others are lower than 10%. Therefore, a good agreement was achieved in fatigue life prediction between the new method and the validation test results.
Highlights
High speed, heavy load, energy saving, safety, and comfort are the main features of Chinese high-speed train technology, and the lightweight structure is an effective way to achieve the above goals
Based on the energy dissipation theory, a rapid fatigue life prediction method is proposed for spot-welded dissimilar materials of SUS301 L-DLT stainless steel and Q235 carbon steel
The following conclusions can be made: 1. Temperature variation of the four-group dissimilar material spot-welded joint of SUS301 LDLT stainless steel and Q235 carbon steel under various load levels was monitored via thermal IR scanner
Summary
Heavy load, energy saving, safety, and comfort are the main features of Chinese high-speed train technology, and the lightweight structure is an effective way to achieve the above goals. The SUS301 L-DLT austenitic stainless steel train is widely used by the advantages of light weight, well corrosion resistance, high tensile strength, and safe performance. Q235 low carbon steel possesses the fine weldability and hardening capacity. Most low carbon steel welded joints and heat-affected zone have higher hardness than the parent materials. Some frameworks of trains are manufactured by the connection method of dissimilar material spot-welded joint of SUS301 L-DLT stainless steel and Q235 carbon steel, on one hand, which has comprehensive utilization of the both advantages. It can overcome the joint strength reduction resulting from large welding deformation of School of Materials Science and Engineering and Liaoning Key Laboratory of Welding and Reliability of Rail Transportation Equipment, Dalian Jiaotong University, Dalian, China
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