装载机后车架焊接顺序优化的数值仿真.docx

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I. Introduction
Welding is one of the most crucial steps in the manufacturing process of construction equipment such as loaders. The welding process requires careful consideration of various factors such as environmental factors, material selection, welding technique, and welding sequence. Welding sequence plays a vital role in the weld quality, welding productivity, and weld distortion. This study aims to optimize the welding sequence of the rear frame of a loader using numerical simulation.
II. Welding Process
The welding process used in this study is Gas Metal Arc Welding (GMAW), commonly known as MIG (Metal Inert Gas) welding. MIG welding is widely used in the manufacturing industry for welding thick sections of mild steel and aluminum.
III. Numerical Simulation
The numerical simulation was performed using ANSYS software. The simulation model consisted of a solid model of the rear frame of the loader used in the study. The simulation was carried out on the basis of the following assumptions:
1. The material used for the rear frame was mild steel with uniform material properties.
2. The welding heat input was assumed to be constant.
3. The weld bead width was assumed to be uniform along the length of the weld.
IV. Simulation Results
The simulation results indicated that the welding sequence significantly affects the welding-induced deformation of the rear frame. The simulation results showed that introducing heat to the frame in a particular sequence can reduce the distortion of the frame.
V. Welding Sequence Optimization
The optimization process was carried out using the Design of Experiment (DOE) method. The DOE method provided an effective way of determining the optimal welding sequence while minimizing the number of simulations required. From the DOE analysis, it was determined that the optimal welding sequence for the rear frame of the loader was as follows:
1. Weld the rear lower cross member to the side rails
2. Weld the two rear vertical plates to the side rails
3. Weld the forward and rearward cross members to the side rails
4. Weld the rear braces to the side rails
5. Weld the lower vertical plate to the side rails
6. Weld the front vertical plate to the side rails
VI. Conclusion
In conclusion, this study successfully optimized the welding sequence of the rear frame of a loader using numerical simulation. By optimizing the welding sequence, the welding-induced distortion of the frame was reduced, and the weld quality was improved. This study highlights the importance of carefully selecting the welding sequence in the welding process to achieve the desired results. The findings of this study can be applied in the manufacturing industry to improve the quality and efficiency of the welding process.