The research on the theory of fusion formation for the resistance welding machine has created conditions for the development of new materials, new processes, new equipment, joint quality control technology, etc. Therefore, it not only has a high theoretical significance of learning, but also has a great practical value of engineering, the research on the theory and method of fusion treatment of spot welding has obtained:
1. obtain all coagulated to weave as equiaxed crystal spot welding core.
2. For the first time, equiaxed crystal zone appears at the spot welding core bonding surface which is all columnar.
3. expand the core equiaxed crystal region, reduce the core columnar crystal region, so that the solidification grain is significantly refined.
The results show that inoculation can significantly improve the mechanical properties of spot welding joints, especially the fatigue strength for the poor weldability of materials, which opens up a new way for spot welding quality monitoring technology, and fundamentally improve the quality of spot welding joints.
At the same time, it has been reported that the use of external constant magnetic field can affect the movement and crystallization process of liquid metal inside the molten core, change the crystallization type, (columnar crystal – columnar crystal + isaaxial crystal) refine the grain and reduce the probability of shrinkage, cracking and other macro occurrences, which improves the mechanical properties of the joint, the effect is significant in high-strength steel spot welding.
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Post time: May-14-2024