In the early days, many bridges in foreign countries us […]
In the early days, many bridges in foreign countries used riveting technology. Our country was also riveted bridges before. With the continuous development of bridge construction, welding technology has become more and more widely used. The relevant technicians are concerned about the service life of riveted bridges. A safety assessment was conducted, and it was found that there are actually problems with welding.
The early welded bridges caused many problems due to inadequate materials and processes.
In the traditional welding form, there is stress concentration in the welding area after welding, the metal becomes brittle, and it is easy to produce blisters, bubbles, and micro-cracks. When these components work for a long time in a vibrating environment, cracks will develop in the welding place, and finally fatigue Fractures pose a threat to engineering safety, especially in high-risk areas such as high-speed locomotives and aerospace. Therefore, relatively safe riveting methods are widely used.
The riveting process can realize the connection of steel, aluminum, and plastic materials, with low energy consumption, and the process quality can be self-monitored during the process. Generally, joint combinations of different materials, thickness, and hardness require different rivets, punches and dies, and the cost of rivets is high. The equipment system cost is much higher than resistance spot welding.