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No rivet joining process develops rapidly in the automotive industry

2019-10-21

     

    Because the solid phase is connected, the connection temperature is usually lower than the melting point of the base metal (or metal intermediate layer), so pressure must be used to bring the surface to be joined into close contact in the solid state, through plastic deformation, recrystallization and diffusion. And achieve atomic bonding. The dominant role of pressure on the formation of joints is emphasized here. However, in some pressure welding processes, the metal in the weld zone is melted and pressure is applied at the same time. The process is heating, melting, metallurgical reaction, solidification, solid phase transformation, forming a joint, so strictly speaking, this is a liquid-solid phase. connection. Pressurization is the main method for pressure welding of rivet nut guns, but in order to improve metal plasticity, accelerate diffusion, and significantly reduce pressure and time, heating means are often used. Resistance welding, friction welding, explosion welding and ultrasonic welding are all pressure welding.

    

      The most widely used assembly process in the automotive industry is resistance spot welding, and the rivet-free joint process of Kunshan rivet-free joint machine manufacturers has proven to be reliable in mass production. Due to the above difficulties in connecting the aluminum plate and the mixed plate of the aluminum plate and the steel plate by the resistance spot welding process, the researchers began to consider the use of bonding techniques such as gluing, friction stir welding and riveting instead of the resistance spot welding method for connecting the aluminum plate and the aluminum plate. Mixed plate with steel plate. Although the adhesive bonding head has good fatigue properties, it is easily deformed when cured at a high temperature. Although friction stir welding can be free of welding deformation, the residual process holes after the end of stirring will weaken the static and dynamic mechanical properties of the joint, and the longer friction stir welding process time is not conducive to mass production. The traditional riveting process requires pre-punching the riveting material and then connecting with rivets; such a rivet-free joining process is complicated, the appearance quality is poor, the efficiency is low, and it is not easy to automate, which greatly limits the automation development of the riveting process. And thus has great limitations. Obviously, the application of new lightweight materials poses a new challenge to the application of thin-plate connection technology in the automotive industry.

    

    

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