The effect of the depth of the scraping on the service life of the vibration test platform is not negligible. The JJG117-91 verification procedure does not specify the depth of scraping, which is undoubtedly a defect. From the point of view of use, it will not cause the workpiece to be combined with the vibration granite platform platform.
The thermal stress is larger, and cracks are more likely to occur than arc welding, and the tendency of the line shrinkage to crack is greater. Because the crack tends to be affected by factors such as spray welding time and thickness of the spray layer, the size of the defect is limited, and the defects of the weld repair need to be cleaned up, because the proportion of Fe content in the dusting is higher.
The sprayed layer formed is closer to the color of the base material than the arc welding. However, since it has a certain amount of Ni, it cannot be made closer to the color of the base material, and can be machined after welding. The traditional spray welding and arc welding processes are prone to cracks after welding, and the workpiece is susceptible to thermal deformation.
Increase the contact area as much as possible to increase the service life of the vibration test platform. The JJG117-91 verification procedure also does not properly limit this item. In order to improve the service life of the platform and ensure the working accuracy, it is recommended to have a depth of 0.02mm or more for the scraping depth, which ensures a long service life and verification cycle of the vibration experimental platform.
According to the spray welding process, the surface of the guide rail is preheated to above 150 ° C. After the initial welding powder is sprayed, the sprayed surface is warmed to above 900 ° C - 1200 ° C.
The solder powder is melted to form a flat surface. Due to the pre-warming and heating time of the granite platform, the workpiece has a large heating area.
It is easy to appear secondary pores, and the difference between the metal color and the base metal at the weld repair is the common feature. This is also the fundamental reason why the traditional welding repair process cannot completely solve the defect repair of the machine guide rail.
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