Views:0 Author:Site Editor Publish Time: 2021-11-09 Origin:Site
Light-weight steel structures or parts are usually connected by welds, bolts, or rivets, which have a great impact on our production and life. So what are the performance indicators of lightweight steel structures? Let's take a look at it together.
This is the content list:
Cold bending performance
Cold bending performance
The cold bending performance of lightweight steel structures is a measure of the ability of steel to resist cracks when it is bent at room temperature to produce plastic deformation. The cold bending performance of the steel structure is to use the cold bending test to test the bending deformation performance of the steel to withstand the specified degree of bending.
The impact toughness of lightweight steel structures refers to the ability of steel to absorb mechanical kinetic energy during the fracture process under impact load. It is a mechanical property that measures the resistance of lightweight steel structures to impact loads. Impact loads may cause brittle fracture due to low temperature and stress concentration. Generally, the impact toughness index of steel structure is obtained through the impact test of standard specimens.
The welding performance of lightweight steel structures refers to obtaining good performance welded joints under certain welding process conditions. The welding performance of light-weight steel structures can be divided into welding performance during welding and welding performance in use. The welding performance of the steel structure during welding refers to the sensitivity of the weld and the metal near the weld without heat cracks or cold shrinkage cracks during the welding process. Good welding performance means that under certain welding process conditions, there will be no cracks in the weld metal and the nearby base metal. Welding performance in the service performance of light-weight steel structures refers to the impact toughness of the weld and the ductility of the heat-affected zone. The mechanical properties of steel structure welds and heat-affected zone steel shall not be lower than the mechanical properties of the base material. Our country's steel structure adopts the welding performance test method of welding technology and also adopts the usability test method of welding performance.
Many factors affect the durability of lightweight steel structures. First, the corrosion resistance of the steel structure is poor, and protective measures must be taken to prevent the steel from corroding and rusting. Protection measures for light-weight steel structures include regular maintenance of steel paint, galvanized steel sheets, and special protection measures under conditions of strong corrosive media such as acid, alkali, salt, etc., such as "anode protection" for offshore platform steel structures to prevent jackets corrosion. Fix the zinc ingot on the jacket, the seawater electrolyte will automatically corrode the zinc ingot first to achieve the function of protecting the steel jacket. Secondly, because the destructive strength of lightweight steel structures under high temperature and long-term load is much lower than short-term strength, the durable strength of steel under long-term high temperature should be measured. The steel structure will automatically become hard and brittle over time, which is the phenomenon of "aging".
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