The durability of steel in China prepainted color galvanized coil factory is mainly its corrosion resistance function, about the steel structure exposed to the air for a long time or often in the alternate environment of dry and wet, it is easier to produce corrosion damage. The damage of corrosion to steel structure is not only limited to the uniform weakening of effective section of steel, but also the resulting local rust pits will result in stress concentration, thus reducing the bearing capacity of the structure. Make it produce brittle failure.
The weldability of rolled steel in China prepainted color galvanized coil factory refers to whether the welds can meet the quality requirements under the given construction mode and welding technology conditions. The steel with poor welding function is prone to brittle cracks in the heat affected zone of welding, and it is not easy to guarantee the welding quality unless a specific random welding technology is selected. Therefore, the welding function of the steel used should be evaluated for the important welding structure bearing dynamic load. The welding function of steel can be tested by the specimen of test weld to determine the fatigue strength, plasticity and impact toughness of steel in the weld and its heat affected zone.