Normalizing is a heat treatment that improves the toughness of steel. After the steel components are heated to 30-50°C above the Ac3 temperature, they are kept for a period of time and then air cooled. The main feature is that the cooling rate is faster than annealing but lower than quenching. During normalizing, the crystal grains of the steel A709 Gr 50W bridge steel plate can be refined in a slightly faster cooling. Not only can satisfactory strength be obtained, but also the toughness (AKV value) can be significantly improved and reduced The tendency of the component to crack.
A709 Gr 50W bridge steel plate, Q460C steel plate is a kind of low-alloy high-strength steel. In the grade Q460C, Q represents the yield strength of steel, and Q is the capital of the first letter in Chinese Pinyin "Qu"; 460 represents 460 MPa, and mega is the 6th power of 10. Pa is the pressure unit Pascal; C—quality grade is C grade (grades are divided into C, D, E).
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Laser cutting is that the horizontal laser beam emitted by the laser changes into a vertical downward laser beam through the 45° total reflector, and then focuses through the lens, forming a tiny spot at the focal point. When the spot hits the material, the material is heated to the vaporization temperature quickly, and evaporates to form a hole. With the movement of the beam on the material such as A709 Gr 50W bridge steel plate, the auxiliary gas (carbon dioxide gas, oxygen, Nitrogen, etc.) blow away the melted slag, make the hole continuously form a very narrow width (such as about 0.1mm) cutting seam, and complete the cutting of materials.
