Welding performance and welding process analysis of A588 Grade A weathering steel sheet

Welding performance and welding process analysis of A588 Grade A weathering steel sheet

Weathering steel sheet A588 Grade A is a type of high strength, low alloy structural steel with up to 50 ksi minimum yield point featuring atmospheric corrosion resistance. As a natural beauty and aging potential, weathering steel sheet A588 Grade A has been widely used in many industries. Therefore, it is important to study its welding performance and welding process.

The chemical composition of weathering steel sheet A588 Grade A is as follows: 0.19% carbon, 0.80% manganese, 0.75% silicon, 0.030% phosphorus, 0.025% sulfur and 0.20% copper. Its mechanical properties in the delivery state are 520-680Mpa and 25% elongation. Therefore, its welding performance and welding process should also be mastered to ensure the quality of welds.

Welding performance of A588 Grade A weathering steel sheet:Due to the high content of alloy elements in the chemical composition of A588 Grade A weathering steel sheet, it has good weldability. It is important to select a proper welding process and take corresponding welding measures to ensure the quality of welding connections. Generally, the welding connection process of A588 Grade A weathering steel sheet is similar to that of low carbon steel, but preheating and postwrinkle elimination treatment should be done when welding.

Welding process of A588 Grade A weathering steel sheet: The welding process of A588 Grade A weathering steel sheet is recommended to be manual arc welding, including SMAW and FCAW. Preheating and postwrinkle elimination treatment in the welding process can effectively ensure the quality of welding, which can ensure that the weld is not embrittled in the heat treatment process. Preheating should be done before welding and must not be less than 70℃. When the thickness of welded joint exceeds 40mm, the preheating temperature is not lower than 200℃, and the preheating temperature of components with a thickness of 20mm is not lower than 150 ℃. In the postwrinkle elimination treatment, it is necessary to eliminate the wrinkles after welding on the welded component surface.

Finally, it is necessary to pay attention to the protection of the welding seam surface of weathering steel sheet A588 Grade A in the welding process. The protection measures can effectively prevent the welding seam surface from rusting and affecting the welding effect.

Therefore, the welding performance and welding process of A588 Grade A weathering steel sheet should be paid attention to in the engineering construction. Mastering the basic principles and welding methods of A588 Grade A weathering steel sheet can effectively ensure the quality of welds and welding connections.