What are the effects of welding process on weather-resistant steel plates

October 20, 2023

On the issue of the welding process of the weather-resistant steel plate, what are the effects of the specific welding process on the weather-resistant steel plate? As a weather-resistant steel tree pool manufacturer, take you to understand!

The welding process is related to the welding method and other elements. The requirements are based on the data of the workpiece to be welded, brand, chemical composition, type of weldment structure and welding function requirements to confirm the operation.

After welding, it should be held at 200-350 ° C for 2-6 hours to further reduce the cooling rate, add plasticity and toughness, and reduce the hardening trend, and eliminate dispersed hydrogen in the joint. Therefore, welding cannot be performed in cold environments or rainy days. It is good to carry out stress relief heat treatment on welds immediately after welding, especially for large thickness welds, high stiffness structural parts and welds working under harsh conditions (dynamic load or impact load). The tempering temperature for stress relief after welding is 600-650 ° C, the heat preservation is 1-2h, and then the furnace is cooled.

If stress relief heat treatment cannot be performed after welding, post-heat treatment should be performed immediately. Welding is the use of heat, pressure or both, with or without welding data, so that the two workpieces produce mutual dispersion between atoms, thus constituting a metallurgical bonding process and articulation. Welding is widely used in both metal and non-metal applications.

The hot rolled S355J2W weather-resistant steel plate in 300? Microstructure and function after welding at different temperatures of 880℃. The results show that S355J2W hot rolled steel plate has certain deformation grains and is annealed at a lower temperature. At temperature (300? At 650℃), the ferrite in the steel plate recrystallized and the grain grew, and gradually became equiaxial. When the heat treatment temperature exceeds the eutectoid change temperature but does not reach the full austenitizing temperature, a part of the undissolved carbide remains. When the steel plate is normalized at 880°C, the weather-resistant steel plate is austenitized, and these austenites experience quasi-eutectoid phase changes in the subsequent cooling process, forming a large piece of pearlite + ferrite, which is composed of a large grain size of ferrite and a large grain size of crystal. With the increase of heat treatment temperature, the yield strength of steel plate shows an increasing trend, but when the heat treatment temperature reaches 800℃ or more, the physical yield strength of steel plate disappears. Tensile strength increases sharply, yield ratio decreases and elongation decreases. The results of three-dimensional atomic probe show that the lack of carbon atoms in ferrite is the main reason for the disappearance of physical obedience of red rust weathering steel plate.

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