A high-strength low-density steel welding process

Abstract

The invention discloses a high-strength low-density steel welding process, which belongs to the technical field of steel processing. The temperature during welding can promote the thermal decomposition of calcium bicarbonate powder in the built-in storage cavity and generate a large amount of carbon dioxide gas. The increase of air pressure and temperature can make the thermally variable guide rope return to its high-temperature phase state, thereby lifting the rubber sealing sheet upwards, so as to promote the release of carbon dioxide. On the one hand, it can reduce The possibility of the external temperature of the steel is too high. On the other hand, the release of carbon dioxide can reduce the possibility of the steel being oxidized due to high temperature during the welding process. At the same time, the expansion of the attached guide ball can relieve the built-in magnetic The spherical magnetic shield makes the bottom of the anti-oxidation block stick closely to the steel, which can not only accelerate the thermal decomposition of the calcium bicarbonate powder, but also reduce the gap between the anti-oxidation block and the steel, thereby reducing the oxidation of the steel.

Description

technical field [0001] The invention relates to the technical field of steel processing, more specifically, to a high-strength low-density steel welding process. Background technique [0002] With the continuous and rapid development of China's economy, the number of motor vehicles continues to maintain a rapid growth trend. By the end of 2018, the number of motor vehicles in the country reached 327 million. Research shows that: the fuel consumption of automobiles has a linear relationship with the weight of the body, and other conditions remain unchanged. Under the premise that the vehicle weight is reduced by 10%, the fuel consumption can be reduced by 6-8%, and every 1L fuel consumption reduction will reduce the emission of 2.45kg of CO2. It can be seen that the impact of reducing vehicle exhaust emissions on the environment is very great. In addition, in the field of aerospace, the weight reduction of spacecraft is also of great significance. It not only reduces fuel con...

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Problems solved by technology

[0004] It is a low-density steel. Due to its excellent mechanical properties, low density, and corrosion resistance, it can be developed as a lightweight automobile body material with low energy consumption and low CO2 emissions. In the prior art, Fe-Mn-Al -When C-series low-density steel is welded, due to the high temperature, the surrounding unwelded parts may be oxidized, thereby reducing the yield rate of the steel after production

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