High-strength low-density steel welding process

Abstract

The invention discloses a high-strength low-density steel welding process, and belongs to the technical field of steel processing. The scheme can promote calcium bicarbonate powder in a built-in storage cavity to be heated and decomposed and generate a large amount of carbon dioxide gas through the temperature during welding, and along with the increase of air pressure and the increase of temperature, a heat-variable guide rope can be promoted to recover to the high-temperature phase state, so that rubber sealing sheets are lifted upwards to promote the release of carbon dioxide, on one hand,the possibility of overhigh external temperature of the steel is reduced by virtue of the thermal decomposition of calcium bicarbonate powder, on the other hand, by virtue of the release of carbon dioxide, the possibility of steel oxidation due to too high temperature in the welding process is reduced, meanwhile, by means of expansion of an attachment guide ball, magnetic shielding on a built-in magnetic ball can be relieved, the bottom side of an anti-oxidation attachment block is promoted to be tightly attached to the steel, thermal decomposition of the calcium bicarbonate powder can be accelerated, gaps between the anti-oxidation attachment block and the steel can be reduced, and therefore oxidation of the steel is reduced.

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

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