Welding technology of high strength lightweight steel

Abstract

The invention belongs to the technical field of welding, and discloses a welding technology of high strength lightweight steel. The welding technology comprises the following steps of preheating, specifically, steel to be welded is kept at a temperature of 300-350 DEG C for 20-30 min, and the thickness of the steel is 2-3.5 mm; welding, specifically, a welding assembly is obtained by using TIG welding technology, a welding voltage is 10-14 V, a welding current is 120-160 A, inert gas is used as protective gas in the welding process, the flow rate of the protective gas is 7-9 L / min, and a welding speed is 13-17 cm / min; and solid solution treatment, specifically, the welding assembly obtained from the step 2 is put into a heat treatment furnace with a temperature of 1000-1100 DEG C and is subjected to heat preservation for 30-45 min, and then the welding assembly is taken out and put into a 20-35 DEG C cooling medium for cooling. According to the technical scheme, the welding technologyfor the low-density Fe-Mn-Al-C series steel is provided, and the mechanical property of an obtained workpiece is high.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a high-strength light-weight steel welding process. Background technique [0002] With the continuous and rapid development of China's economy, the number of motor vehicles has continued to grow rapidly. By the end of 2018, the number of motor vehicles nationwide had reached 327 million. Studies have shown that the fuel consumption of a car is in a linear relationship with its body weight. Under the premise that other conditions remain unchanged, every 10% reduction in car weight can reduce fuel consumption by 6-8%, and every reduction in fuel consumption by 1L will reduce emissions. 2.45kg of CO 2 , it can be seen that reducing the emission of automobile exhaust has a very large impact on the environment. In addition, in the field of aerospace, the weight reduction of spacecraft is also of great significance. It not only reduces fuel consumption and emissions, but...

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Problems solved by technology

[0004] In addition, since the current Fe-Mn-Al-C series low-density steel is still in the theoretical research stage and has not been put into actual production and application, the preparation and welding process of this series of materials are in the stage of exploration, and the commonly used welding of steel methods, such as arc welding, CO 2 Shielded welding etc. find that these techniques have a lot of unfavorable influences on the weldability of Fe-Mn-Al-C series low-density steel by inventor's test, so the present invention mainly is to find a kind of being applicable to Fe-Mn-Al- The welding process of C-series low-density steel ensures that the mechanical properties of Fe-Mn-Al-C-series low-density steel are improved after welding

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