Welding method for low-carbon high-strength steel

Abstract

The invention provides a welding method for low-carbon high-strength steel. The welding method for the low-carbon high-strength steel comprises the following steps of: 1) forming a welding groove on the low-carbon high-strength steel with a laser blanking method, and forming a welding line between the welding grooves of two pieces of low-carbon high-strength steel to be welded; and 2) welding the welding line by consumable electrode mixed gas metal arc welding, filling a welding wire in the welding process, and ensuring that the welding environment temperature is higher than 5DEG C. Specifically, the step 2) comprises the following steps of: 21) carrying out backing weld to the welding line by non-pulse consumable electrode mixed gas metal arc welding, forming a backing weld layer on the bottom of the welding line, and filling the welding wire in the welding process; and 22) carrying out cosmetic welding to the welding line by pulse consumable electrode mixed gas metal arc welding, forming a plurality of cosmetic layers above the backing weld layer, ensuring that two adjacent cosmetic layers are provided with overlay regions, and filling welding wire in the welding process. According to the welding method for the low-carbon high-strength steel, the stress concentration is lowered, and the welding quality of the low-carbon high-strength steel is improved.

Description

technical field [0001] The invention relates to the field of plate welding, in particular to a welding method for low-carbon high-strength steel. Background technique [0002] At present, low-carbon high-strength steel, with high strength, low expansion coefficient and stable elastic modulus, is an ideal material for high-strength products such as shipbuilding, pressure vessels, locomotive manufacturing, and engineering machinery. Low-carbon high-strength steel (for example: HG785D low-carbon quenched and tempered steel) has a low carbon content, generally no more than 0.12. Its high strength and good comprehensive mechanical properties are achieved by adding a variety of hardenability on the basis of low carbon. Alloying elements and quenching and tempering treatment to obtain low-carbon lath martensite and granular bainite with high strength and good toughness. During the welding process, low-carbon high-strength steel has a large tendency to harden, strong sensitivity to...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: provide a welding method for low-carbon high-strength steel, solve the defect of low welding quality of low-carbon high-strength steel in the prior art, and realize the improvement of welding quality of low-carbon high-strength steel

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