Method for welding medium-carbon quenched and tempered alloy steel and ordinary low-carbon steel

Abstract

The invention discloses a method for welding medium-carbon quenched and tempered alloy steel and ordinary low-carbon steel, and belongs to the technical field of welding. The method includes providing one metal transition layer with strength ranging between that of the medium-carbon quenched and tempered alloy steel and the ordinary low-carbon steel and thickness being larger than sum of width of welding joint heat-affected zones of the medium-carbon quenched and tempered alloy steel and the ordinary low-carbon steel; welding the medium-carbon quenched and tempered alloy steel and the metal transition layer to form a first workpiece; welding the metal transition layer of the first workpiece with the ordinary low-carbon steel. According to above technical scheme, the two welding joint heat-affected zones formed by the metal transition layer and the medium-carbon quenched and tempered alloy steel and the ordinary low-carbon steel cannot be overlapped, welding cracks are less prone to being caused in the welding joint heat-affected zone close to one side of the medium-carbon quenched and tempered alloy steel after being welded, so that a welded joint is high in toughness and good in reliability.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a method for welding medium-carbon quenched and tempered alloy steel and common low-carbon steel. Background technique [0002] As we all know, medium-carbon quenched and tempered alloy steel has high strength and good comprehensive mechanical properties, and its performance in all aspects is obviously better than that of carbon steel. It has been widely used in important stressed structural parts in the field of shipbuilding. In order to improve the reliability of medium-carbon quenched and tempered alloy steel, a reinforcement plate is usually connected to the medium-carbon quenched and tempered alloy steel. Considering the connection process and economic cost, the material of the rib plate is generally selected as ordinary low-carbon steel. Due to the dual factors of working conditions and working environment, the joints between medium-carbon quenched and tempered alloy steel...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for welding medium-carbon quenched and tempered alloy steel and ordinary low-carbon steel, which can not only solve the relatively high restraint stress of welded joints caused by the direct welding of existing medium-carbon quenched and tempered alloy steel and ordinary low-carbon steel Large, after welding, the heat-affected zone of the weld close to the base metal of medium-carbon quenched and tempered alloy steel is very prone to welding cracks, and it can also solve the problem of weld metal and medium-carbon quenched and tempered alloy in the existing surfacing welding transition layer welding method The heat-affected zones of the two welds formed by steel and ordinary low-carbon steel intersect, resulting in aggravated embrittlement of welded joints between medium-carbon quenched and tempered alloy steel and ordinary low-carbon steel

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