Preprocessing method and welding stamping method for improving steel welding performance

Abstract

The invention discloses a preprocessing method and a welding stamping method for improving the steel welding performance. The preprocessing method comprises the following steps that 1, an aluminum-silicon coating steel plate which is made of a first matrix material (1), a first coating (101) and a second coating (102) is obtained, the aluminum-silicon coating steel plate which is composed of a second base body material (2), a third coating layer (201) and a fourth coating layer (202) is obtained, the first coating and the second coating are composed of a first aluminum layer (11) and a first intermetallic compound layer (12), and the third coating layer and the fourth coating layer are composed of a second aluminum layer (21) and a second intermetallic compound layer (22); 2, the first aluminum layer and the second aluminum layer are 100 % removed by plasma ablation, the first intermetallic compound layer and the second aluminum layer are 0-100 % removed by the plasma ablation, and a first stripping region (13) and a second stripping region (23) are formed; and 3, the aluminum-silicon coating steel plate is welded through the first stripping region and the second stripping region.

Description

technical field [0001] The invention relates to the field of manufacturing and processing of steel plates, in particular to a pretreatment method and a welding stamping method for improving the welding performance of steel materials. Background technique [0002] At present, a new type of steel plate with an aluminum-silicon coating is circulating on the market, and the existence of the aluminum-silicon coating has an adverse effect on the welding of the steel plate. Elements such as aluminum are easy to enter the weld metal and remain to form residues. The residues can easily lead to poor mechanical properties of welded joints, such as reduced tensile strength, and also have a certain impact on high temperature resistance and corrosion performance. Therefore, for steel plates The pretreatment operation before welding is very important. Retaining a thicker coating will cause the aluminum alloy content to be too high, and not retaining the coating at all will result in little...

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Problems solved by technology

[0003] The invention patent application with Chinese Patent Publication No. CN106232285A discloses a steel welded part with aluminum or aluminum alloy coating and its manufacturing method. The method peels off 100% of the aluminum layer on the surface and retains 100% of the intermetallic compound layer; Chinese Patent Publication No. CN206105157U patent application for invention discloses a method and apparatus for preparing aluminum-coated steel sheets intended for welding and subsequently hardened under pressure, corresponding to welded blanks, the method strips 90-95% of the aluminum layer is retained, 5-10% of the aluminum layer and 100% of the intermetallic compound layer are retained; the content of the intermetallic compound layer is relatively high, and a variety of iron-aluminum intermetallic brittleness will be formed in some specific environments Phase: such as some specific non-equilibrium crystallization; some specific alloys brought by the welding wire during wire filler welding, such as metal nickel, chromium, etc., lead to poor toughness of the material, especially in some special environments, such as ultra-low temperature conditions

Therefore, completely peeling off 100% of the compound layer is not good for the welding of steel

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