Preparation and welding method of intermediate layer composite powder for magnesium alloy steel laser welding

A technology of laser welding and composite powder, which is applied in the direction of laser welding equipment, welding equipment, welding equipment, etc., can solve the problem of low tensile and shear force of welding joints, improve tensile and shear force, promote uniform and stable generation, reduce The effect of welding defects

Active Publication Date: 2021-07-23
NANCHANG UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the current study, Cu alone as an intermediate layer can generate a continuous and stable Fe-Al phase at the joint magnesium / steel interface, improving the stability of the welding process, but the tensile and shear strength of the welded joint is low

Method used

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  • Preparation and welding method of intermediate layer composite powder for magnesium alloy steel laser welding
  • Preparation and welding method of intermediate layer composite powder for magnesium alloy steel laser welding
  • Preparation and welding method of intermediate layer composite powder for magnesium alloy steel laser welding

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preparation example Construction

[0023] The invention provides a method for preparing a middle layer composite powder for laser welding of magnesium alloy steel, which is suitable for the welding method of the middle layer composite powder for laser welding of magnesium alloy steel, including:

[0024] Based on the set mass ratio, the interlayer composite powder is made by using pure Cu powder and pure Si powder with a purity of 99.9%, wherein the mass ratio of Cu is 80%-98%, and Si is 2%-20%.

[0025] In this embodiment, based on the set mass ratio, pure Cu powder with a purity of 99.9% and pure Si powder are used to make the interlayer composite powder, wherein the mass ratio is 80%-98% for Cu and 2% for Si -20%, the thickness is 50-300μm.

[0026] The present invention will be further illustrated by the following examples

Embodiment 1

[0028] The base material is 105mm×45mm×0.8mm DP590 galvanized dual-phase steel and 105mm×45mm×1mm AZ31B magnesium alloy, the middle layer is made of pure Cu powder with a purity of 99.9% and pure Si powder with a mass ratio of 95% Cu-5%Si composite powder with a thickness of 130μm. The base metal is polished with sandpaper, washed with acetone and dried, and then fixed in the form of "steel on magnesium and bottom" lap joint, with a lap length of 20mm. Laser laser process parameters are laser power of 800W, welding speed of 0.05m / s, defocus of 0mm, protective gas of 99.99% argon, side blowing, and gas flow rate of 22L / min. The laser head deviates 5° along the direction of vertical laser travel. Such as figure 2 and image 3 As shown, the tensile shear force tested by a universal tensile machine is 81.9N / mm.

Embodiment 2

[0030] The base material is DP590 galvanized dual-phase steel of 105mm×45mm×0.8mm and AZ31B magnesium alloy of 105mm×45mm×1mm, and the middle layer is made of pure Cu powder with a purity of 99.9% and pure Si powder with a mass ratio of 92% Cu-8%Si composite powder with a thickness of 130μm. The base metal is polished with sandpaper, washed with acetone and dried, and then fixed in the form of "steel on magnesium and bottom" lap joint, with a lap length of 20mm. Laser laser process parameters are laser power of 800W, welding speed of 0.05m / s, defocus of 0mm, protective gas of 99.99% argon, side blowing, and gas flow rate of 22L / min. The laser head deviates 5° along the direction of vertical laser travel. The tensile shear force tested by a universal tensile machine was 76.6N / mm.

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Abstract

The invention discloses a preparation and welding method of intermediate layer composite powder for magnesium alloy steel laser welding. Dual-phase steel and magnesium alloy are in a lap joint form of upper steel and lower magnesium, an intermediate layer adopts Cu powder and Si powder with the purity being 99.9%, and laser welding is carried out on the intermediate layer composite powder prepared by uniformly mixing the Cu powder and the Si powder according to different mass ratios. The method has the technical effects that the Cu element improves the stability of the welding process, reduces the generation of welding defects and promotes the uniform and stable generation of a Fe-Al layer at an Mg / Fe interface in a welding seam, and addition of the Si element can convert a Fe-Al phase with relatively high brittleness in a Fe-Al reaction layer into a Fe-Si-Al phase with relatively low brittleness, so that the tensile shear force of a magnesium alloy / steel welding joint is improved.

Description

technical field [0001] The invention relates to the technical field of laser welding of dissimilar metals, in particular to the preparation and welding method of an intermediate layer composite powder for laser welding of magnesium alloy steel. Background technique [0002] Laser welding has the advantages of high energy density, fast welding speed, small welding deformation, and a wide range of weldable materials. It has great advantages in realizing high-quality and efficient connection of magnesium alloy / steel. Due to the large difference in thermophysical properties such as thermal expansion coefficient and melting and boiling point between magnesium and steel, the mutual insolubility between the two and the inability to form intermetallic compounds (IMC), etc., there are certain problems in obtaining a good welded joint between magnesium and steel. Difficulties. However, adding an intermediate layer between magnesium / steel during welding can effectively realize the wel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/21B23K26/323B23K26/60B23K35/30B23K35/36
CPCB23K26/21B23K26/323B23K26/60B23K35/302B23K35/3607
Inventor 张华杨帆雷敏曾遨日
Owner NANCHANG UNIV
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