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Activator for magnesium alloy welding

A technology of activator and magnesium alloy, applied in welding medium, welding equipment, welding equipment and other directions, can solve the problem of no formula of magnesium alloy activator, and achieve the effect of reducing deformation, reducing heat input and high production efficiency

Inactive Publication Date: 2008-08-20
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, people have proposed activator formulations for welding low-carbon steel, stainless steel, titanium alloys, aluminum alloys, etc., but have not yet proposed activator formulations for magnesium alloys.

Method used

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  • Activator for magnesium alloy welding
  • Activator for magnesium alloy welding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Active agent weight ratio is: TiO 2 58.6%, Cr 2 o 3 9.7%, MgO 7.3%, MnO 2 12.7%, CaO 11.7%, put the above components in the grinding equipment to fully grind, after drying and cooling, mix with acetone or alcohol and evenly coat or spray on the surface of the bead to be welded, the thickness of coating or spraying is at least It is advisable to cover the natural color of the base metal, the width is about 20mm, and the consumption of activator per meter of weld bead is about 0.5g, and the welding is performed after the acetone or alcohol volatilizes.

[0012] The welding specifications adopted for argon tungsten arc welding of magnesium alloy plates with a plate thickness of 6, 8, and 10 mm are:

[0013] plate thickness

[0014] When using this active agent, the depth of penetration is increased by 2 times. For the butt joint of magnesium alloys below 10mm, there is no need to open a bevel, and the straight edge is used for the butt joint without leaving...

Embodiment 2

[0016] Active agent weight ratio is: TiO 2 40%, Cr 2 o 3 20%, MgO 20%, MnO 2 10%, CaO 10%, put the above components in the grinding equipment to fully grind, after drying and cooling, mix with acetone or alcohol and evenly apply or spray on the surface of the weld bead to be welded, the thickness of the coating or spraying is at least It is advisable to cover the natural color of the base metal, the width is about 20mm, and the consumption of activator per meter of weld bead is about 0.5g, and the welding is performed after the acetone or alcohol volatilizes. The welding specification is the same as in Example 1.

Embodiment 3

[0018] Active agent weight ratio is: TiO 2 70%, Cr 2 o 3 18%, MgO 2%, MnO 2 5%, CaO 5%, put the above-mentioned components in the grinding equipment to fully grind, mix evenly, dry and cool, mix with acetone or alcohol and evenly coat or spray on the surface of the weld bead to be welded, coat or The thickness of the spraying should be able to cover the original color of the base metal. The width is about 20mm. The consumption of activator per meter of weld bead is about 0.5g. It can be welded after the acetone or alcohol volatilizes. Weld with 500WYAG laser, and the straight edge will not leave any cracks. For gap butt welding of 2.5mm thick magnesium alloy plates, the welding specifications are:

[0019]

[0020] Under such standard conditions, the penetration depth without active agent is only 0.8-1mm, and the penetration depth with active agent is 2.5mm, achieving complete penetration. After using the active agent, the penetration depth can be more than doubled.

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Abstract

The invention relates to an active agent applying to magnesium alloy welding, belonging to the material engineering technical field, which is characterized in that: the active agent is composed of TiO2, Cr2O3, MgO, MnO2, and CaO and the weight proportion is TiO2: 40 to 70%, Cr2O3: 5 to 20%, MgO: 2 to 20%, MnO2: 5 to 20%, CaO: 5 to 20%. Firstly, the active agent is grinded to powder, then is dried and cooled; secondly, the active agent is mixed with acetone or alcohol and then is equally coated or sprayed on the surface of the welding bead; finally, after the acetone or the alcohol is volatilized, welding can be implemented. The active agent has the advantages that: the weld penetration can increase at least twice; the weld joint of magnesium alloy is well moulded; the joint is of high quality and the intensity can be above the 95% of the intensity of the parent metal; the deformation due to welding is reduced; the invention is of easy operation and high productivity.

Description

[0001] The invention belongs to the technical field of material engineering, and relates to an active agent used in a magnesium alloy welding process. Background technique [0002] Magnesium alloy has a high strength / weight ratio, good noise reduction and shock absorption performance, can be recycled and meets environmental protection requirements, and has a wide range of applications in transportation, light industrial building materials, communications, electronics, aerospace and other fields potential. The development level of magnesium alloy joining technology is one of the key factors affecting the wide application of magnesium alloys. Due to the high thermal conductivity of magnesium alloys, the welding of magnesium alloys has the disadvantages of shallow penetration and low welding efficiency. For example, argon tungsten arc welding single-pass welding of magnesium alloy, the penetration depth is only about 3mm, for thick plates above 3mm, it needs to be grooved and fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/362B23K9/235B23K103/08
Inventor 刘黎明张兆栋
Owner DALIAN UNIV OF TECH
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