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Alloy powder filling tungsten argon arc welding method for magnesium alloys

A technology of argon tungsten arc welding and alloy powder, applied in welding equipment, arc welding equipment, metal processing equipment, etc., can solve the problem of low welding speed and deposition efficiency, high wire feeding accuracy requirements, and low arc power density and other problems, to achieve the effect of high deposition efficiency, lower assembly precision requirements, and large welding penetration

Inactive Publication Date: 2015-07-15
CHONGQING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] 1. Low welding efficiency and small penetration depth
Due to the limited capacity of the tungsten electrode to carry current, and the expansion of the free arc shape, the power density of the arc is small, so that the formed weld penetration is shallow, the welding speed and deposition efficiency are not high, and the production efficiency is low when welding medium and thick plates.
[0005] 2. Large stomatal tendency
Magnesium can dissolve a certain amount of gas at high temperature, while the protective gas argon used in conventional argon tungsten arc welding without filler materials has no deoxidation and dehydrogenation effects, and the welding process is sensitive to pores
[0006] 3. When automatic wire feeding is used for welding, the wire feeding system is relatively complicated, and the wire feeding accuracy is required to be high; when manual wire feeding is used for welding, the wire feeding efficiency is low, and continuous welding production of long welds cannot be carried out

Method used

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  • Alloy powder filling tungsten argon arc welding method for magnesium alloys
  • Alloy powder filling tungsten argon arc welding method for magnesium alloys
  • Alloy powder filling tungsten argon arc welding method for magnesium alloys

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Embodiment 1: as image 3 As shown, the magnesium alloy workpiece 2 to be welded is the butt joint of two flat plate structures with a thickness of 6 mm. The workpiece 2 has a 30° V-shaped groove, and the height of the blunt edge is 2 mm. The two workpieces 2 are clamped by the clamp without leaving any assembly gap. Set the welding current to 120A, the welding speed to 12m / h, the flow rate of shielding gas 14 to 12L / min, the flow rate of powder feeding working gas 15 to 4L / min, the amount of alloy powder feeding to 150g / min, and the diameter of tungsten electrode 8 to be 2.4 mm. Alloy powder material consists of 6% SiO by weight 2 Powder, 4%TiO 2 powder and the balance of Mg powder, the alloy powder material is dried and placed in the powder feeding mechanism 1, and the alignment between the tungsten electrode 8 and the powder feeding nozzle 3 is corrected so that the extension line of the tungsten electrode 8 and the powder feeding nozzle 3 are sprayed along T...

Embodiment 2

[0035] Embodiment 2: as Figure 4 As shown, the magnesium alloy workpiece 2 to be welded is the butt joint of two flat plate structures with a thickness of 3 mm. The workpiece 2 is not beveled, and the two workpieces 2 are clamped by a clamp with an assembly gap of 1 mm. Alloy powder material consists of 6% SiO by weight 2 Powder, 4% TiO 2 powder and the balance of Mg powder, the alloy powder material is dried, mixed thoroughly with acetone solution, and evenly brushed and filled in the reserved gap of the workpiece 2 to be welded, and a certain layer of alloy powder is formed on the surface of the welded part. The acetone solution in the preset alloy powder 17 is completely volatilized. Set the welding current to 120A, the welding speed to 10m / h, the flow rate of the shielding gas 14 to 12L / min, and the diameter of the tungsten electrode 8 to 2.4mm. Turn on the argon tungsten arc welding torch 4 to supply gas in advance to protect the area to be welded, and then ignite the...

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Abstract

The invention discloses a tungsten argon arc welding method, which is applied to magnesium alloy materials and uses alloy powder as welding and filling materials. Besides magnesium powder, the magnesium base alloy powder used in the method further comprises an active powder component and an arc stabilizer powder component. The magnesium base alloy powder is added into welding lines of the magnesium alloy materials to be welded by means of automatic filling, homogeneous materials can be welded, dissimilar materials can also be welded, and the technical problems of low welding efficiency and large air hole inclination in the process of tungsten argon arc welding can be solved, so that high-quality welding joints are obtained.

Description

technical field [0001] The invention relates to a magnesium alloy alloy powder filled tungsten argon arc welding method, which is suitable for welding magnesium and magnesium alloy materials. Background technique [0002] Magnesium alloy has low density, high specific strength and specific stiffness, good thermal and electrical conductivity, excellent damping and shock absorption, and electromagnetic shielding. As the lightest metal structural material in practical application, magnesium alloy is easy to process and form, easy to recycle and degrade. It is precisely because of these characteristics that magnesium alloys have broad application prospects in aerospace, automobiles, weapons, electronics and other fields. [0003] Due to the characteristics of high thermal conductivity, large thermal expansion coefficient, low melting point and easy oxidation of magnesium alloy, its weldability is poor, and problems such as cracks, pores, spatter, inclusions, and large d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/167
Inventor 罗怡叶宏吴玮
Owner CHONGQING UNIV OF TECH