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Cladding agent capable of reducing heat affected zone of magnesium-rare earth alloy TIG welding joint and TIG welding method

A magnesium rare earth alloy and heat-affected zone technology, applied in welding equipment, welding accessories, arc welding equipment, etc., can solve the problems of reducing the mechanical properties of welded joints, achieve performance improvement, avoid heat-affected zones, and facilitate operation

Active Publication Date: 2021-02-12
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above-mentioned shortcomings of conventional TIG welding of magnesium rare earth alloys, the purpose of the present invention is to solve the problem that a wide heat-affected zone is likely to be generated in the process of welding magnesium rare earth alloys by conventional TIG welding, thereby reducing the mechanical properties of welded joints, and to provide a method for reducing the mechanical properties of welded joints. Cladding agent and TIG welding method for heat-affected zone of small magnesium rare earth alloy TIG welding joint

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  • Cladding agent capable of reducing heat affected zone of magnesium-rare earth alloy TIG welding joint and TIG welding method

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Effect test

Embodiment 1

[0029] Take the Mg-10Gd-3Y-0.5Zr (wt%) magnesium rare earth alloy casting as an example (wt% refers to the percentage that the components account for the total mass of the prepared magnesium alloy) to implement the present invention, and the preparation schematic diagram is as follows figure 1 shown.

[0030] The mass percent range of the cladding agent used is: 15% silicon dioxide (SiO 2 ), 80% titanium carbide (TiC), 5% potassium fluorozirconate (K 2 ZrF 6 ), the raw material powder particle size is 200 orders.

[0031] Described magnesium rare earth alloy TIG welding method is as follows:

[0032] 1) After the screened raw materials are configured according to the above ratio, put them into a ball mill and fully grind them into a powder, then add acetone to the mixture according to the mass ratio of the mixture to the solvent at 1:1 and stir evenly to prepare a paste Cladding agent solution.

[0033] 2) Apply the cladding agent solution prepared in step 1) on the surfa...

Embodiment 2

[0037] The present invention is implemented by taking Mg-4Y-2Nd-1Gd-0.5Zr (wt%) magnesium rare earth alloy casting as an example (wt% refers to the percentage of components in the total mass of the prepared magnesium alloy).

[0038] The mass percent range of the cladding agent used is: 20% silicon dioxide (SiO 2 ), 75% titanium carbide (TiC), 5% potassium fluorozirconate (K 2 ZrF 6 ), the raw material powder particle diameter is 250 orders.

[0039] Described magnesium rare earth alloy TIG welding method is as follows:

[0040] 1) Prepare the screened raw materials according to the above proportions, put them into a ball mill, grind them thoroughly and mix them into a powder, then add acetone to the mixture according to the mass ratio of the mixture to the solvent at 1.2:1 and stir evenly to prepare a paste Cladding agent solution.

[0041] 2) Apply the cladding agent solution prepared in step 1) on the surface of the V-shaped groove of the magnesium rare earth alloy, and...

Embodiment 3

[0045] The present invention is implemented by taking Mg-5Y-2.5Nd-1Gd-0.5Zr (wt%) magnesium rare earth alloy casting as an example (wt% refers to the percentage of components in the total mass of the prepared magnesium alloy).

[0046] The mass percentage range of the cladding agent used is: 25% silicon dioxide (SiO 2 ), 72% titanium carbide (TiC), 3% potassium fluorozirconate (K 2 ZrF 6 ), the raw material powder particle size is 300 orders.

[0047] Described magnesium rare earth alloy TIG welding method is as follows:

[0048] 1) Prepare the screened raw materials according to the above proportions, put them into a ball mill and grind them thoroughly to form a powder, then add acetone to the mixture according to the mass ratio of the mixture to the solvent at 1.3:1 and stir evenly to prepare a paste Cladding agent solution.

[0049] 2) Apply the cladding agent solution prepared in step 1) on the surface of the V-shaped groove of the magnesium rare earth alloy, and the c...

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Abstract

The invention discloses a cladding agent capable of reducing a heat affected zone of a magnesium-rare earth alloy TIG welding joint and a TIG welding method. The cladding agent comprises the followingcomponents in percentage by mass: 15-37% of silicon dioxide, 60-80% of titanium carbide and 3-8% of potassium fluozirconate. Before TIG welding, the groove surface of base metal is coated with a layer of cladding agent, and after preheating treatment, the cladding agent on the groove surface is molten through small-current welding to form a uniform cladding layer; and then conventional TIG welding is adopted for completing connection, and the magnesium-rare earth alloy welding joint with the small heat affected zone can be obtained. The width of the heat affected zone of the magnesium-rare earth alloy TIG welding joint can be remarkably reduced, and the mechanical property of the magnesium-rare earth alloy TIG welding joint is effectively improved.

Description

technical field [0001] The invention belongs to the field of welding technology, and relates to a cladding agent and a TIG welding method for reducing the heat-affected zone of a magnesium-rare-earth alloy TIG welding joint. Specifically, it relates to a TIG welding method in which the cladding layer formed by the cladding agent can reduce the width of the heat-affected zone of the magnesium-rare-earth alloy TIG welding joint on the basis of ensuring that the necessary welding heat input remains unchanged. Background technique [0002] With the increasing demand for lightweight in important equipment fields, magnesium rare earth alloys have shown broad application prospects due to their low density, high specific strength and rigidity, good electromagnetic shielding, and excellent corrosion resistance and heat resistance. , has a unique attraction in the fields of aerospace, transportation, national defense and military industry. The application scenarios of magnesium rare ...

Claims

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Application Information

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IPC IPC(8): B23K9/167B23K9/32
CPCB23K9/167B23K9/32
Inventor 童鑫吴国华张国庆张亮丁文江
Owner SHANGHAI JIAO TONG UNIV