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Active welding flux for tungsten inert gas (TIG) welding of aluminum and aluminum alloy and preparation method thereof

A technology of active flux and aluminum alloy, which is applied in welding equipment, metal processing equipment, welding medium, etc., can solve the problems of shallow penetration and low efficiency of TIG welding, and achieve improvement of crack and porosity problems, simple process, and reduced softening degree small effect

Active Publication Date: 2015-04-15
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention proposes an active flux for aluminum and aluminum alloy TIG and its preparation method, which overcomes the shortcomings of conventional TIG welding such as shallow penetration and low efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The active flux in this implementation case is used for the welding of pure aluminum. The components and contents (mass percentage) of the active flux are: AlN: 60%; TiO 2 : 15%; NaF: 10%; Cr 2 o 3 : 5%; MgO: 5%; Al 2 o 3 : 5%. First, weigh the analytical reagents of each single component according to the above formula ratio, mix them with a ball mill to obtain a mixture of the above components; the ball milling time is not less than 2 hours, and then sieve the mixture with a 100-300 mesh sieve. When the particle size reaches the requirement, put the mixture into an oven and heat it to 150°C to 200°C, and keep it warm for more than 2 hours to obtain active flux. Apply the prepared active flux evenly on both sides of the weld seam of the test piece to be welded, with a coating width of 4-6mm and a coating thickness of 0.2-0.3mm, and coat SiO on the outside 2 , AC TIG welding is used to complete one welding under the same welding process parameters. The welding defo...

Embodiment 2

[0017] The active flux in this implementation case is used for the welding of 5083 aluminum alloy. The components and contents (mass percentage) of the active flux are: AlN: 65%; TiO 2 : 10%; NaF: 10%; Cr 2 o 3 : 5%; MgO: 5%; Al 2 o 3 : 5%. First, weigh the analytical pure reagents of each single component according to the above formula ratio, mix them with a ball mill to obtain a mixture of the above components; the ball milling time is not less than 2 hours, and then sieve the mixture with a 100-mesh sieve to make the particle size When the requirements are met, put the mixture into an oven and heat it up to 150°C, and keep it warm for more than 2 hours to get the active flux. Apply the prepared active flux evenly on both sides of the weld seam of the test piece to be welded, with a coating width of 4-6mm and a coating thickness of 0.2-0.3mm, and coat SiO on the outside 2 , AC TIG welding is used to complete one welding under the same welding process parameters. The we...

Embodiment 3

[0019] The active flux in this implementation case is used for the welding of 5083 aluminum alloy. The components and contents (mass percentage) of the active flux are: AlN: 70%; TiO 2 : 10%; NaF: 10%; Cr 2 o 3 : 5%; MgO: 1%; Al 2 o 3 : 4%. First, weigh the analytical reagents of each single component according to the above formula ratio, mix them with a ball mill to obtain a mixture of the above components; the ball milling time is not less than 2 hours, and then sieve the mixture with a 300-mesh sieve to make the particle size When the requirements are met, put the mixture into an oven and heat it up to 200°C, and keep it warm for 3 hours to get the active flux. Apply the prepared active flux evenly on both sides of the weld seam of the test piece to be welded, with a coating width of 4-6mm and a coating thickness of 0.2-0.3mm, and coat SiO on the outside 2 , AC TIG welding is used to complete one welding under the same welding process parameters. The welding deformati...

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PUM

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Abstract

The invention discloses active welding flux for tungsten inert gas (TIG) welding of aluminum and aluminum alloy and a preparation method thereof. The active welding flux comprises following components by mass percentage: 50 percent to 80 percent of AlN, 25 percent to 15 percent of TiO, 1 percent to 10 percent of NaF1, 1 percent to 10 percent of Cr2O3, 1 percent to 5 percent of MgO, and the rest percent of Al2O3. The preparation method of the active welding flux comprises the steps that analytical reagents of all single components are weighed according to a formula proportion; and after being mixed, the analytical reagents are ball-milled by using a ball mill, evenly mixed, screened, filtered and then placed in an oven to be heated and thermally insulated, thereby obtaining the active welding flux. The active welding flux disclosed by the invention can increase the penetration when being used during aluminum alloy welding, and has the advantages that under the condition of same welding technological parameters, the surface of the aluminum alloy is well formed, the penetration is increased by 3 times, and 10 mm gapless butt joints can be through welded at once under the circumstance of no pre-heating and no chamfering, so that the welding technology is greatly simplified and the production efficiency is improved; and under the action of the active welding flux, the widths of welding seams are obviously reduced and welding deformation and the softening degree are reduced.

Description

technical field [0001] The invention relates to the field of welding materials, in particular to an active flux for aluminum and aluminum alloy TIG and a preparation method thereof. Background technique [0002] Aluminum and aluminum alloys have the advantages of low density, high specific strength and corrosion resistance, and are widely used in modern industrial production. Due to the large thermal conductivity and specific heat capacity of aluminum and aluminum alloys, the welding deformation is large, and energy-concentrated welding methods are usually used, among which TIG welding is the most common. When traditional TIG welding is used to weld aluminum alloy, because the weld depth of TIG welding is shallow during single-pass welding, generally not exceeding 3mm, for weldments exceeding this thickness, it is necessary to open a bevel, perform multi-layer filler wire welding, and even preheat Only then can welding be carried out. Therefore, when TIG welding is used ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/362B02C21/00
Inventor 邹家生严铿高莉华许祥平赵勇
Owner JIANGSU UNIV OF SCI & TECH