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Welding method of aluminum alloy plate

A welding method and technology for aluminum alloy plates, applied in welding equipment, welding/welding/cutting items, metal processing, etc., can solve problems such as affecting the mechanical properties of the welding area, eliminate the heat-engine affected area, increase the effective welding area, The effect of improving the strength of the weld

Inactive Publication Date: 2018-11-16
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its existing Thermo Mechanical Affected Zone (TMAZ) and Heat Affected Zone (Heat Affected Zone, HAZ) often become weak areas
However, double-sided friction stir welding can effectively eliminate the heat-engine-affected zone and heat-affected zone, but it will increase the number of coarse-sized precipitates in the stirred zone on the upper surface due to the influence of heat input from the lower surface, which greatly affects the mechanical properties of the welded area.

Method used

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  • Welding method of aluminum alloy plate
  • Welding method of aluminum alloy plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The specifications of 7075 aluminum alloy extruded plate are: length × width × thickness = 170mm × 90mm × 8mm. The edge joints of the two extruded plates to be welded are pre-processed into an inclined joint section 30, and the inclined angle is 30° from the horizontal plane. After cleaning and polishing, they are docked and fixed on the clamping device. Use a special mixing head to make blind holes on the welding surface. The diameter of the blind holes is 2mm, the depth is 4mm, and the interval is 4mm. The ball-milled uniform Al, Sc, Zr mixed powder is filled and compacted and then sealed. The upper and lower surfaces 10, 20 are the same operation. The mixed powder ratio is Al-0.2Sc-0.1Zr (mass ratio). The model SXT-10 gantry mobile friction stir welding machine is used for double-sided friction stir welding. The specifications and process parameters of the stirring needle are as follows: the length of the stirring needle: 5mm, the pressing amount of the shoulder: 1mm...

Embodiment 2

[0031] The specifications of 7075 aluminum alloy extruded plate are: length × width × thickness = 170mm × 90mm × 8mm. After the surfaces of the two extruded plates to be welded are cleaned and polished, they are docked and fixed on the clamping device. Use a special stirring head to make blind holes on the welding surface. The diameter of the blind holes is 2mm, the depth is 4mm, and the interval is 4mm. The ball-milled uniform Al, Sc, Zr mixed powder is filled and compacted, and the groove is sealed. The mixed powder ratio is Al-0.2Sc- 0.1Zr (mass ratio). The model SXT-10 gantry mobile friction stir welding machine is used for single-sided friction stir welding. The specifications and process parameters of the stirring pin are as follows: the length of the stirring pin: 5mm, the pressing amount of the shoulder: 1mm, the inclination angle of the stirring head: 2° , Welding speed: 90mm / min, rotation speed: 1200r / min. Place stamping liquid nitrogen cooling step by step behind ...

Embodiment 3

[0033] The specifications of 7075 aluminum alloy extruded plate are: length × width × thickness = 170mm × 90mm × 8mm. The edge joints of the two extruded plates to be welded are pre-processed into an inclined joint section 30, and the inclined angle is 30° from the horizontal plane. After cleaning and polishing, they are docked and fixed on the clamping device. Use a special stirring head to make blind holes on the welding surface. The diameter of the blind holes is 2mm, the depth is 4mm, and the interval is 4mm. The ball-milled uniform Al, Sc, Zr mixed powder is filled and compacted, and the groove is sealed. The mixed powder ratio is Al-0.2Sc- 0.1Zr (mass ratio). Use the model SXT-10 gantry mobile friction stir welding machine for single-sided friction stir welding. After the first group of parallel overlapping welding is completed, move the stirring head out of the plate and control the stirring head back to the initial welding position of the first group. , and move a sho...

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Abstract

The invention relates to a welding method of an aluminum alloy plate, comprising the following steps: processing edge interfaces of to-be-welded plates into inclined interface sections, cleaning and polishing, butting the inclined interface sections and fixing the butted inclined interface sections on a clamping device; drilling blind holes in the welding zone on the surface of the aluminum plate;mixing Al powder, Sc powder and Zr powder by ball milling to obtain mixed powder; and evenly filling the blind holes in the upper surface of the plate with a half of the mixed powder, sealing a filling area by stirring with a short stirring needle, filling and sealing the lower surface by the same operation, performing multi-pass parallel stacking welding by adopting the double-sided friction stir welding, and performing cooling while welding is carried out. The effective welding area is increased by the inclined interface; the double-sided friction stir welding not only eliminates the thermo-mechanically affected zone and the heat affected zone, but also increases the weldable thickness of the to-be-welded plate, improves the strength of the weld seam and eliminates the gap defect at theback of the weld seam when combined with the inclined joint. Coarse precipitated phases in the upper surface stirring zone increased by heat input from the lower surface stirring are reduced by synchronously performed cooling and welding.

Description

technical field [0001] The invention relates to the field of welding, in particular to an aluminum alloy plate welding method. Background technique [0002] Aluminum and its alloys have the advantages of low density, high plasticity, high specific strength, excellent electrical conductivity, thermal conductivity and corrosion resistance, which determine their important position and development in industry. It is not only widely used in military industry, agriculture, light industry, heavy industry, and transportation, but also widely used in building structural materials, sporting goods and household daily necessities. In engineering practice, the welding of aluminum alloy is indispensable. If the traditional melting welding technology is used, it will inevitably lead to serious softening of the welded joint, low welding strength, thermal cracks and pores near the weld, and welding deformation. [0003] Friction Stir Welding (FSW) is a solid-state connection method proposed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12B23K101/18B23K103/10
CPCB23K20/1245
Inventor 秦永强胡叶明黄俊陈顺华王岩崔接武周士昂张勇吴玉程
Owner HEFEI UNIV OF TECH
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