Stirring head for welding metal and thermoplastic polymer and welding method

A thermoplastic polymer and welding method technology, applied in welding equipment, metal processing equipment, non-electric welding equipment, etc., can solve the problems of large influence of joint forming, many internal defects of joints, difficult joint forming, etc., and reduce the longitudinal residual tensile stress. The effect of peaks, improved material migration morphology, and improved surface forming quality

Active Publication Date: 2021-06-25
SHENYANG AEROSPACE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the friction stir welding technology, the problems of poor weld formation quality, many internal defects in the joint, and low mechanical properties caused by the welding of metals and thermoplastic polymer materials have not been effectively solved.
[0004]In particular, in the process of Friction Stir Lap Welding (FSLW), which relies on material migration at the lap interface to form an effective connection, the cone The flow-promoting stirring head represented by the shape needle drives the surrounding materials to make axial and radial three-dimensional flow, resulting in overflow of thermoplastic polymer material and poor forming quality of weld surface
However, the window of process parameters in the connection of metal and thermoplastic polymer materials is narrow, and the speed of the stirring head has a direct impact on heat input and material flow, and has a greater impact on joint formation
Excessively high speed can easily cause excessive heat input, resulting in the following problems: due to the poor compatibility of the two materials and the large difference in melting point, the viscoelastic polymer material overflows the

Method used

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  • Stirring head for welding metal and thermoplastic polymer and welding method
  • Stirring head for welding metal and thermoplastic polymer and welding method
  • Stirring head for welding metal and thermoplastic polymer and welding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The parameters and specific steps of the friction stir lap welding in this embodiment are:

[0059] Step 1. Clean up before welding, use an organic solvent or cleaning agent to wipe the plate to be welded to remove surface impurities, the plate to be welded is a 2.0mm thick 7075-T6 aluminum alloy plate (size 200×150mm) Short glass fiber reinforced PEEK sheet (size 200×150mm);

[0060] Step 2. Use fixtures to clamp the plates to be welded, adopt the configuration principle of 7075-T6 alloy plate as the upper plate, and short glass fiber reinforced PEEK plate as the lower plate;

[0061] Step 3. Put the auxiliary heating strip on the upper plate, connect the auxiliary heating strip and the temperature control equipment, and complete the heating preparation work;

[0062] Step 4. According to the properties of the upper plate, select a stirring head with parameters such as the diameter of the stirring needle, the diameter of the shaft shoulder, and the concave angle that ...

Embodiment 2

[0067] The parameters and specific steps of the friction stir lap welding in this embodiment are:

[0068] The specific steps are:

[0069] Step 1. Clean up before welding, use an organic solvent or cleaning agent to wipe the plate to be welded to remove surface impurities, and the plate to be welded is a 3.0mm thick AZ31 magnesium alloy plate (size 200×150mm) and a 3.0mm thick Nylon6A polymer Plate (size 200×150mm);

[0070] Step 2. Use the tooling fixture to be welded, and use the AZ31 magnesium alloy plate as the upper plate, and the Nylon6A polymer plate as the lower plate configuration principle;

[0071] Step 3. Put the auxiliary heating strip on the upper plate, connect the auxiliary heating strip and the temperature control equipment, and complete the heating preparation work;

[0072] Step 4. According to the properties of the upper plate, select a stirring head with parameters such as the diameter of the stirring needle, the diameter of the shaft shoulder, and the ...

Embodiment 3

[0077] The parameters and specific steps of the friction stir lap welding in this embodiment are:

[0078] Step 1. Clean up before welding, use an organic solvent or cleaning agent to wipe off the surface impurities on the plate to be welded, the plate to be welded is 2.0mm thick 1060 aluminum alloy plate (size 220×150mm) and 4.0mm thick ABS polymer Plate (size 220×150mm);

[0079] Step 2. Use the fixture to be welded, and use the aluminum alloy plate as the upper plate, and the ABS polymer plate as the lower plate;

[0080] Step 3. Put the auxiliary heating strip on the upper plate, connect the auxiliary heating strip and the temperature control equipment, and complete the heating preparation work;

[0081] Step 4. According to the properties of the upper plate, select a stirring head with parameters such as the diameter of the stirring needle, the diameter of the shaft shoulder, and the concave angle that meet the process requirements. There is a needle on the last round ta...

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Abstract

The invention provides a stirring head for welding metal and a thermoplastic polymer and a welding method, and belongs to the field of new material connection. The stirring head is characterized by a concave shaft shoulder and an inverted-tower-shaped stirring needle with a multi-stage flow blocking circular truncated cone structure of the stirring head. The welding method is characterized in that friction stir lap welding is completed by heating the two sides of the upper surface of a welding seam through a resistance type auxiliary heating strip, and an auxiliary heat source can provide the effects of preheating before welding and slow cooling after welding for a welded plate. According to the stirring head for welding the metal and the thermoplastic polymer and the welding method, the flow choking appearance design of the stirring head can inhibit the overflow of a thermoplastic polymer material and improve the surface quality of the welding seam; and the welding auxiliary heating process for the metal and the thermoplastic polymer material is based on the thoughts of isothermal peak rotation speed reduction and stress reduction anti-pulling-off, the rotation speed of the stirring head is reduced under the condition that the same welding temperature is guaranteed, and therefore joint surface forming is improved, internal defects are eliminated, the interface structure is optimized, and the quality of a heterogeneous joint is comprehensively improved.

Description

technical field [0001] The invention belongs to the technical field of friction stir welding, and relates to a stirring head for welding metal and thermoplastic polymer and a welding method. Background technique [0002] Thermoplastic polymer materials have high specific strength, high specific modulus and excellent corrosion resistance, so they have broad application prospects in aerospace, wind power, transportation and other fields. In some industrial manufacturing fields, the wide application of thermoplastic polymer materials inevitably leads to connection problems with traditional metal materials such as steel, aluminum, and magnesium alloys. At present, most of the connections between thermoplastic polymer materials and metals are adhesive bonding and mechanical connections (riveting and bolting), but problems such as joint aging or stress concentration are unavoidable. [0003] Friction Stir Welding (FSW) is a new type of solid-phase joining technology, which uses a...

Claims

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Application Information

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IPC IPC(8): B23K20/12B23K20/22B23K20/26
CPCB23K20/122B23K20/129B23K20/26B23K20/22
Inventor 姬书得郭芮秀胡为李鸣申马琳龚鹏熊需海宋崎张芷晴
Owner SHENYANG AEROSPACE UNIVERSITY
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