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Welding method for light alloy thick plate

A welding method and technology for light alloys, applied in the field of light alloy welding, can solve the problems of not being able to improve the temperature field distribution of magnesium alloy thick plates, increasing energy consumption and resistance material costs, increasing tooling manufacturing processes and costs, etc. The effect of saving welding time, efficient welding and improving work efficiency

Inactive Publication Date: 2018-01-23
广东柳泰焊接科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, for light alloy thick plates, if a method similar to thin plate welding is used, it is often difficult to obtain high-quality welded joints
[0005] In order to improve the friction stir welding effect of light alloy thick plates, the patent (publication number CN101885109) proposes a 10-20mm thick AZ31 magnesium alloy friction stir welding method, the stirring needle is a conical helical shape; in fact, the invention provides The welding method is similar to the friction stir welding method of magnesium alloys with a thickness of less than 10mm, and the conical spiral stirring needle cannot improve the temperature field distribution of the magnesium alloy thick plate during the friction stir welding process.
The patent (publication number CN102689090) proposes a friction stir welding method for 4~50mm thick magnesium and aluminum alloy medium and thick plates. Controllable heat source for heating; this not only increases tooling manufacturing process and cost, but also increases energy consumption and resistance material cost
The patent (publication number CN101885109) proposes a thick plate aluminum alloy preheating friction stir welding method with preheating before welding and heat treatment after welding. This method also has the problems of increasing energy consumption and complicated procedures

Method used

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  • Welding method for light alloy thick plate
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  • Welding method for light alloy thick plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: First, rigidly fix the base metal of the rolled AZ31 magnesium alloy thick plate to be welded on the backing plate, and the size of the base metal is 300mm×100mm×10mm (length×width×height); Drill a hole at the beginning, the diameter of the hole is φ8mm, and the depth of the hole is 6mm; then insert the stirring head into the thick magnesium alloy plate to be welded, the stirring head is made of 4Cr5MoSiV steel, the diameter of the shaft shoulder is 18mm, the length of the stirring needle is 9.6mm, The diameter of the large end of the needle is 10mm, and the diameter of the small end of the stirring needle is 6mm. A relatively higher rotation speed of 3000r / min and a relatively slower travel speed of 100mm / min are used for the first length, and a relatively lower rotation speed of 1400r / min and a relatively faster travel speed of 600mm / min are used for the remaining length. The welding process The downward pressure of the central shaft shoulder remains unchan...

Embodiment 2

[0020] Example 2: First, rigidly fix the parent metal of the rolled AZ31 magnesium alloy thick plate to be welded on the backing plate. The size of the parent material is 300mm×100mm×35mm (length×width×height); Drill a hole at the beginning, the diameter of the hole is φ30mm, and the depth of the hole is 20mm; then insert the stirring head into the thick plate of magnesium alloy to be welded, the stirring head is made of 4Cr5MoSiV steel, the shaft shoulder diameter is 40mm, the length of the stirring needle is 34.2mm The diameter of the large end of the needle is 25mm, and the diameter of the small end of the stirring needle is 18mm. A relatively higher rotation speed of 1500r / min and a relatively slower travel speed of 30mm / min are used for the first length, and a relatively lower rotation speed of 800r / min and a relatively faster travel speed of 110mm / min are used for the remaining length. The welding process The pressing amount of the central shaft shoulder remains unchange...

Embodiment 3

[0021] Example 3: First, rigidly fix the parent metal of the 6061-T6 aluminum alloy plate to be welded on the backing plate, the size of the parent material is 300mm×100mm×10mm (length×width×height); Drill the hole, the diameter of the hole is φ8mm, and the depth of the hole is 6mm; then insert the stirring head into the base metal to be welded, the stirring head is made of 4Cr5MoSiV steel, the shaft shoulder diameter is 18mm, the length of the stirring needle is 9.6mm, and the large end of the stirring needle The diameter is 10mm, and the diameter of the small end of the stirring needle is 6mm. The relatively higher rotation speed of 2500r / min, the relatively slower travel speed of 80mm / min, the relatively lower rotation speed of 1200r / min, the relatively faster travel speed of 300mm / min in the remaining length, the shoulder of the welding process The amount of pressure remains unchanged at 0.2mm; after the stirring head reaches the end of the weld, continue to rotate and sta...

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Abstract

The invention provides a welding method for a light alloy thick plate. Compared with an existing light alloy thick plate friction-stir welding method, the welding method has the following beneficial effects that on one hand, heat in the light alloy thick plate can be promoted to be more uniform and more sufficient in the friction-stir welding process, and therefore high-quality and efficient welding of the light alloy thick plate is achieved; on the second hand, processes such as preheating before welding and heat treatment after welding do not need to be added, the technological processes aresimplified, the welding time is saved, and the work efficiency is improved; and on the third hand, a welding tool does not need to be specially improved, a common welding tool is used, resistance materials do not need to be purchased either, and the cost is reduced.

Description

technical field [0001] The invention relates to the field of light alloy welding, in particular to a welding method for light alloy thick plates. Background technique [0002] Density less than 3.5g / cm 3 High-quality aluminum alloys and magnesium alloys are what we usually call light alloys. In the process of rapid progress in the lightweight process, light alloys have huge market application potential. Welding is a common joining method used in commercial applications of light alloys. [0003] Friction stir welding is a method of solid phase welding of light alloys such as magnesium and aluminum. In the process of friction stir welding, a stirring head is used to insert the part to be welded of the workpiece, through the friction stirring between the stirring head and the workpiece, the friction heat makes the metal in this part in a thermoplastic state and under the pressure of the stirring head from its front to the rear Plastic flow, so that the parts to be welded ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12B23K20/24
Inventor 唐远金徐安莲杜彦斌罗素琴李力
Owner 广东柳泰焊接科技有限公司
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