Adhesive jointing and electric arc spot welding combined connection method for metals

A connection method and metal-to-metal technology, applied in the field of material engineering, can solve problems such as difficult to achieve effects, affect mechanical properties, and large failure loads, and achieve the effects of meeting actual engineering needs, improving material utilization, and increasing fatigue strength

Inactive Publication Date: 2011-05-18
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the development and application of new materials, it is inevitable to connect dissimilar metals with different properties and performances. However, for difficult-to-weld materials, it is difficult to achieve good connections using traditional techniques, such as fusion welding between magnesium and aluminum. Secondly, The mechanical properties of joints are difficult to meet the requirements of practical applications, which limits the practical application of materials
[0003] Arc welding is a welding method widely used in industry, but for welding between dissimilar metals, it is difficult to achieve good results because it is easy to produce intermetallic compounds
As a connection technology, adhesive bonding has the advantages of good fatigue performance and large failure load. It is widely used in overlapping structural parts in aerospace, transportation and other fields, but it has

Method used

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  • Adhesive jointing and electric arc spot welding combined connection method for metals
  • Adhesive jointing and electric arc spot welding combined connection method for metals
  • Adhesive jointing and electric arc spot welding combined connection method for metals

Examples

Experimental program
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Effect test

Example Embodiment

[0016] Example 1. Welding magnesium / aluminum dissimilar metals by the method of the present invention.

[0017] The size of the overlapping part of the plate is 15×300mm, and the thickness of the plate is 1.5mm. The welding steps are as follows:

[0018] 1. Clean the sample with acetone before welding to remove oil stains on the surface, and clean the lap surface to remove the oxide film after drying.

[0019] 2. Such as figure 1 , figure 2 As shown, the glue layer 4 is coated between the overlapping parts 6 of the materials 1 and 5 to be welded, the overlapping width W is 15 mm, the total thickness of the glue layer is 0.1 mm, and the glue layer adopts an epoxy resin structural adhesive.

[0020] 3. Use a welding fixture to press the plates 1 and 5 tightly, and open a row of through holes 2 with a diameter of 3mm along the seam direction at the lap joint. The distance between each through hole is D=25mm.

[0021] 4. Adopt the molten extremely inert gas shielded welding process to per...

Example Embodiment

[0024] In Example 2, the magnesium alloy was welded by the method of the present invention.

[0025] The size of the overlapping part of the plate is 20×300mm, and the thickness of the plate is 1.5mm. The welding steps are as follows;

[0026] 1. The pre-welding treatment is the same as in Example 1.

[0027] 2. The lapped surface of the material to be welded is coated with a glue layer, the lap width is 20mm, the total thickness of the glue layer is 0.15mm, and the phenolic resin structural adhesive is used.

[0028] 3. Use a welding fixture to press the overlapped part tightly, and open a row of through holes with a diameter of 4mm along the seam at the overlapped place, and the distance between each through hole is 45mm.

[0029] 4. Using tungsten gas shielded welding process, single-sided wire-filled spot welding is performed on the through hole, and then the test piece is turned over to perform wire-filled spot welding on the other side of the through hole. The welding process par...

Example Embodiment

[0032] In Example 3, Q235 steel was welded by the method of the present invention.

[0033] The size of the overlapping part of the plate is 35×300mm, and the thickness of the plate is 2.0mm. The welding steps are as follows:

[0034] 1. The pre-welding treatment is the same as in Example 1.

[0035] 2. The lapped surface of the material to be welded is coated with an adhesive layer, the lap width is 35mm, the total thickness of the adhesive layer is 0.5mm, and the urea-formaldehyde resin structural adhesive is used.

[0036] 3. Use a welding fixture to press the overlapped part tightly, and open a row of through holes with a diameter of 6mm along the seam at the overlapped place, and the distance between each through hole is 50mm.

[0037] 4. Using plasma arc welding process, single-sided wire-filled spot welding is performed on the through hole, and then the test piece is turned over to perform wire-filled spot welding on the other side of the through hole. Arc current is 180A, dista...

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Abstract

The invention belongs to the technical field of material engineering and relates to a connection technique for metals, in particular to a welding and adhesive jointing combined connection technique for metals, which comprises: applying adhesive for structural curing on the joint surfaces of materials to be welded; jointing the materials; and welding. The technique is characterized in that: an adhesive layer which is 0.02 to 1 millimeter thick is uniformly applied between the jointing surfaces of the materials to be connected; after joining, through holes with an aperture of 3 to 10 millimeters are formed on a jointed part at 15 to 50 millimeter intervals along a joint, and performing double-sided filler wire spot welding at the holed part with an arc weld; and heating the jointed parts between which a glue layer is applied to 50 to 500 DEG C before welding and after welding, and keeping the temperature for 10 to 180 minutes. The method can increase the strengths of the welded spots, avoid surface collapse caused by other adhesive bonding, improve the bearing load, fatigue strength and shearing performance of difficult-to-weld welded structure made of one kind of metal and different kinds of metals, and meet actual engineering needs.

Description

Technical field [0001] The invention belongs to the field of material engineering technology, and relates to the connection technology between metals, in particular the connection technology of welding and bonding between metals. Background technique [0002] The wide application of new materials is inseparable from advanced connection technology for technical support and guarantee. Due to the development and application of new materials, it is inevitable to connect dissimilar metals with different properties and properties. However, for difficult-to-weld materials, it is difficult to achieve good connections using traditional processes, such as fusion welding between magnesium and aluminum. The mechanical properties of the joint are difficult to meet the requirements of practical applications, which limits the practical application of materials. [0003] Arc welding is a widely used welding method in industry, but for welding between dissimilar metals, it is difficult to achieve ...

Claims

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Application Information

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IPC IPC(8): B23K31/00B23K9/007
Inventor 刘黎明张兆栋宋刚任大鑫
Owner DALIAN UNIV OF TECH
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