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A gnawing-assisted arc melting-brazing method for dissimilar metals

A brazing method and technology of dissimilar metals, applied in metal processing equipment, welding equipment, manufacturing tools, etc., can solve problems such as the inability to solve the differences in the linear expansion coefficients of dissimilar metals, the inability to achieve mechanical engagement, and the inability to apply to ordinary structural parts, etc. , to achieve the effect of enhancing the mechanical interlocking effect of the interface, avoiding welding seam inclusions, and avoiding chemical residues

Active Publication Date: 2021-07-23
CHONGQING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is that this method needs to be shot peened before welding, which undoubtedly increases the complexity of the equipment; in terms of welding large or long plates, the effect of ultrasonic waves is weakened, and it is only applicable to local areas. In addition, ultrasonic assisted welding does not The interface of the steel matrix is ​​greatly bent, and the mechanical interlocking effect cannot be achieved
However, this method cannot solve the differences in the linear expansion coefficients of dissimilar metals, and there are still many defects
At the same time, this welding method cannot be applied to ordinary structural parts, and the joint shear strength is low, which greatly limits the application range of this method

Method used

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  • A gnawing-assisted arc melting-brazing method for dissimilar metals
  • A gnawing-assisted arc melting-brazing method for dissimilar metals
  • A gnawing-assisted arc melting-brazing method for dissimilar metals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1, a gnawing-assisted dissimilar metal arc melting-brazing method, which includes the following steps.

[0036] Step one, see image 3 , the selected mixing head 3 includes a handle 31 and a nibbling part 32 connected with the handle 31, the nibbling part is provided with four steps from the 32 end to the direction of the handle, and the diameter of the plurality of steps is far away from the handle. 31 direction decreases, the unilateral taper of the nibbling portion 32 is 14°, the overall length of the nibbling portion 32 is 6mm, the tip diameter of the nibbling portion 32 is 2mm, and the root diameter of the nibbling portion 32 is 4mm. A bevel is processed on the surface to be welded of the steel plate 4, and the angle of the bevel is the same as the taper of the nibbling part 32. An avoidance bevel 51 is processed on the surface to be welded of the aluminum alloy plate 5, and then the steel plate is removed by mechanical grinding 4 and the oxide film on ...

Embodiment 2

[0042] Embodiment 2, a gnawing-assisted dissimilar metal arc melting-brazing method, which includes the following steps.

[0043] Step 1, the selected mixing head includes a shank and a nibbling part connected to the shank, the nibbling part is provided with four steps from the end to the direction of the shank, and the diameter of the multiple steps decreases from the direction away from the shank , the unilateral taper of the nibbling part is 14°, the overall length of the nibbling part is 6.8 mm, the diameter of the tip of the nibbling part is 2 mm, and the root diameter of the nibbling part is 4 mm. A groove is processed on the surface to be welded of the steel plate, and the angle of the groove is the same as the taper of the nibbling part, and an avoidance groove is processed on the surface to be welded of the aluminum alloy plate, and then the steel plate and the aluminum alloy plate are removed by mechanical grinding surface oxide film, and clean the surface of the ste...

Embodiment 3

[0048] Embodiment 3, a gnawing-assisted dissimilar metal arc melting-brazing method, which includes the following steps.

[0049] Step 1, the selected mixing head includes a shank and a nibbling part connected to the shank, the nibbling part is provided with four steps from the end to the direction of the shank, and the diameter of the multiple steps decreases from the direction away from the shank , the unilateral taper of the nibbling part is 14°, the overall length of the nibbling part is 5.5 mm, the diameter of the tip of the nibbling part is 2 mm, and the root diameter of the nibbling part is 4 mm. A groove is processed on the surface to be welded of the steel plate, and the angle of the groove is the same as the taper of the nibbling part, and an avoidance groove is processed on the surface to be welded of the aluminum alloy plate, and then the steel plate and the aluminum alloy plate are removed by mechanical grinding surface oxide film, and clean the surface of the ste...

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Abstract

The invention discloses a dissimilar metal arc melting-brazing method based on gnawing assistance, which includes the following steps: step 1, fixing two dissimilar metal base materials to be welded on a welding platform, and assembling them into a butt joint; step 2 , adjust the relative position between the stirring head, the arc welding torch and the welding wire; Step 3, the wire feeding speed of the welding wire is 680-1500mm / min, the welding current of the arc welding torch is 70-110A, the arc length is 2-5mm, the stirring head speed The welding speed is 1300~5400r / min, the welding speed is 44~150mm / min, argon is used as the shielding gas, and the shielding gas flow rate is 8~20L / min; step 4, the welding platform drives the base metal to be welded, and the stirring head moves towards the assembly The gap is fed vertically, and the stirring head cuts the base metal to be welded to produce debris, which is dispersed and distributed in the molten pool under the rotation of the stirring head; step 5, when the welding is over, raise the stirring head, delay Turn off the protective gas and cool in air. It can improve the mechanical properties and welding efficiency of welded joints, and reduce the difference in linear expansion coefficient of welded joints.

Description

technical field [0001] The invention relates to welding of dissimilar metals, in particular to a gnawing-assisted arc melting-brazing method of dissimilar metals. Background technique [0002] With the rapid development of modern technologies such as aerospace, automotive equipment manufacturing, and navigation industry, in order to alleviate the economic pressure on people's lives caused by energy shortages, reduce production and living costs, and optimize production capacity structures, the requirements for welded structural parts are getting higher and higher. standard. Aluminum-steel composite structure has comprehensive advantages in light weight, high strength, corrosion resistance, etc., and has been widely valued, and its application range is becoming wider and wider. In the future manufacturing industry, lightweight is the key to energy saving and emission reduction of vehicles. One of the important means. In the design of aluminum / steel composite structures that ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K28/02
CPCB23K28/02
Inventor 许惠斌丛伟钟万亮
Owner CHONGQING UNIV OF TECH
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