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Additional alternating magnetic field assisted aluminum alloy/steel dissimilar metal melt-brazing method and system

An alternating magnetic field and dissimilar metal technology, applied in metal processing equipment, welding equipment, arc welding equipment, etc., can solve the problems of easy fluctuation of arc energy output, restriction of mechanical properties of joints, poor spreading wettability, etc., to achieve increased brazing Interface area, low cost, effect of reducing wetting angle

Pending Publication Date: 2021-06-18
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the MIG arc melting and brazing process also has a prominent technical bottleneck that is difficult to precisely control the heat input, which leads to fluctuations in the arc energy output, resulting in the joint Fe-Al intermetallic compound layer being locally too thick or too thin (not brazed), and at the same time Poor spreading and wettability of liquid metal aluminum on the steel surface makes the brazing joint surface smaller and the tensile strength is low, which seriously restricts the mechanical properties of the joint and limits the improvement of welding quality

Method used

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  • Additional alternating magnetic field assisted aluminum alloy/steel dissimilar metal melt-brazing method and system
  • Additional alternating magnetic field assisted aluminum alloy/steel dissimilar metal melt-brazing method and system
  • Additional alternating magnetic field assisted aluminum alloy/steel dissimilar metal melt-brazing method and system

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Experimental program
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Effect test

Embodiment 1

[0043] Aiming at the problems of low joint strength and easy generation of pores during aluminum / steel MIG brazing welding, the invention provides an aluminum / steel MIG brazing welding system assisted by an external alternating magnetic field. figure 1 It is the aluminum / steel MIG brazing system diagram assisted by an external alternating magnetic field of the present invention, including a magnetic generating device 4, a MIG welding machine 1, a dual-circuit excitation power supply 6, and the MIG welding machine 1 is connected to a shielding gas device 2, wherein the shielding gas The gas is pure argon or helium. The magnetic generating device 4 cooperates with the welding torch 3 of the MIG welding machine 1 . The two-way excitation power supply 6 is connected to the coil of the magnetic generator 4 .

[0044] In one embodiment, as figure 2 As shown, the magnetic generating device 4 includes a U-shaped iron core 9 and two coils wound on the iron core 9, which are respecti...

Embodiment 2

[0049] Step 1. Fix the aluminum alloy plate and steel plate to be welded, wherein the steel plate is on the bottom and the aluminum alloy plate is on top, such as figure 1 shown.

[0050] Step 2: Turn on the excitation power supply and set the excitation parameters. The excitation current waveforms of the two coils are as follows image 3 As shown, the peak value of the excitation current is 2-30A, the base value current is 0, and the pulse frequency is 1-40Hz.

[0051] Step 3. According to the plate thickness and welding speed requirements of the workpiece to be welded, select the appropriate welding process parameters and start welding.

[0052] The aluminum alloy of the welding workpiece is 1mm thick 5052 aluminum alloy plate and 2mm thick low carbon steel galvanized steel plate. Adjust the MIG welding power supply, the welding current is 71A, the wire feeding speed is 3.3m / min, the welding wire is ER4043 wire with a diameter of 1.2mm, the welding speed is 0.6m / min, the ...

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Abstract

The invention relates to an additional alternating magnetic field assisted aluminum alloy / steel dissimilar metal melt-brazing method and system. According to the method, in the MIG melt-brazing process, an alternating magnetic field is applied in the direction parallel to welding, and the alternating magnetic field interacts with welding current. The alternating magnetic field is applied in the direction, parallel to welding, of the MIG melt-brazing, that is, the direction of the magnetic field is parallel to the welding direction. The alternating magnetic field interacts with the welding current to generate additional alternating electromagnetic force, so that periodic transverse swinging of electric arcs and molten drops is realized. The thickness of an intermetallic compound layer is controlled, and the wettability and spreadability of molten aluminum on the steel surface are improved. The welding quality is improved.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to an aluminum alloy / steel dissimilar metal melting and brazing method and system assisted by an external alternating magnetic field. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Energy saving, emission reduction and environmental protection are the development direction of the current automobile industry, and they are also major issues related to the sustainable development of human beings. The lightweight design and manufacture of automobile body is the key way to meet energy saving and emission reduction. Part of the steel is replaced by aluminum alloy, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/173B23K9/08B23K9/133
CPCB23K9/08B23K9/133B23K9/173
Inventor 王林陈姬武传松
Owner SHANDONG UNIV
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