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Cold metal transition fusion welding-soldering connection method for magnesium steel dissimilar metal

A technology of cold metal transition and dissimilar metals, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of incompatibility of magnesium and steel, great differences in physical and mechanical properties, and difficulty in achieving mutual solubility, etc., to achieve effective connection , Improve the effect of mechanical properties

Inactive Publication Date: 2011-09-14
LANZHOU UNIVERSITY OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The physical and chemical properties of magnesium alloy and steel are very different: (1) melting point, magnesium is 650 ℃, steel is 1539 ℃, it is difficult to achieve mutual solubility between the two
(2) Lattice type, magnesium is close-packed hexagonal, steel is cubic, so the physical properties and mechanical properties are very different
Therefore, from the perspective of welding theory and technology, the current fusion welding method is difficult to achieve effective connection of magnesium steel.
Dalian University of Technology used laser-arc hybrid welding technology for welding research, and obtained joints, but because magnesium and steel do not dissolve or react, the joint connection method is mechanical connection, and the mechanical properties cannot meet the needs of practical applications (Journal of Welding Science, 2006, Vol, 27, Issue.12: 53-57)

Method used

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  • Cold metal transition fusion welding-soldering connection method for magnesium steel dissimilar metal
  • Cold metal transition fusion welding-soldering connection method for magnesium steel dissimilar metal
  • Cold metal transition fusion welding-soldering connection method for magnesium steel dissimilar metal

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Effect test

Embodiment 1

[0027] When the distance between the welding wire feeding position and the overlap gap of magnesium alloy steel is 1mm, the dissimilar metals of magnesium steel are connected by CMT welding method, as follows: (1) Materials used: magnesium alloy plate is deformed magnesium alloy is AZ31B , the thickness is 1mm, the steel plate is HDG60 steel, the thickness of the plate after galvanizing treatment is 1mm, and the thickness of the galvanized layer is 8.6μm. (2) Welding sample size: Cut the magnesium alloy plate and galvanized steel plate into a test plate with a size of 200mm×50mm. (3) Pre-welding treatment: Wipe the galvanized steel plate with acetone before welding, brush off the oxide film on the surface of the magnesium alloy plate with a wire brush, and then wipe it clean with acetone. (4) Welding method: the magnesium alloy plate and the galvanized steel plate are welded according to the following figure 1 The lap joint shown in the figure is 10mm in width, forming a lap ...

Embodiment 2

[0029] When the welding wire feed position deviates from the magnesium-steel lap gap by 4mm, the dissimilar metals of the magnesium-steel are connected by the CMT welding method. The materials and welding methods used are the same as those of the above examples, except that the welding torch deviation position is changed from the original 1mm is moved to 4mm, and the welding parameters selected for the welding test have also changed. The selected welding parameters are: welding voltage is 17V, welding speed is 8.5m / s, and wire feeding speed is 5m / min. The shape of the weld formed by welding after deviation of 4mm is as follows Figure 7 and Figure 8 As shown, it can be seen from the figure that the reinforcement of the weld is 3mm, and the wetting angle between the weld metal and the galvanized steel plate reaches 45 degrees. For the formed welded joints, the tensile specimens are also obtained according to the common sampling method, and the specimens are also fractured in ...

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Abstract

The invention discloses a cold metal transition fusion welding-soldering connection method for magnesium steel dissimilar metal. The method comprises the following steps of: (1) performing galvanization treatment on a common low-carbon steel plate or a low-alloy steel plate; (2) wiping the steel plate by using acetone, brushing an oxidation film on the surface of a magnesium alloy plate by using a steel wire brush, and cleanly wiping by using the acetone; (3) overlapping the magnesium alloy plate with a galvanized steel plate to form an overlap joint at which the magnesium alloy plate is positioned on the upper side and the galvanized steel plate is positioned on the lower side, wherein the overlapping width is 10 mm; and (4) performing deviation overlapping on one side of the magnesium alloy plate by using a welding gun during welding, welding by using a cold metal transition welding machine, melting the magnesium alloy plate during welding, keeping the galvanized steel plate in a solid state, performing soldering connection on one side of the galvanized steel plate and performing melting connection on one side of the magnesium alloy plate, wherein a gap distance (L) is 1 to 4 mm, the welding speed is 7.2 to 8.5 mm / s, the welding wire feed speed is 4 to 5 m / min, and the welding voltage is 10 to 17 V.

Description

technical field [0001] The invention relates to the welding of magnesium plates and steel plates, and the international patent classification is B23K. Background technique [0002] At present, the research reports on the weldability, welding process and welding materials of dissimilar metals of magnesium steel mainly focus on laser-TIG composite heat source welding, friction stir welding, laser welding, diffusion welding and brazing. [0003] The physical and chemical properties of magnesium alloy and steel are very different: (1) melting point, magnesium is 650 ℃, steel is 1539 ℃, it is difficult to achieve mutual solubility between the two. (2) Lattice type, magnesium is close-packed hexagonal, steel is cubic, so the physical properties and mechanical properties are very different. (3) From the phase diagram, there is almost no physical and chemical reaction between magnesium and steel, that is, no intermetallic compound or solid solution can be formed. Therefore, from t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K31/02
Inventor 曹睿余建永陈剑虹王培忠(美国)朱亮石玗
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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