Cold metal transfer connection method of aluminum/steel dissimilar metal

A technology of cold metal transition and dissimilar metals, applied in metal processing equipment, welding media, welding equipment, etc., can solve the problem of ineffective control of welding heat input and the thickness of intermetallic compounds at the interface layer of aluminum and steel, and uneven and smooth weld formation , affecting the mechanical properties of joints and other issues, to achieve the effect of no macro defects, improved mechanical properties, and effective connection

Inactive Publication Date: 2012-06-20
LANZHOU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

The development of aluminum-steel welding technology is of great significance, but there are some shortcomings in aluminum-steel welding, such as uneven and smooth weld formation, macroscopic de

Method used

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  • Cold metal transfer connection method of aluminum/steel dissimilar metal
  • Cold metal transfer connection method of aluminum/steel dissimilar metal
  • Cold metal transfer connection method of aluminum/steel dissimilar metal

Examples

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Embodiment 1

[0020] Example 1: Offset by 1mm

[0021] In this implementation case, the upper metal plate is a deformed aluminum alloy AA6061 plate with a thickness of 1 mm, and the lower galvanized plate is a HDG60 plate with a thickness of 1 mm, both of which have a size of 100×200 mm. Before welding, the aluminum alloy plate is mechanically treated to remove the oxide film on the surface, and then the surface grease is removed with an organic solvent such as acetone. Finally, the above-mentioned cleaned aluminum alloy is subjected to alkali cleaning and pickling, and air-dried or low-temperature dried for use. Use organic solvents such as acetone to remove water stains and oil stains on galvanized steel sheets, and dry them in a dry environment for later use. The welding wire used in welding is ER4043 (AlSi 5 ).

[0022] like figure 1 and figure 2 As shown, the overlapping welding method is adopted, the aluminum alloy 1 is on top, the galvanized steel plate 2 is on the bottom, and t...

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Abstract

The invention provides a cold metal transfer connection method of aluminum/steel dissimilar metal. The cold metal transfer connection method comprises the following steps of: utilizing an aluminum alloy welding wire containing aluminum and silicon elements to weld; through carrying out cold metal transfer welding, forming a melt welding connection at one side of an aluminum plate through melting the aluminum alloy welding wire and an aluminum alloy parent metal in the welding process; and meanwhile, keeping a steel plate at a solid state and realizing a braze welding connection at one side of the steel plate, so as to form a melt-braze welding overlap joint.

Description

technical field [0001] The invention relates to a welding connection technology method of dissimilar metals. Background technique [0002] Due to the great difference in the crystal structure, physical and chemical properties between Fe-Al, the weldability of aluminum steel is very poor, which is mainly reflected in: (1) the welded joint is easy to oxidize; (2) the weld composition is uneven; (3) ) The welding deformation is large and it is easy to generate large welding stress; (4) The welded joint is prone to cracks. The most important thing is: during the welding process of steel and aluminum or aluminum alloy, various hard and brittle intermetallic compounds are easily formed, which increases the brittleness of the weld and reduces the plasticity and toughness of the weld. Based on the above welding characteristics, combined with the practicability of engineering applications and the current research status at home and abroad, at present, the connection of dissimilar me...

Claims

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Application Information

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IPC IPC(8): B23K1/00B23K1/19B23K1/20B23K35/28
Inventor 曹睿余刚陈剑虹
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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