Cold metal transition melting-brazing welding connection method for dissimilar magnesium metal and aluminum metal

Abstract

Disclosed is a cold metal transition melting-brazing welding connection method for dissimilar magnesium metal and aluminum metal. Cold metal transition welding is adopted, argon is adopted as protecting gas, transition metal is a galvanized steel sheet, two types of welding wires are adopted, an aluminum-silicon welding wire is adopted on the aluminum side, and a magnalium zinc welding wire is adopted on the magnesium side. A welding gun is utilized to align to an aluminum edge and a magnesium edge, high-melting-point transition metal is clamped between magnesium and aluminum to stop mutual contact of liquid magnesium and liquid aluminum, so that melting-brazing welding connections between a magnesium melting welding joint and the transition metal (the galvanized steel sheet) as well as between an aluminum melting welding joint and the transition metal (the galvanized steel sheet) are realized, and connection of dissimilar metal between an aluminum alloy sheet and a magnesium alloy sheet is realized finally.

Description

technical field [0001] The invention relates to a welding connection technology method of dissimilar metals. Background technique [0002] The melting points of magnesium and aluminum are relatively similar, and brittle magnesium-aluminum intermetallic compounds are easily produced during the welding process of magnesium and aluminum, and this compound has extremely high hardness and poor ductility, which greatly reduces the performance of the joint, and the joint is easy to oxidize. These shortcomings are serious Affected the connection between magnesium and aluminum. At present, the main focus is to achieve a certain strength connection through brazing, diffusion welding, friction stir welding, and other solid-phase connections, but the bonding strength is still very poor, far from meeting the requirements of the industrial field. [0003] When the general fusion welding method is used, the above shortcomings have caused difficulties in the connection between the two, esp...

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Problems solved by technology

[0002] The melting points of magnesium and aluminum are relatively similar, and brittle magnesium-aluminum intermetallic compounds are easily produced during the welding process of magnesium and aluminum, and this compound has extremely high hardness and poor ductility, which greatly reduces the performance of the joint, and the joint is easy to oxidize. These shortcomings are serious Affected the connection between magnesium and aluminum

At present, the main focus is to achieve a certain strength connection through brazing, diffusion welding, friction stir welding, and other solid-phase connections, but the bonding strength is still very poor, far from meeting the requirements of the industrial field.

[0003] When the general fusion welding method is used, the above shortcomings have caused difficulties in the connection between the two, especially in the transition area where a large number of intermetallic compounds (Al 3 Mg 2 , Mg 17 Al 12 ), seriously reducing the mechanical properties of the joint

If other welding methods are used, such as pressure welding and brazing, the thickness of the brittle layer is reduced, but the shape of the joint is limited, and the efficiency is greatly reduced, with little improvement in the bonding performance

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