Welding base plate and application of welding base plate to magnesium/aluminum dissimilar metal welding

A technology for welding backing plates and dissimilar metals, applied in the direction of welding/welding/cutting items, welding equipment, metal processing equipment, etc., to achieve the effects of reducing welding difficulty, improving mechanical strength, and reducing production time

Active Publication Date: 2017-02-22
NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current application of light metal engineering, aluminum alloy still occupies a dominant position. It has the advantages of high specific strength, good ducti

Method used

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  • Welding base plate and application of welding base plate to magnesium/aluminum dissimilar metal welding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Automatic argon arc butt welding of rolled plates of AZ31 magnesium alloy and 6061 aluminum alloy on self-made fixtures:

[0033] (1) Both AZ31 magnesium alloy and 6061 aluminum alloy rolled plates have a thickness of 2mm and a size of 50×110mm. Before welding, use a steel brush to remove the surface oxide layer, and use acetone to remove surface grease and dirt;

[0034] (2) Place the plate to be welded on the red copper lower backing plate, the welding fusion zone falls above the U-shaped groove, and then place the red copper upper backing plate symmetrically on both sides above it. The interior of the upper and lower backing plates of copper is pre-filled with an appropriate amount of liquid nitrogen before welding. The red copper backing plate is 15mm away from the welding fusion zone, and then clamped and fixed, so that the plates to be welded can be evenly stressed and deformation can be suppressed (such as figure 1 shown);

[0035] (3) if figure 1 As shown, bu...

Embodiment 2

[0038] Automatic argon arc butt welding of AZ31 magnesium alloy and 5052 aluminum alloy rolled plates on self-made fixtures:

[0039] (1) AZ31 magnesium alloy and 5052 aluminum alloy rolled plates have a thickness of 3mm and a size of 70×120mm. Before welding, the surface is removed with a steel brush to remove the surface oxide layer, and the surface grease and dirt are removed with acetone.

[0040] (2) Place the plate to be welded on the red copper lower backing plate, the welding fusion zone falls above the U-shaped groove, and then place the red copper upper backing plate symmetrically on both sides above it. The interior of the upper and lower backing plates of copper is pre-filled with an appropriate amount of liquid nitrogen before welding. The copper upper backing plate is 10mm away from the welding fusion zone, and then clamped and fixed, so that the plates to be welded can be evenly stressed and deformation can be suppressed (such as figure 1 shown);

[0041] (3) ...

Embodiment 3

[0044] Automatic argon arc butt welding of AZ80 magnesium alloy extruded plate and 6061 aluminum alloy rolled plate on self-made fixture:

[0045] (1) AZ80 magnesium alloy and 6061 aluminum alloy rolled plates have a thickness of 3.5mm and a size of 50×180mm. Before welding, steel brushes are used to remove the surface oxide layer, and acetone is used to remove surface grease and dirt.

[0046] (2) Place the plate to be welded on the red copper lower backing plate, the welding fusion zone falls above the U-shaped groove, and then place the red copper upper backing plate symmetrically on both sides above it. The interior of the upper and lower backing plates of copper is pre-filled with an appropriate amount of liquid nitrogen before welding. The copper upper backing plate is 10mm away from the welding fusion zone, and then clamped and fixed, so that the plates to be welded can be evenly stressed and deformation can be suppressed (such as figure 1 shown);

[0047] (3) if fig...

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Abstract

The invention discloses a welding base plate and application of the welding base plate to magnesium/aluminum dissimilar metal welding. According to the welding base plate, a to-be-welded plate is clamped and fixed by adopting the hollow welding base plate which is filled with a cooling agent. Generation time of a hard brittle intermetallic compound Mg17Al12 is effectively shortened; mechanical strength of a dissimilar welding connector is improved; thermal deformation of the plate during a welding process is effectively avoided; and thermal residual stress of welding is reduced. Meanwhile, during the welding process, a proper air flow is adopted for a welding area at the lower surface of the to-be-welded plate; argon is blown for protection; and the phenomenon that molten metal is in contact with air for reaction during the welding process, so that welding joint inclusions are generated can be avoided. According to the welding base plate, through double effects of thermal control during the welding process and post-welding thermal treatment, the amount of the hard brittle intermetallic compound Mg17Al12 and the welding residual stress are greatly reduced; and welding quality of the welding connector is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of magnesium / aluminum alloy dissimilar welding, and in particular relates to a welding backing plate and its application in magnesium / aluminum dissimilar metal welding. Background technique [0002] Energy shortage and environmental pollution are prominent problems in today's world. Lightening one's own weight has become an effective way to reduce environmental pollution and save energy in the fields of automobiles and aerospace. According to statistics, for every 100 kg reduction in vehicle quality, fuel consumption can be reduced by 0.7 liters. In aerospace vehicles, the reduction in the weight of structural parts leads to a reduction in fuel costs, which is 100 times that of the automotive industry. Therefore, light-weight and high-strength metal materials represented by magnesium alloys and aluminum alloys have received widespread attention. Developed countries such as North America, Europe and Japan h...

Claims

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Application Information

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IPC IPC(8): B23K9/035B23K9/16B23K9/235B23K103/18
CPCB23K9/035B23K9/16B23K9/235B23K2103/18
Inventor 刘洪涛周吉学杨院生唐守秋
Owner NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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