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Aluminum/steel special metal low-power laser coupling DP-MIG welding-brazing method

A DP-MIG, dissimilar metal technology, applied in the field of low-power laser coupling DP-MIG welding and brazing of aluminum/steel dissimilar metals, can solve the problem of high heat input of high-power laser-arc hybrid welding, and it is difficult to effectively control the intermetallic The thickness of the compound layer, the poor wettability and spreadability of the joint, etc., can reduce the welding heat input, improve the applicability and reliability, and achieve the effect of grain refinement.

Inactive Publication Date: 2019-05-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, laser-arc melting and brazing is mainly based on the coupling of high-power laser (above 4kW) and electric arc (MIG / MAG, TIG), but there are many problems in the welding process. On the one hand, due to the high reflectivity of aluminum alloy to laser , resulting in a very low utilization rate of laser energy and serious energy loss, and the porosity of the aluminum alloy side fusion welding joint is still maintained at a high level. At the same time, the heat input of high-power laser-arc hybrid welding is high and unstable, which promotes The growth of the metal compound layer makes it difficult to effectively control the thickness of the intermetallic compound layer; on the other hand, the wettability and spreadability of the joint are closely related to the mechanical properties of the joint, and the high-power laser plasma reacts violently with the arc plasma, causing the joint to wet Poor resistance and spreadability, resulting in a significant decrease in mechanical properties

Method used

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  • Aluminum/steel special metal low-power laser coupling DP-MIG welding-brazing method
  • Aluminum/steel special metal low-power laser coupling DP-MIG welding-brazing method

Examples

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Embodiment 1

[0037] The low-power laser coupling DP-MIG arc is used to weld aluminum alloy and steel. The base metal is 5052 aluminum alloy and ultra-high-strength thermoforming steel 22MnB5. The thickness of the aluminum alloy is 1.5mm, and the thickness of the thermoforming steel 22MnB5 is 1.3mm. The joint form is a butt joint.

[0038] Before welding, use sandpaper to grind the surface of aluminum alloy and thermoformed steel to remove surface impurities, oil stains and oxide layers, clean them with alcohol, and then fix them with clamps.

[0039]The laser and the DP-MIG arc adopt paraxial coupling. During the welding process, the laser is in front and the arc is in the back. The distance between the base metal intersection point and the laser action point on the base metal) is 0.5mm, the offset b is 0.6mm, the angle α between the arc welding torch and the welding base metal is 45°, and the average current of the high-energy pulse group is 120A. The average current of the low-energy pu...

Embodiment 2

[0041] The low-power laser coupling DP-MIG arc is used to weld aluminum alloy and steel. The base metal is 5052 aluminum alloy and ultra-high-strength thermoforming steel 22MnB5. The thickness of the aluminum alloy is 2.2mm, and the thickness of the thermoforming steel 22MnB5 is 1.8mm. The joint form is a butt joint.

[0042] Before welding, use sandpaper to grind the surface of aluminum alloy and thermoformed steel to remove surface impurities, oil stains and oxide layers, clean them with alcohol, and then fix them with clamps.

[0043] The laser and the DP-MIG arc adopt paraxial coupling. During the welding process, the laser is in front and the arc is in the back. The distance between the base metal intersection point and the laser action point on the base metal) is 2mm, the offset b is 1mm, the angle α between the arc welding torch and the welding base metal is 60°, the average current of the high-energy pulse group is 250A, and the low-energy The pulse group average curr...

Embodiment 3

[0045] The low-power laser coupling DP-MIG arc is used to weld aluminum alloy and steel. The base metal is 5052 aluminum alloy and TWIP980 high-strength steel. The thickness of aluminum alloy is 2mm, and the thickness of TWIP 980 is 1.5mm. The welding joint is lap joint. connector.

[0046] Before welding, use sandpaper to grind the surface of aluminum alloy and thermoformed steel to remove surface impurities, oil stains and oxide layers, clean them with alcohol, and then fix them with clamps.

[0047] The laser and DP-MIG arc adopt paraxial coupling. During the welding process, the laser is in front and the arc is in the back. The distance between the base metal intersection point and the laser action point on the base metal) is 0.3mm, the offset b is 1mm, the angle α between the arc welding torch and the welding base metal is 45°, the average current of the high-energy pulse group is 140A, and the low The average current of energy pulse group is 50A, the frequency of low en...

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Abstract

The invention provides an aluminum / steel special metal low-power laser coupling DP-MIG welding-brazing method. The aluminum / steel special metal low-power laser coupling DP-MIG welding-brazing method comprises the following steps of polishing, washing and fixing an aluminium alloy and a steel material; and welding the fixed aluminium alloy and the fixed steel material, wherein the welding process comprises the steps of firstly, setting a compounding mode and a welding position; secondly, setting a laser incident angle and a laser parameter; thirdly, setting an electric arc welding gun angle andan electric arc parameter; fourthly, determining shielding gas and a welding wire; and fifthly, welding the aluminium alloy and the steel material at a welding speed of 0.1-1 m / min. According to thealuminum / steel special metal low-power laser coupling DP-MIG welding-brazing method, by using direct current double-pulse metal inert-gas welding, grain refinement and dendrite fragmentation are realized through periodical high energy pulse and low energy pulse alternative variation, and therefore, the pore generation rate and crack sensitivity are reduced; DP-MIG arc is also guided and stabilizedby using low power laser to be beneficial for inhibiting the growth of intermetallic compound layer; and therefore, the wettability and spreadability of a joint are improved so that the strength of the joint is enhanced.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a low-power laser coupling DP-MIG welding method for aluminum / steel dissimilar metals. Background technique [0002] As two very important basic structural materials in modern manufacturing industry, aluminum alloy and steel play an irreplaceable role in high-end manufacturing fields such as aerospace, automobile industry, rail transit, ship and marine equipment, and national defense industry. Aluminum-steel dissimilar metal connection technology has always been a research hotspot and technical difficulty in the field of welding. Realizing high-quality and efficient connection of aluminum-steel dissimilar metals and forming a high-performance aluminum-steel composite structure is helpful for meeting special production needs, simplifying equipment design, reducing product costs, Realizing structural optimization has important engineering significance and practical value. However...

Claims

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Application Information

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IPC IPC(8): B23K1/005B23K1/19B23K1/00B23K103/20
Inventor 段吉安曹小兵周雄锋仲顺顺于凯旋孙翔
Owner CENT SOUTH UNIV
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