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Alloy powder and method for welding galvanized steel sheet and az91d magnesium alloy based on laser synchronous powder feeding

A technology of laser synchronous powder feeding and galvanized steel sheet, applied in laser welding equipment, welding equipment, metal processing equipment and other directions, can solve the problems of easy deterioration of welded joint performance, difficult control of the melting degree of magnesium alloy, low melting point of magnesium alloy, etc. Achieve the effect of ideal engineering practical significance, flexible formula and high welding efficiency

Inactive Publication Date: 2016-01-06
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method is simple in process, due to the low melting point of magnesium alloy, it is difficult to control the melting degree of magnesium alloy during welding, and the performance of welded joints is easy to deteriorate.

Method used

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  • Alloy powder and method for welding galvanized steel sheet and az91d magnesium alloy based on laser synchronous powder feeding

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The clamping of the materials to be welded is as follows: figure 1 As shown, it is a composite process of laser welding + synchronous powder feeding. The AZD91 magnesium alloy 1 is a flat plate with a thickness of 3 mm, and the galvanized steel sheet 2 is a flat plate with a thickness of 3 mm. The high entropy alloy powder 200 mesh AlMg 0.1 After the CuZn medium is evenly mixed with a ball mill (600 rpm, ball milling for 30 minutes), it is sent to the overlapping area of ​​the workpiece to be welded by the powder feeder through the channel 4, and the welding seam 5 is formed under the irradiation of the laser beam 3 and the action of the inert gas 6 . Set the four main welding parameters as follows: laser power P=3kW, welding speed v=2m / min, powder feeding amount q=20g / min, lap gap 0.08mm.

Embodiment 2

[0019] The clamping of the materials to be welded is as follows: figure 1 As shown, it is a composite process of laser welding + synchronous powder feeding. The AZD91 magnesium alloy 1 is a flat plate with a thickness of 3 mm, and the galvanized steel plate 2 is a flat plate with a thickness of 3 mm. High entropy alloy powder 250 mesh AlMg 0.2 After the CuZn medium is evenly mixed with a ball mill (600 rpm, ball milling for 30 minutes), it is sent to the overlapping area of ​​the workpiece to be welded by the powder feeder through the channel 4, and the welding seam 5 is formed under the irradiation of the laser beam 3 and the action of the inert gas 6 . Set the four main welding parameters as follows: laser power P=4kW, welding speed v=2.5m / min, powder feeding amount q=25g / min, lap gap 0.09mm.

Embodiment 3

[0021] The clamping of the materials to be welded is as follows: figure 1 As shown, it is a composite process of laser welding + synchronous powder feeding. The AZD91 magnesium alloy 1 is a flat plate with a thickness of 3 mm, and the galvanized steel plate 2 is a flat plate with a thickness of 3 mm. High entropy alloy powder 300 mesh AlMg 0.3 After the CuZn medium is evenly mixed with a ball mill (600 rpm, ball milling for 30 minutes), it is sent to the overlapping area of ​​the workpiece to be welded by the powder feeder through the channel 4, and the welding seam 5 is formed under the irradiation of the laser beam 3 and the action of the inert gas 6 . The four main welding parameters are set as follows: laser power P=5kW, welding speed v=3m / min, powder feeding amount q=30g / min, lap gap 0.1mm.

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Abstract

The invention discloses an alloy powder and method for synchronously sending powder and welding a galvanized steel sheet and AZ91D magnesium alloy based on laser. A main component of the powder is AlMgxCuZn, wherein x is the mole ratio of Al and Mg, the ratio range is between 0 and 0.4, the size of the powder is 100 meshes to 300 meshes, and a process method which is matched with the alloy powder and method for synchronously sending the powder and welding the galvanized steel sheet and the AZ91D magnesium alloy based on the laser can improve wettability and compatibility between the galvanized steel sheet and AZ91D magnesium alloy. According to the alloy powder and method for synchronously sending the powder and welding the galvanized steel sheet and the AZ91D magnesium alloy based on the laser, the laser is taken as a welding hot source, under the protection of protective gas and the hot effect, a part of the surface of a material to be welded melts, through effective sending of the alloy powder, a stable weld pool is easily obtained, burning loss of alloying elements is reduced, the ratio of the alloying elements in a weld joint can be accurately controlled, a formula for filling the alloying powder is flexible, metallurgy action of weld metal can be remarkably improved, the weld joint without inclusions can be obtained especially aiming at the existence of Zn, a welding surface needs no special cleaning, welding efficiency is high, cost is low, the joint is reliable, and the alloy powder and method for synchronously sending the powder and welding the galvanized steel sheet and the AZ91D magnesium alloy based on the laser has relatively ideal engineering practical significance.

Description

technical field [0001] The invention relates to the field of welding dissimilar materials of galvanized steel sheets and magnesium alloys, in particular to an alloy powder and method for welding galvanized steel sheets and AZ91D magnesium alloys based on laser synchronous powder feeding. Background technique [0002] The specific gravity of magnesium is 1.74g / cm 3 , aluminum 2.7g / cm 3 , steel and iron 7.8g / cm 3 , plastic usually 0.83 ~ 2.2g / cm 3 . Magnesium is about one-third lighter than aluminum, and the use of magnesium alloys is conducive to lightweight vehicles, energy saving and emission reduction. The weight reduction of the car can improve its acceleration performance; the weight reduction of the top and the door can lower the center of gravity of the car and enhance stability; Magnesium alloys have higher specific strength and specific stiffness. The specific strength of magnesium alloys is higher than that of aluminum alloys and steels, and is comparable to en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/32
Inventor 张培磊马凯卢云龙闫华丁敏褚振涛
Owner SHANGHAI UNIV OF ENG SCI
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