Alloy powder and method for synchronously sending powder and welding galvanized steel sheet and AZ91D magnesium alloy based on laser

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...

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