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.