Low cost carbon steel materials, after surface aluminum infiltration, possess wear resistance, corrosion resistance, and oxidation resistance characteristics. Has significant economic value. However, the welding difficulties of aluminum infiltrated steel hinder its widespread application. The base material of aluminum infiltrated steel is generally low carbon steel of 10 # and 20 #. After surface aluminum infiltration, there is a 0.1-0.3mm thick aluminum infiltration layer on the surface, with an Al content of 20% -40%. The hardness of the aluminum infiltration layer is close to martensitic steel, the corrosion resistance is comparable to 1Cr18Ni9Ti stainless steel, and the oxidation resistance is better than stainless steel. The problem of welding aluminum impregnated galvanized steel pipes mainly refers to how to restore the characteristics of the aluminum impregnated layer on the fusion line. 1. Before aluminum infiltration, the galvanized steel pipe is welded with stainless steel electrode A312 at its end, and then aluminum infiltration is carried out. In this way, during the butt welding of steel pipes, it becomes a welding between stainless steels without damaging the original aluminum infiltration layer. When the wall thickness of galvanized steel pipes is ≥ 12mm, it is advisable to use the overlay welding method. Operation method: Before welding, make a groove first. Make an initial groove on the inner and outer surfaces of the original pipe end, then weld with A312 welding rod, and finally form the final groove. Aluminum infiltration is applied to the steel pipe with the groove processed, and then the dirt and debris at the groove need to be ground off with sandpaper before welding. 2. When the wall thickness of galvanized steel pipes is less than 12mm, brazing should be used. When two steel pipes are welded together, the low melting point brazing material is melted using welding waste heat, and the melted brazing material adheres and penetrates into the inner and outer welds of the welded part. These brazing materials are corrosion-resistant and oxidation resistant materials, and their performance is better than that of aluminum infiltrated steel. The performance of the fusion line has the characteristics of brazing materials. The welding rod is A312. During welding, although the aluminum infiltration layer on the fusion line is damaged, there is brazing material sticking to this area. At the same time, during metal infiltration, the weld area is also covered with corrosion-resistant and wear-resistant oxides, demonstrating excellent performance.