Abstract: To improve the tensile strength and anti-corruption performance of the sheet-metal connections and choose the appropriate welding method，salt spray and tensile tests are performed to three kinds of materials (St12 steel，5A05 alloy and 2A12 alloy) with two welding methods ( spot welding with permeating glue and permeating glue with spot welding) and the traditional spot welding in this paper．The result shows that for St12 steel，the tensile strength of welded sheet metal by the traditional spot welding is largest，and the anti-corruption performance of welded sheet metal by permeating glue with spot welding is the best．For 5A05 alloy and 2A12 alloy，both the tensile strength and the anti-corruption performance of welded sheet metal by permeating glue with spot welding are the best．Therefore，permeating glue with spot welding is a proper connecting method of the sheet-metal．