Method for welding foamed aluminium and aluminium alloy using solder capable of foaming

The invention discloses a welding method for welding foamed aluminium and aluminium alloy by using foaming solder, which belongs to the welding field of foamed metal. The steps are that 1. spherical pore foamed aluminium alloy blank is prepared as foaming welding solder by the melt foaming process; 2. the foamed aluminium and the aluminium alloy to be weld are selected and manufactured into the material with suitable size, then purified and dried; 3 a steel sealed mould is designed according to the outline dimension of the foamed aluminium and the aluminium alloy to be weld; 4. the solder with the thickness of 3 to 10mm is cut, as well as put and fixed in the solder together with the foamed aluminium and aluminium alloy joint into the sealed mould, and 0.5 to 4 Mpa of pressure is applied on both ends; 5. the solder in the foaming solder layer between the foamed aluminium and the aluminium alloy in the sealed mould is heated, and the second foaming procedure is started, the solder and base metal are infiltrate