The paper describes some characteristics of aluminium alloys such as: hydrogen sensitivity, evaporation of high volatile elements, porosity of spike areas and solidification cracking which influence weldability and vacuum tightness of welds. Electron beam welding of AlCu4MgSi and AlMgSi alloys using filler shim enriched with Si is described. The special methods of electron beam braze welding for joining of FeNiCo alloy and stainless steel with AlCu4MgSi and AlMgSi alloys arę also presented. The general conclusion is that Al and Fe-alloys for UHV equipment can be successfully welded.
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