Through experiments of welding thermo-simulation,welding crack sensitivity and tension on aluminum
alloys marked 2A14,2219,2195,2A97,1460, relationships between BRT and weldability,total content of main
elements in welding wire and weldability are established. Results show that the less BRT, the better weldability; when
6% of total cintent of main element is used in the welding wire,joint elagation will be eligible if the ability anticrack
is good. Rank of weldability is 2219,2A14,2195,2A97.