Abstract: In order to solve the problem of weld formation , a new process using non-reinforced insert was put forward for elct ron beam welding of SiC particle reinforced aluminum mat rix composites. The influence of non-reinforced insert on weld forming characteristics , the formation of brittle compound Al₄C₃ and porosity was investigated.The result s show that the non-reinforced insert can improve the weld formation quality obviously and suppress theformation of Al₄C₃ , but the porosity problem is still serious. On the basis of a discussion of the influence of processand composition on weld defect s and mechanical properties of welded joint s , several main technical point s wereobtained.