“In-situ” weld-alloying/laser beam weldingis utilized to join SiCp/6061Al MMC with titanium as alloying element. Microstructure ofthe weld is characterized as functions of alloying content and laser processingparameters. Results show that the needle-like harmful phase Al4C3 iscompletely eliminated and a novel composite reinforced by TiC and Ti5Si3is produced in the weld of SiCp/6061Al MMC by “in-situ” weld-alloying/laser beam welding with titanium as the alloyingelement. “In-situ” weld-alloying/laser beam weldingis a new promising method for joining of SiCp/6061Al MMCs.