Effect of Ti filler on microstructure and properties of joint during TIG welding for aluminum matrix composite

In this paper, TIG welding is used to join aluminum matrix composite and the influence of Ti filler on the comprehensive properties of weld is discussed. Results show that Ti filler acts on the properties of weld in two aspects mainly. On one side, Ti filler can improve fluidity of the molten pool and reduce hole and incomplete fusion obviously. On the other side, Ti acts with reinforcement particles SiC first in high temperature and accordingly the production of harmful phase Al_4C_3is restrained and TiC particles produced in the reacting act as reinforcement. Simultaneously, the content of filler affects the microstructure and properties of weld. In this paper, the relationship of thickness of filler and the resultant in the weld is investigated and the properties of joint are optimized.