Study on X-ray nondestructive testing of SOFC metal brazing

In order to solve the sealing problems of tube plate type (plate type) solid oxide fuel cell(SOFC), 95AgCu solder was used to seal single cell and interconnector by air brazing. The difference between 95AgCu solder and powder was analyzed by X-ray nondestructive testing and the welding quality was evaluated through life test of single cells. Results show that the use of X-ray nondestructive test can not only optimize the welding process, but also form high-quality and imporous weld utilizing a forming welding piece. Measured open circuit voltage and single cell power within 120 h at 750 ℃ show that brazing materials and the process are suitable for sealing the SOFC stack.