The search of transient liquid phase diffusion bonding on dissimilar metal materials of 20 steel and 0Cr18Ni9 was conducted in the open environment, using FeNiCrSi alloy as an interlayer and Argon gas as shielding gas. The results show that the amorphous of iron nickel alloy interlayer can make the welding both 20 steel and 0Cr18Ni9. Meanwhile, the connection strength and bending performance can meet the requirements. Furthermore, the effects of welding temperature and holding time on the interlayer and par...