Abstract: This paper introduces that using the chloridebase salt bath as a heating method can titanize the surface of the dia-mond and weld the 20N 14Mo steel with the diamond together. The colomony was used as the interim layer met-
al between the diamond and the steel in the test. It was found that the diamond neither become graphite nor be weakened on its properties in the salt bath. In the process of realizing the contact welding of the diamond and the steel, Ti and Ni interact to form the lower fusion coexist crystal so as to largely lower the welding temperature.This opened up a valid way to the welding technology of the diamonjd tools. The salt bath welding is lower cost,
easer to operate and it can significantly increase the strength of the joint.

Key words: Diamond, Welding, Salt bath welding