The characteristics of friction-welded joint between commercially pure-titanium (CP-Ti) and low carbon steel, of which was subjected to post-weld heat-treatment (PWHT), was investigated. When the joint was made with friction speed of 25 s−1, friction pressure of 200 MPa, friction time of 2.5 s and forge pressure of 250 MPa, it had the same tensile strength as that of the CP-Ti base metal. The joint had no intermediate layer consisting of intermetallic compound (IMC interlayer) at the weld interface. The joint efficiency of the joint subjected to PWHT decreased with increasing heating temperature and its holding time, and the joint fractured at the weld interface although it had no IMC interlayer. The void was generated on the weld interface of the joint during PWHT process.
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