The research was to study of mechanical properties on the weldment of low carbon steel by Friction Welding. The design of experiments by friction welding carbon steel AISI 1040 diameter 10 mm, length 100 mm. The certain friction time (Tf) are 3 4 5 6 7 8 9 and 10 Seconds, friction pressure (Pf), are 20 25 30 35 15 40 45 and 50 MPa. Studied of mechanical properties and metallurgy. The results indicated that an obvious the certain friction time (Tf) equal 5 seconds, tensile strengths equal 668.33 MPa. The friction pressure (Pf), equal 30 MPa, tensile strengths equal 668.33 MPa. The certain friction time (Tf) are 3 4 5 6 7 8 9 and 10 Seconds the average impact resistance equal 42.625 J/cm2, friction pressure (Pf) are 20 25 30 35 15 40 45 and 50 MPa the average impact resistance equal 38.875 J/cm2.