Linear friction welding process between aluminium part and steel part

The linear friction welding process between aluminum part and steel part includes the following steps: fixing the steel part in a vibrating fixture; vibrating the steel part vertically by means of a vibrating source and a link rod and at 24-30 Hz frequency and 2.0-2.8 mm amplitude; fixing the aluminum part in a movable fixture; contacting the steel part and the aluminum part mutually with a pushing oil cylinder in the friction pressure of 3.5-5.5 Kg/sq mm for 1.5-2.0 sec; stopping vibration and applying forging pressure of 6.5-12.0 Kg/sq mm for 0.5-1 sec; and cooling naturally to form firm joint between the aluminum part and the steel part. The present invention controls the temperature in friction area at 0.8 time the smelting point of aluminum and applying forging pressure to produce plastic deformation so as to weld by means of re-crystallization and the atomic combination between aluminum and steel.