The invention relates to methods for
welding austenitic
alloy steel and preparing a non-magnetic
drill collar by utilizing a linear
friction welding technology. The methods comprise the steps that workpieces made of the austenitic
alloy steel are clamped into a
friction welding machine, then the workpieces in clamps at the vibration end and the moving end are welded, when
welding is started, the workpiece at the moving end moves towards the workpiece at the vibration end, at the moment, the workpiece at the vibration end begins to vibrate, after the workpiece at the vibration end makes contactwith the workpiece at the moving end, friction
heat generation begins under action of the friction pressure, when the friction time reaches the set value, vibration stops,
upset forging begins to beconducted,
upset forging pressure is applied to the workpieces in the axial direction of the workpieces and maintained, after the
upset forging pressure is released, the workpieces are taken out, andthus the non-magnetic
drill collar is obtained. According to the methods for
welding the austenitic
alloy steel and preparing the non-magnetic
drill collar by utilizing the linear
friction welding technology, the mode that the non-magnetic drill collar is machined and repaired through the linear friction welding technology is proposed so as to solve the problems that as for an existing
machining method, materials are wasted, the cost is high and the production efficiency is low, and overcome the defect that the invalid drill collar is difficult to repair.