Inertial friction welding method based on preheating by friction

Abstract

The invention belongs to the technical field of metal joining and particularly relates to an inertial friction welding method based on preheating by friction. The inertial friction welding method comprises the following steps: 1) firstly, fixing workpieces to be welded respectively through a rotary fixture and a mobile fixture, contacting the workpiece at a mobile end with the workpiece at a rotary end, applying a pre-tightening force to the workpieces, driving the rotary end to rotate, and preheating welding surfaces of the workpieces, wherein the pre-tightening force cannot be greater than afriction pressure in the inertial friction welding process; 2) after the rotation speed of the rotary end reaches a set rotation speed, increasing the applied pre-tightening force to the friction pressure, and disconnecting the connection between a spindle and a flywheel to allow the rotary end to continue rotating by the inertia of the rotary end; and 3) after the amounts of shortening, caused by friction, of the workpieces, reach a set value, or after the rotation speed drops to a set value due to friction, increasing the applied friction pressure to a upsetting force, maintaining the pressure, and ending the welding. The inertial friction welding method of the invention widens the parameter window of the inertial friction welding process, effectively utilizes the welding capability offriction welding, and further improves the industrial application value of the friction welding technology.

Description

technical field [0001] The invention relates to the technical field of material connection, in particular to a friction preheating inertial friction welding process, which is especially suitable for the connection between high-strength alloy materials sensitive to heat input and dissimilar materials. Background technique [0002] Axial friction welding is one of the main welding methods for connecting axisymmetric parts such as bars and pipes in the equipment manufacturing industry. Especially for high-alloy steels such as heat-resistant steels, non-ferrous metals such as aluminum alloys that are difficult to weld by traditional fusion welding methods, materials that are sensitive to heat input, axial friction welding can successfully achieve the same Efficient connection between solid and heterogeneous metals. Axial friction welding includes continuous drive friction welding and inertia friction welding. In continuous drive friction welding, due to the continuous rotation...

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Problems solved by technology

[0003] However, the existing inertial friction welding technology cannot fully meet the welding requirements of high-strength alloy materials that are sensitive to heat input and dissimilar metal materials with large differences in thermal properties.

For high-strength alloy materials with heat-sensitive input, the inertia friction welding time is short and the cooling rate of the welding area is fast, and brittle hardened phases are easily formed during the welding process, reducing the plasticity and toughness of the joint

When welding dissimilar metals with obvious differences in thermal physical properties, the metal material with high thermal conductivity will conduct a large amount of heat away from the friction interface, resulting in a low temperature of the friction interface and the inability to form a metallurgical bond, resulting in low joint strength

Using conventional inertial friction welding, increasing the heating time of friction welding not only increases the width of the heat-affected zone of the joint, deteriorates the mechanical properties of the joint, but also increases the consumption of the base metal and reduces the production efficiency

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