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Inertial friction welding method based on preheating by friction

A technology of friction welding and process, applied in welding equipment, manufacturing tools, non-electric welding equipment, etc., can solve the problems of inability to form metallurgical bonding, inability to fully meet the thermal physical properties of high-strength alloy materials, welding of dissimilar metal materials, and low joint strength. It is beneficial to material flow and deformation, easy to fully automatic control, and optimizes the performance of joints

Active Publication Date: 2019-04-09
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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Examples

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Embodiment 1

[0039] Such as figure 1 , 2 , 3, using friction preheating inertial friction welding process to realize the connection of nickel-iron-based superalloy rods with a diameter of 10.5mm, including the following steps:

[0040] (1) HSMZ-4 axial friction welding machine is adopted, and the moment of inertia of the flywheel is 1.0kg m 2 , before starting welding, determine the pretightening force of 300MPa, the spindle speed of 1200rpm, the friction pressure of 300MPa, the friction shortening of 1mm, the upsetting pressure of 300MPa, and the holding time of 5s, and input the welding process parameters through the PC control interface 13;

[0041] (2) Welding starts: first, the hydraulic control system 12 adjusts the oil cylinder pressure to meet the parameter requirements, and the workpiece is clamped into the clamp of the friction welding machine, and a workpiece is clamped in each of the rotating end clamp 8 and the moving end clamp 7, and the workpiece, The rotating end and movi...

Embodiment 2

[0045] Such as figure 1 , 2 , 4, the inertial friction welding process of friction preheating is used to realize the connection of 37CrMoV alloy steel and 7075 aluminum alloy rods with a diameter of 10mm, including the following steps:

[0046] (1) HSMZ-4 axial friction welding machine is adopted, and the moment of inertia of the flywheel is 0.8kg m 2 , before the welding starts, determine the pretightening force of 20MPa, the spindle speed of 1600rpm, the friction pressure of 120MPa, the set value of the shortening amount of 1mm, the upsetting pressure of 120MPa, and the holding time of 15s, and input the welding control system 13 through the PC interface;

[0047] (2) Welding starts: first, the hydraulic control system 12 adjusts the oil cylinder pressure to meet the parameter requirements, and the workpiece is clamped into the clamp of the friction welding machine, and a workpiece is clamped in each of the rotating end clamp 8 and the moving end clamp 7, and the workpiece,...

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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...

Claims

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Application Information

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IPC IPC(8): B23K20/12B23K20/24B23K20/26
CPCB23K20/125B23K20/126B23K20/24B23K20/26
Inventor 秦国梁耿培皓王世路
Owner SHANDONG UNIV
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