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Physical simulation method for plastic deformation of friction welding joint

A technology of physical simulation and plastic deformation, applied in flow characteristics, measuring devices, instruments, etc., can solve the problems of large research errors, and it is difficult to reveal the flow behavior of plastic metal in friction welding joints, so as to achieve convenient operation, easy observation, and saving cost effect

Inactive Publication Date: 2009-12-09
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

However, the above-mentioned friction welding is a complex process of interaction between the formation and development of the temperature field, the evolution of the stress-strain field, and the formation and flow of plastic metal under the strong thermal-mechanical coupling.
This makes it difficult to reveal the plastic metal flow behavior of the above-mentioned friction welded joints by using traditional test methods and numerical simulation research, and the research error is relatively large, and satisfactory results cannot be obtained for the plastic metal flow behavior in the friction welding process.
At present, there is no report related to the physical simulation experiment research of friction welding

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  • Physical simulation method for plastic deformation of friction welding joint
  • Physical simulation method for plastic deformation of friction welding joint
  • Physical simulation method for plastic deformation of friction welding joint

Examples

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Embodiment 1

[0036] This example studies the deformation behavior of linear friction welding joints. Firstly, aluminum alloy is selected as the research object, and stainless steel is sampled as the dual sample. The characteristic size of the aluminum alloy is a rectangular section of 10mm×17mm, and the sample length is 50mm; due to the large deformation of the aluminum alloy, the characteristic size of the stainless steel is 35mm×60mm, and the sample length is also 50mm. A linear friction welding machine is used for welding, the vibration frequency is 20Hz, the amplitude is 3mm, the axial pressure is 30MPa, the friction time is 10s, and no upsetting force is applied. At the same time, a thermometer was used to measure the temperature of the central interface (refer to figure 2 ), record the axial displacement of the sample. After welding, the aluminum alloy is cooled to room temperature by water cooling. The research object obtained during the whole process is poorly combined with the ...

Embodiment 2

[0038] The 20# steel bar with a diameter of 20mm is used as the research object. For the convenience of clamping, the length is 150mm; the TZM molybdenum alloy rod with a diameter of 30mm is used as the dual sample, and the length is 150mm for the convenience of clamping. The continuous drive friction welding machine was used for the test, the rotating fixture clamped 20# steel, and the moving fixture clamped the molybdenum alloy (see attached image 3 a); Friction test process parameters: friction pressure 10kN, rotation speed 1200rpm, friction time 3s, 5s and 7s, photos during the friction process are shown in the attachment image 3 b. After welding, the two workpieces were tapped separately, and the research object was air-cooled. After welding, the dual sample did not deform, and the research object had obvious burrs, and the burrs were well formed ( Figure 4 ). Measure the macroscopic quantity of joint plastic deformation ( Figure 5 ), both the axial shortening and...

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Abstract

The invention relates to a physical simulation method for plastic deformation of a friction welding joint, which is characterized by comprising the following steps: according to the symmetrical characteristic of the plastic deformation of the friction welding joint, adopting one sample to perform relative rotating or reciprocating linear motion, wherein the sample is a research object, and the plastic deformation happens in the experimental process; adopting the other sample as a couple part which has higher high-temperature strength, basically generates no plastic deformation in the experimental process, and only performs relative shift under the action of axial pressure to cling to the deformed sample; performing a welding experiment under certain welding process parameters, wherein the two samples have poor combination and can be separated by light bump after welding; and finally, only searching the deformed sample to save the cost, for the convenience of observation and analysis and the like. The method has the following advantages: only half of the research objects are adopted so that the cost is saved and the observation is convenient; and the prior welding equipment is adopted, and the operation is convenient and simple.

Description

technical field [0001] The invention relates to a physical simulation method for plastic deformation of a friction welding joint. The physical simulation method can effectively simulate the plastic metal flow behavior of rotary friction welding (including continuous drive friction welding and inertia friction welding) and linear friction welding joint, revealing the above-mentioned Conditions and flow laws of plastic metal flow in joints under friction welding conditions. Background technique [0002] Friction welding is under the action of axial pressure, using the friction heat generated by the relative rotation or linear motion between the contact end faces of the workpiece to make the contact interface and its surrounding area reach a plastic state, and the plastic metal is extruded under pressure to form flash , and then quickly upset to complete a solid-phase connection method of welding. Since friction welding actually welded qualified welded joints in the 1950s, fri...

Claims

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Application Information

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IPC IPC(8): G01N11/00G01N33/20
Inventor 李文亚马铁军李京龙高大路
Owner NORTHWESTERN POLYTECHNICAL UNIV
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