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-men

Method used

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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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Example Embodiment

[0035] Implementation example 1:

[0036] This example studies the deformation behavior of linear friction welding joints. First, aluminum alloy is selected as the research object, and stainless steel is sampled as the dual sample. The characteristic dimension of aluminum alloy is a rectangular cross section of 10mm×17mm, and the sample length is 50mm; due to the large deformation of aluminum alloy, the characteristic dimension of stainless steel is 35mm×60mm, and the sample length is also 50mm. The 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 is used to measure the temperature of the center interface (reference 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 in the whole process ...

Example Embodiment

[0037] Implementation example 2:

[0038] The 20# steel rod with a diameter of 20mm is 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 is used for the test, the rotating clamp clamps 20# steel, and the mobile clamp clamps the molybdenum alloy (see attached image 3 a); friction test process parameters: friction pressure 10kN, speed 1200rpm, friction time 3s, 5s and 7s, the photos during the friction process are attached image 3 b. After welding, the two workpieces were tapped to separate, and the research object was air-cooled. After welding, the dual specimen did not deform, the research object had obvious flash, and the flash formed well ( Figure 4 ). Measure the macroscopic amount of plastic deformation of the joint ( Figure 5 ), as the friction time increases, both th...

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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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