Method for enhancing metal material welded joint via bionic coupling

A technology of welded joints and metal materials, applied in the direction of welding connection, welding equipment, welding accessories, etc., can solve the problems that restrict the wide application of welded structures, achieve the effect of inhibiting the initiation of fatigue cracks and improving the service life

Active Publication Date: 2016-06-22
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the fatigue fracture of welded structures, there is often no obvious plastic deformation, which will lead to catastrophic accidents, which restricts the further wide application of welded structures to a certain extent, so that some occasions have to give up the use of welded structures, and even doubt whether the welded structure can be used. Applicable to engineering practice under dynamic load

Method used

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  • Method for enhancing metal material welded joint via bionic coupling
  • Method for enhancing metal material welded joint via bionic coupling
  • Method for enhancing metal material welded joint via bionic coupling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] refer to figure 2 , using a laser beam to prepare a point-like bionic coupling unit 4 on the surface of the weld 3, wherein the point-like bionic coupling unit 4 has a diameter d 1 1mm, along the welding direction distribution spacing s 1 3mm, spacing s along the docking direction 1 ’ is 3mm, depth h 1 0.5mm. Then the magnesium alloy welded joint strengthened by bionic coupling was compared with Figure 15 Dimensions machined into fatigue test pieces, in a cycle base of 2×10 6 Under the number of times, compared with the test piece without bionic coupling strengthening, the fatigue strength of bionic coupling strengthening increased by 8.0%.

Embodiment 2

[0059] refer to image 3 , using a laser beam to prepare a point-like bionic coupling unit 4 on the surface of the heat-affected zone 2, wherein the point-like bionic coupling unit 4 has a diameter d 2 0.6mm, along the welding direction distribution spacing s 2 3mm, spacing s along the docking direction 2 ’ is 1mm, the depth h 2 0.5mm. Then the magnesium alloy welded joints strengthened by bionic coupling refer to Figure 15 Dimensions machined into fatigue test pieces, in a cycle base of 2×10 6 Under the number of times, compared with the test piece without bionic coupling strengthening, the fatigue strength of bionic coupling strengthening increased by 4.2%.

Embodiment 3

[0061] refer to Figure 4 , using laser beams to prepare point-like bionic coupling units 4 on the surface of the weld 3 and the heat-affected zone 2, wherein the diameter of the point-like bionic coupling units 4 in the weld 3 is d 1 1mm, along the welding direction distribution spacing s 1 3mm, spacing s along the docking direction 1 ’ is 3mm, depth h 1 0.5mm. Diameter d of point-like bionic coupling unit 4 in heat-affected zone 2 2 0.6mm, along the welding direction distribution spacing s 2 3mm, spacing s along the docking direction 2 ’ is 1mm, the depth h 2 0.5mm. Then the magnesium alloy welded joints strengthened by bionic coupling refer to Figure 15 Dimensions machined into fatigue test pieces. In a cyclic base of 2×10 6 Under the number of times, compared with the test piece without bionic coupling strengthening, the fatigue strength of bionic coupling strengthening increased by 9.7%.

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Abstract

A method for enhancing a metal material welded joint via bionic coupling comprises the following steps: I, welding at butting parts of the metal material, so as to form the welded joint, wherein the welded joint comprises a weld seam and heat affected zones on two sides of the weld seam; II, polishing the welded joint to remove excess weld metal; III, preparing a bionic coupling unit on the weld seam or / and the heat affected zones with a laser beam. According to the method, based on the bionic coupling principle, bionic design is conducted on the metal material welded joint with the laser beam to form the bionic coupling unit, tissues in a laser beam processed zone are refined, the mechanical property is improved, and generation of fatigue crack under alternating load can be inhibited effectively; moreover, the laser beam processed zone serving as a hard phase can effectively retard expansion of the fatigue crack, so as to effectively prolong the service life of a metal material welding structure.

Description

technical field [0001] The invention relates to improving the performance of welded joints of metal materials, in particular to a method for strengthening welded joints of metal materials by adopting bionic coupling. Background technique [0002] Fatigue failure is a main form of failure of metal welded structures. It occurs in components subjected to alternating loads. When the welded structure is damaged, the maximum stress it receives is usually lower than the tensile strength of the material, sometimes even lower Due to the yield strength of the material, according to statistics, the failure and fracture accidents of welded structures caused by fatigue cracks account for more than 70-80% of the total fracture accidents, of which about 50-90% are fatigue failures. Due to the fatigue fracture of welded structures, there is often no obvious plastic deformation, which will lead to catastrophic accidents, which restricts the further wide application of welded structures to a ...

Claims

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Application Information

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IPC IPC(8): B23K9/167B23K9/32
CPCB23K9/167B23K9/323
Inventor孟超董鹏李刚康清海
OwnerLIAONING TECHNICAL UNIVERSITY