A method of strengthening welded joints of metal materials using bionic coupling

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

Active Publication Date: 2018-02-06
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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  • A method of strengthening welded joints of metal materials using bionic coupling
  • A method of strengthening welded joints of metal materials using bionic coupling
  • A method of strengthening welded joints of metal materials using 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 strengthening a welded joint of a metal material by using bionic coupling, comprising step 1: welding at the butt joint of the metal material, forming a welded joint after welding, the welded joint including a weld seam and heat-affected joints located on both sides of the weld seam area; Step 2: Grinding the welded joint to remove welding reinforcement; Step 3: Using a laser beam to prepare a bionic coupling unit in the weld seam or / and the heat-affected zone. Based on the principle of coupling bionics, the invention utilizes laser beams to carry out bionic design on welded joints of metal materials to form a bionic coupling unit. The microstructure of the laser beam treatment area is refined and the mechanical properties are improved, which can effectively inhibit the initiation of fatigue cracks under alternating loads. In addition, As a hard phase, the laser beam treatment area can effectively block the expansion of fatigue cracks, thereby effectively improving the service life of the metal material welded 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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Patent Type & AuthorityPatents(China)
IPC IPC(8): B23K9/167B23K9/32
CPCB23K9/167B23K9/323
Inventor孟超董鹏李刚康清海
OwnerLIAONING TECHNICAL UNIVERSITY