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Method for improving fatigue performance of steel plate and butt-welded joint

A technology for welding joints and fatigue performance, applied in the field of material surface strengthening, can solve the problems of single metal surface strengthening process and low degree of strengthening, and achieve the effect of increasing the bonding effect, reducing the degumming and improving the fatigue performance.

Active Publication Date: 2021-01-22
CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In order to improve the problem of single metal surface strengthening process and low strengthening degree, this application provides a method for improving the fatigue performance of steel plates and butt welded joints

Method used

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  • Method for improving fatigue performance of steel plate and butt-welded joint
  • Method for improving fatigue performance of steel plate and butt-welded joint
  • Method for improving fatigue performance of steel plate and butt-welded joint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The CFRP material is CFRP cloth.

[0062] A method for improving the fatigue performance of steel plates and butt welded joints, the steps of which are:

[0063] Step A, ultrasonic shock treatment

[0064] Step A1, using an impact head to perform two impact treatments on the weld toe;

[0065] Step A11, using three rows of cylindrical impact heads with a diameter of 2 mm to perform the first impact treatment on the welding toe, and the speed is controlled at 60 mm / min;

[0066] Step A12, after the first impact treatment is completed, use a single row of cylindrical impact heads with a diameter of 5 mm to perform a second impact treatment on the welding toe, and the speed is controlled at 60 mm / min;

[0067] Step A13. Finally, use a sheet-shaped impact head to perform full-coverage impact treatment on the weld seam, and the speed is controlled at 30mm / min;

[0068] Step A2, finally using the impact head to impact the full coverage of the weld seam;

[0069] Step B, C...

Embodiment 2

[0081] A method for improving the fatigue performance of steel plates and butt welded joints, the steps of which are:

[0082] Step A, ultrasonic shock treatment

[0083] Step A1, using an impact head to perform three impact treatments on the weld toe;

[0084] Step A11, using three rows of cylindrical impact heads with a diameter of 3 mm to perform the first impact treatment on the welding toe, and the speed is controlled at 70 mm / min;

[0085] Step A12, after the first impact treatment is completed, use a single row of cylindrical impact heads with a diameter of 7 mm to perform a second impact treatment on the welding toe, and the speed is controlled at 70 mm / min;

[0086] Step A13, after the second impact treatment is completed, use a single row of cylindrical impact heads with a diameter of 7mm to perform the third impact treatment on the unsmooth part of the welding toe, and the speed is controlled at 70mm / min;

[0087] Step A14. Finally, use a sheet-shaped impact head ...

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Abstract

The application relates to the field of material surface strengthening, in particular to a method for improving the fatigue performance of a steel plate and a butt-welded joint. The method comprises the following steps: step A, ultrasonic impact treatment: firstly, carrying out impact treatment on a weld toe part of a welded joint of the steel plate by using an ultrasonic impact head, and then carrying out full-coverage impact treatment on the welded joint; and step B, CFRP reinforcing treatment: after ultrasonic impact treatment of the weld joint of the steel plate is completed, performing CFRP reinforcing treatment on the steel plate and the weld joint, which includes surface treatment, glue treatment and pasting and surface reinforcing. According to the application, ultrasonic impact treatment is conducted on the welded joint, then CFRP reinforcing treatment is conducted on the welded joint and the steel plate, fatigue crack development is delayed in the microcrack stage and the macrocrack propagation stage before fatigue damage, and the fatigue performance of the joint is comprehensively improved.

Description

technical field [0001] The application relates to the field of material surface strengthening, in particular to a method for improving the fatigue performance of steel plates and butt welded joints. Background technique [0002] 1. Metal fatigue damage can be divided into three stages: [0003] 1. In the stage of microscopic cracks, under cyclic loading, since the highest stress of the object is usually generated in the surface or near-surface area, the resident slip zone, grain boundary and inclusions in this area develop into serious stress concentration points and first form microscopic cracks. After that, the crack propagates along the direction of the maximum shear stress at an angle of about 45° to the principal stress, and the crack length is roughly within 0.05 mm, developing into a macroscopic crack. [0004] 2. In the stage of macroscopic crack propagation, the crack basically expands along the direction perpendicular to the principal stress. [0005] 3. In the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D10/00B32B5/02B32B5/26B32B7/12B32B15/14B32B15/18B32B37/00B32B37/12B32B38/16
CPCC21D10/00B32B15/18B32B15/14B32B5/02B32B5/26B32B7/12B32B37/12B32B37/003B32B38/162
Inventor 郑云岳清瑞常好诵陈煊逯鹏赵寒川
Owner CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP
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