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A method for improving fatigue properties of steel plates and butt welded joints

A technology for welded 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 effects of reducing stress intensity factor, reducing degumming and improving fatigue performance

Active Publication Date: 2022-07-05
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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  • A method for improving fatigue properties of steel plates and butt welded joints
  • A method for improving fatigue properties of steel plates and butt welded joints
  • A method for improving fatigue properties of steel plates and butt welded joints

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 a steel plate and a butt welded joint, the steps of which are:

[0063] Step A, Ultrasonic Impact Treatment

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

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

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

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

[0068] Step A2, finally use the impact head to fully cover the welding seam for impact treatment;

[0069] Step...

Embodiment 2

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

[0082] Step A, Ultrasonic Impact Treatment

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

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

[0085] Step A12: After the first impact treatment is completed, a single row of cylindrical impact heads with a diameter of 7mm are used to perform the second impact treatment on the weld toe, and the speed is controlled at 70mm / 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 a third impact treatment on the unsmoothed part of the weld toe, and the speed is controlled at 70mm / min;

[0087] Step A14: Finally, the sheet-shaped impact head is used...

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Abstract

The present application relates to the field of material surface strengthening, and in particular to a method for improving the fatigue performance of steel plates and butt welded joints. Carry out impact treatment, and then fully cover the weld seam; step B, CFRP reinforcement treatment, after the ultrasonic impact treatment of the weld seam of the steel plate is completed, the steel plate and the weld seam are subjected to CFRP reinforcement treatment, including: surface treatment, glue treatment and paste and Surface reinforcement. In the present application, ultrasonic impact treatment is first performed on the welded joints, and then CFRP reinforcement treatment is performed on the welded joints and steel plates, so as to delay the development of fatigue cracks in the microcrack stage and macrocrack propagation stage before fatigue failure, and comprehensively improve the fatigue performance of the joints.

Description

technical field [0001] The present application relates to the field of material surface strengthening, in particular to a method for improving the fatigue properties of steel plates and butt welded joints. Background technique [0002] 1. Metal fatigue failure can be divided into 3 stages: [0003] 1. In the microcrack stage, under cyclic loading, since the highest stress of the object usually occurs in the surface or near-surface region, the resident slip zones, grain boundaries and inclusions in this region develop into serious stress concentration points and form first Micro cracks. After that, the crack propagated along the direction of the maximum shear stress at an angle of about 45° to the principal stress, and the crack length was roughly within 0.05 mm, and developed into a macroscopic crack. [0004] 2. In the macroscopic crack propagation stage, the crack basically propagates along the direction perpendicular to the principal stress. [0005] 3. In the instanta...

Claims

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Application Information

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Patent Type & Authority Patents(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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