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Method for reducing welding residual stress of thick plate by utilizing multi-layer and multi-pass welding interlayer welding residual heat to assist vibration

A technology of multi-layer multi-pass welding and residual stress, applied in heat treatment furnaces, heat treatment equipment, process efficiency improvement, etc., can solve problems such as poor adaptability, influence on welding process, poor safety, etc., and achieve efficiency improvement, improve efficiency, and operate convenient effect

Inactive Publication Date: 2012-10-17
HARBIN INST OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problems of poor safety, poor adaptability and influence on the welding process in the existing method for reducing the residual stress of thick plate welding, and then provide a method for using multi-layer multi-pass welding interlayer welding residual heat to assist vibration Method for Reducing Welding Residual Stress of Thick Plate

Method used

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  • Method for reducing welding residual stress of thick plate by utilizing multi-layer and multi-pass welding interlayer welding residual heat to assist vibration
  • Method for reducing welding residual stress of thick plate by utilizing multi-layer and multi-pass welding interlayer welding residual heat to assist vibration
  • Method for reducing welding residual stress of thick plate by utilizing multi-layer and multi-pass welding interlayer welding residual heat to assist vibration

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specific Embodiment approach 1

[0020] Specific implementation mode one: combine Figure 1-Figure 5 Describe this embodiment, the specific steps of the method for reducing the residual stress of thick plate welding by using the residual heat of multi-layer multi-pass welding interlayer welding to assist vibration to reduce the residual stress of thick plate welding in this embodiment are:

[0021] Step 1, fixing the vibrator 6 on the vibrating platform 3;

[0022] Step 2, clamping the workpiece 1 to be welded on the vibration platform 3 through the clamping gasket 4 and the workpiece clamping cover plate 5 on the welding fixture;

[0023] Step 3: Scan the frequency before vibration, fix the acceleration sensor 2 on the workpiece 1 to be welded, use the acceleration sensor 2 to pick up the amplitude, and obtain the first-order or second-order resonance by gradually increasing the frequency of the exciter 6 and obtaining the amplitude signal at the same time Frequency, adjust the excitation force at the sub-r...

specific Embodiment approach 2

[0027] Specific embodiment 2: Vibration aging treatment for 10 minutes in step 5 of this embodiment. With such setting, the efficiency of vibration aging is greatly improved, and the residual stress of the welded workpiece is effectively reduced.

Embodiment

[0028] Example: Combine Figure 1-Figure 8 Further illustrate the present invention, the present embodiment adopts workpiece material to be low-alloy high-strength steel, and the main chemical composition mass percentage of this low-alloy high-strength steel: C is 0.15%, Si is 0.32%, Mn is 1.44%, and its tensile strength is 575MPa , with a yield strength of 470Mpa, made as figure 2 The butt joint sample of workpiece 1 to be welded, the workpiece size is 200mm×300mm×14mm, with a 30° groove, and a blunt edge of 2mm. When welding, a 3mm gap is reserved between the two workpieces. Manual arc welding is used, and the welding rod is J422. Weld four layers.

[0029] The thermal cycle curve at the center of the weld is obtained through finite element simulation before welding, such as Figure 6 As shown, it can be seen that after less than 10 minutes (600 seconds) after welding, the temperature of the workpiece drops below 100°C, and then the temperature drops slowly. Therefore, t...

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Abstract

The invention relates to a method for reducing a welding residual stress of a thick plate by utilizing multi-layer and multi-pass welding interlayer welding residual heat to assist vibration and relates to a method for reducing inner residual stress of a welding piece of multi-layer and multi-pass welding, so as to solve the problems that the safety of the method for reducing the welding residual stress of the thick plate is poor, the adaptability is poor and a welding process is influenced. The method comprises the following specific steps of: step 1, fixing a vibration exciter on a vibration platform; step 2, clamping a work piece to be welded on the vibration platform through a clamping gasket and a work piece clamping plate on a welding clamp; step 3, sweeping frequency before vibration and obtaining a fixed frequency of the work piece to be welded under a sub-resonance frequency by adjusting an exciting force; step 4, welding the work piece to be welded; and step 5, after one layer is welded, carrying out vibration ageing effect treatment according to the fixed frequency determined by the step 3 for 5-12 min under the state of the welding residual heat; and repeating the process until the a welding process is finished. The method disclosed by the invention is used for reducing the residual stress after the welding work piece of the thick plate is welded.

Description

technical field [0001] The invention relates to a method for reducing the internal residual stress of a multi-layer multi-pass welding weldment, in particular to a method for reducing the residual stress of a thick plate weldment by utilizing the residual heat of welding between each pass of multi-layer multi-pass welding to assist vibration aging and reduce the residual stress of a thick plate weldment. Vibration aging field. Background technique [0002] The distribution of residual stress after welding of thick plates is significantly different from the distribution of residual stress after welding of thin plates. The distribution of residual stress in the thickness direction of thick plates is very complicated. When welding thick plates, the state of residual stress is different with the thickness of the plate. For the welding of steel plates, usually when the plate thickness is 40-60mm thick, the residual stress in the member is the largest; when the plate thickness is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/50C21D10/00
CPCY02P10/20
Inventor 刘雪松方洪渊李书齐代永锋乐望赟崔炜
Owner HARBIN INST OF TECH
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