Ultrasonic impact treatment process for reducing residual stress of aluminium alloy box girder welded structure

A welding structure, ultrasonic impact technology, applied in the field of technology

Inactive Publication Date: 2011-08-31
NO 52 INST OF CHINA NORTH IND GRP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical solution of the present invention is to overcome the disadvantages of the prior art to eliminate the shortcomings of the welding residual stress process of the aluminum alloy box girder welding structure, and to

Method used

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  • Ultrasonic impact treatment process for reducing residual stress of aluminium alloy box girder welded structure
  • Ultrasonic impact treatment process for reducing residual stress of aluminium alloy box girder welded structure
  • Ultrasonic impact treatment process for reducing residual stress of aluminium alloy box girder welded structure

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 2 As shown, the 6mm thick aluminum alloy box girder welded structural support is subjected to ultrasonic impact treatment. It includes the following steps:

[0029] The first step: the selection of the impact head: according to the wall thickness of the aluminum alloy bracket is 6mm and the welding seam is a corner butt joint structure, so choose a double-row small impact head with a diameter of 4mm;

[0030] Step 2: Optimization of ultrasonic shock treatment process parameters: optimize the shock treatment process according to the wall thickness of the aluminum alloy bracket is 6mm, the impact speed is 1.3mm / min, the width is 10mm, the number of times is 4 times, and the impact angle is 90°;

[0031] The third step: impact treatment on the aluminum alloy box girder welded structure: use the optimized ultrasonic impact process to process the two long welds of the aluminum alloy bracket;

[0032] The fourth step: effect evaluation: by comparing the weld...

Embodiment 2

[0034] Ultrasonic impact treatment was performed on a 15 mm thick aluminum alloy rectangular beam. It includes the following steps:

[0035] The first step: the selection of the impact head: according to the thickness of the aluminum alloy rectangular beam is 15mm and the welding seam is a flat butt joint structure, so choose a double-row medium-sized impact head with a diameter of 6mm;

[0036] The second step: optimization of ultrasonic impact treatment process parameters: optimize the impact treatment process according to the wall thickness of the aluminum alloy rectangular beam of 15mm, the impact speed is 1.0mm / min, the width is 12mm, and the impact angle is 90°;

[0037] The third step: impact treatment on the aluminum alloy rectangular beam welded structure: use the optimized ultrasonic impact process to process the two long welds of the aluminum alloy rectangular beam;

[0038] Step 4: Effect evaluation: By comparing the welding residual stress state of the welding se...

Embodiment 3

[0040] Ultrasonic impact treatment is performed on the 25mm thick aluminum alloy box. It includes the following steps:

[0041] The first step: the selection of the impact head: according to the wall thickness of the aluminum alloy bracket is 25mm and the welding seam is a corner joint structure, so choose a single row of large impact head with a diameter of 8mm;

[0042] Step 2: Optimization of ultrasonic impact treatment process parameters: optimize the impact treatment process according to the wall thickness of the aluminum alloy box is 25mm, the impact speed is 0.8mm / min, the width is 14mm, and the impact angle is 80°~90°;

[0043] The third step: impact treatment on the welded structure of the aluminum alloy box: use the optimized ultrasonic impact process to treat the 12 long welds of the aluminum alloy box;

[0044]Step 4: Effect evaluation: By comparing the welding residual stress state of the welding seam of the aluminum alloy box welding structure that has undergone...

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Abstract

The invention belongs to the field of process technology, and relates to an ultrasonic impact treatment process for reducing residual stress of an aluminium alloy box girder welded structure. The process includes the specific steps of impact head selection which is carried out by selecting an impact head according to the thickness of an aluminium alloy plate or the height of a weld corner, and selecting a single-row or a double-row impact head according to the position of a welded seam; ultrasonic impact treatment process parameter optimization which is carried out by optimizing the impact treatment process according to the thickness of the aluminium alloy plate and the height of the welded corner; the aluminium alloy box girder welded structure impact treatment which is carried out by adopting an optimized ultrasonic impact treatment process to the welded seam of the aluminium alloy box girder welded structure; and effect evaluation which is carried out by verifying the reduction effect of the ultrasonic impact treatment process to the welding residual stress. The advantages of the treatment process are that the treatment process can be repeatedly used without limit while maintaining a good precision; the treatment process can carry out a treatment on a welded seam pertinently and selectively; and the treatment process has a remarkable effect on eliminating the welding residual stress, more than 60% of the welding residual stress can be eliminated.

Description

technical field [0001] The invention belongs to the field of technology and relates to an ultrasonic impact treatment process for reducing the residual stress of aluminum alloy box girder welded structures, which is suitable for the treatment of welding residual stress of aluminum alloy box girder welded structures with a thickness of 3 mm to 30 mm. Background technique [0002] With the demand for light weight of large structural parts, more and more structural parts use aluminum alloy box girder welded structure. Due to the characteristics of the structure and the fusion welding process adopted, there is a large welding residual stress in the structural parts after welding. If the welding residual stress is not controlled, the structural parts are prone to fatigue cracking when subjected to alternating loads, resulting in product failure. Therefore, measures must be taken to eliminate welding residual stress. The usual measures are: one is to eliminate the residual stress ...

Claims

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Application Information

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IPC IPC(8): C22F3/00
Inventor 陈东高谭兵王有祁马冰王冬生明珠王法科程朝丰马志华
Owner NO 52 INST OF CHINA NORTH IND GRP CORP
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