Method for reducing welding stress of steel structure product

A welding stress and steel structure technology, applied in the field of steel structure welding, can solve problems affecting the performance of steel structures, reduce the stiffness of welded joints, weld cracks, etc., and achieve the goal of reducing welding stress hazards, reducing structural deformation, and improving stability Effect

Active Publication Date: 2019-07-05
安徽森钢建筑工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the metal yield effect in the weld area, while reducing the stiffness of the welded joint, the consequences will affect the performance of the steel structure
If the unreleased welding residual stress is too large, welding cracks may even occur

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for reducing the welding stress of steel structure products, the method for reducing the welding stress of steel structure products specifically includes the following steps:

[0024] 1). Preheating: first heat the steel structure products to 600°C under program-controlled heating, and the temperature rise rate is 2.5°C / min. 1.5℃ / min;

[0025] 2). Welding: Combine the steel structure products while they are hot, and use argon arc welding to weld the steel structure products, control the number of welds inside a single weld bead to 50cm / piece, and avoid 2 or 3 welds vertically Cross, control the thickness deviation of the weld to 0-0.3cm, and control the number of weld beads inside a single weld layer to be 3-5 per layer;

[0026] 3). Cooling: Cool the welded steel structure products to 10°C, the temperature drop rate is 0.5°C / min, and keep the temperature for 24 hours when the temperature reaches the lowest point;

[0027] 4). Annealing: raise the temperature...

Embodiment 2

[0038] A method for reducing the welding stress of steel structure products, the method for reducing the welding stress of steel structure products specifically includes the following steps:

[0039] 1). Preheating: first heat the steel structure products to 400°C under program-controlled heating, and the temperature rise rate is 1.0°C / min. 0.5℃ / min;

[0040] 2). Welding: Combine the steel structure products while they are hot, and use argon arc welding to weld the steel structure products, control the number of welds inside a single weld bead to 30cm / piece, and avoid 2 or 3 welds vertically Cross, control the thickness deviation of the weld seam to 0-0.5cm, and control the number of weld beads inside a single welding layer to 3-4 per layer;

[0041] 3). Cooling: Cool the welded steel structure products to 5°C, the temperature drop rate is 0.1°C / min, and keep the temperature at the lowest point for 18 hours;

[0042] 4).Annealing: raise the temperature of the steel structure...

Embodiment 3

[0053] A method for reducing the welding stress of steel structure products, the method for reducing the welding stress of steel structure products specifically includes the following steps:

[0054] 1). Preheating: first heat the steel structure products to 500°C under program-controlled heating, and the temperature rise rate is 1.5°C / min. 1.0℃ / min;

[0055] 2). Welding: Combine the steel structure products while they are hot, and use argon arc welding to weld the steel structure products, control the number of welds inside a single weld bead to 40cm / piece, and avoid 2 or 3 welds vertically Cross, control the thickness deviation of the weld seam to 0-0.2cm, and control the number of weld beads inside a single welding layer to 4-6 per layer;

[0056] 3). Cooling: Cool down the welded steel structure products to 5°C, the temperature drop rate is 0.2°C / min, and keep the temperature at a constant temperature for 20 hours when the temperature reaches the lowest point;

[0057] 4...

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PUM

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Abstract

The invention relates to a method for reducing welding stress of a steel structure product. The method comprises the following steps that the steel structure product undergoes heating and constant-temperature heat preservation under program control firstly, and then is cooled to the welding temperature; welding is performed while the steel structure product is hot, and number of welding seams andthe number of welding beads are controlled; the steel structure product is cooled to the low temperature after being welded for heat preservation and refrigeration; the steel structure product is heated to the high temperature again, the temperature is kept for a period of time, and then the steel structure product is cooled to the room temperature; a vibration aging device is adopted for vibration treatment during temperature rising and temperature constancy; and finally, the steel structure is polished and ground, and waterproof grease is smeared on a grinding area. According to the method,the steel structure product undergoes preheating, welding, cooling, annealing, vibration and other welding stress elimination methods for comprehensive welding stress elimination, the welding stress is reduced by 90% or above, the damage of the welding stress to the steel structure is avoided, then the strength, the rigidity and the hardness of the steel structure product are improved, the safetyof the steel structure product during use is ensured, the hazard of the welding stress is greatly reduced, the structure deformation is reduced, and then the stability of the steel structure is improved.

Description

technical field [0001] The invention relates to the technical field of steel structure welding, in particular to a method for reducing welding stress of steel structure products. Background technique [0002] The steel structure has the advantages of high strength, good toughness, good seismic performance, and fast construction speed. It is very suitable for the development of modern engineering structures to towering, long-span, and heavy-duty structures, and engineering applications are increasing. In super high-rise buildings, long-span buildings and long-span bridges, heavy-duty industrial plants and special structures, the thickness of steel plates required for main stress components such as beams, columns, supports, shear walls, and trusses is increasing. Even if a combined structure that can give full play to the respective advantages of steel and concrete and significantly reduce the wall thickness of the steel plate is adopted, the thickness of the steel used to mee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00C21D10/00C21D1/26
CPCB23P15/00C21D1/26C21D10/00
Inventor 丁伟
Owner 安徽森钢建筑工程有限公司
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