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Welding method of high-strength steel

A welding method and technology of high-strength steel, applied in welding equipment, welding accessories, arc welding equipment, etc., can solve the problem of low welding joint strength, and achieve the effect of easy execution, avoiding switching welding wires back and forth, and simple operation.

Inactive Publication Date: 2021-07-16
湖南华菱涟钢特种新材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the embodiments of the present application is to provide a high-strength steel welding method to solve the technical problems of low welding joint strength and the need to replace the welding wire in the prior art

Method used

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  • Welding method of high-strength steel
  • Welding method of high-strength steel
  • Welding method of high-strength steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Use a 6mm thick steel plate with a yield strength of 1300MPa, open a 50°V-shaped groove, preheat at 100°C before welding, and use Bole GM120 welding wire to complete the welding of the bottom layer and the welding of the cover layer. The welding parameters are as follows: (1) Boring: welding Current 130A, welding voltage 20V, welding speed 160mm / min; (2) Overlay welding: welding current 260A, welding voltage 27.5V, welding speed 450mm / min. The interlayer temperature is controlled at 120-200°C. It can swing properly to ensure good fusion between the weld seam and both sides of the groove.

[0050] Through the above method, smooth welded joints can be obtained without defects such as cracks and pores, and the mechanical properties are good; the tensile strength of the weld metal at room temperature is greater than 1217MPa, and the impact energy of the V-notch impact test of the weld metal at the test temperature of -40°C Greater than 47J, the 6a cold bending test is qual...

Embodiment 2

[0052] Use 8mm thick steel plate with yield strength of 1300MPa, open 60°V-shaped groove, preheat 100°C before welding, and use Bole GM120 welding wire to complete the welding of the bottom layer and the welding of the cover layer. The welding parameters are as follows: (1) bottom layer welding: Welding current 140A, welding voltage 20.5V, welding speed 170mm / min; (2) Overlay welding: welding current 270A, welding voltage 29V, welding speed 430mm / min. The interlayer temperature is controlled at 120-200°C. It can swing properly to ensure good fusion between the weld seam and both sides of the groove.

[0053] Through the above method, smooth welded joints can be obtained without defects such as cracks and pores, and the mechanical properties are good; the tensile strength of the weld metal at room temperature is greater than 1240MPa, and the impact energy of the V-notch impact test of the weld metal at the test temperature of -40°C Greater than 47J, the 6a cold bending test is...

Embodiment 3

[0055] A 12mm thick steel plate with a yield strength of 1300MPa is used, a 60°V-shaped groove is opened, and the preheating is 130°C before welding. Bole GM120 welding wire is used to complete the welding of the bottom layer, filling layer and cover layer. The welding parameters are as follows: (1) Underlayer welding: welding current 140A, welding voltage 20.5V, welding speed 170mm / min; (2) Filling layer welding and cover layer welding: welding current 260A, welding voltage 27.5V, welding speed 450mm / min. The interlayer temperature is controlled at 120-200°C. It can swing properly to ensure good fusion between the weld seam and both sides of the groove.

[0056] Through the above method, smooth welded joints can be obtained without defects such as cracks and pores, and the mechanical properties are good; the tensile strength of the weld metal at room temperature is greater than 1220MPa, and the impact energy of the V-notch impact test of the weld metal at the test temperature...

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Abstract

The invention provides a welding method for high-strength steel. The welding method comprises the following steps that a high-strength welding wire is used at a welded junction of a steel plate to carry out gas shielded welding, and the gas shielded welding comprises the step of sequentially carrying out priming layer welding and capping layer welding at the welded junction, wherein the heat input of the gas shielded welding is 0.8-1.5 kJ / mm, the gas flow is 15-25 L / min, and the interlayer temperature between the priming layer welding and the capping layer welding is controlled to be 120-200 DEG C. According to the welding method of the high-strength steel, the heat input and the interlayer temperature are strictly controlled to be within a proper range, the structure and grain size are guaranteed, and therefore it is guaranteed that a weld joint obtains good obdurability matching; the certain toughness is achieved while the strength of the welding wire is ensured; and a welding joint with high strength and good toughness and plasticity is obtained. Moreover, the welding method for the high-strength steel produced by the method adopts the same high-strength steel welding wire in the whole process, so that the welding wire is prevented from being switched back and forth, operation is simple, the implementation is easy in production, the method can be popularized to automatic robot welding, and efficient production is realized.

Description

technical field [0001] The application belongs to the technical field of metal smelting methods, and in particular relates to a welding method for high-strength steel. Background technique [0002] Due to its high strength and good plasticity and toughness, high-strength steel is gradually used in construction machinery, port machinery, coal mining machinery and other fields, such as large-tonnage crane booms, concrete pump truck booms, fire truck pump trucks, etc. Jib frame, high-performance hydraulic support, super-large tonnage port crane, etc. Due to the increasingly high requirements for lightweight, high-strength steel has great advantages in terms of reducing dead weight, increasing carrying capacity, and reducing transportation and installation costs. The application of high-strength low-alloy high-strength steel has become the selling point and advantage of mechanical products in these industries. Domestic steel mills have successfully developed ultra-high-strengt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/235B23K9/32
CPCB23K9/16B23K9/235B23K9/32
Inventor 张永林曾威民梁亮李光辉肖爱达李国仓刘浩
Owner 湖南华菱涟钢特种新材料有限公司
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