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A kind of high-grade wear-resistant steel carbon dioxide gas shielded welding method

A gas shielded welding and carbon dioxide technology, applied in welding medium, welding equipment, welding equipment and other directions, can solve the problems of high hardening tendency and embrittlement, and achieve the advantages of improved impact toughness, simple welding process and improved welding construction conditions. Effect

Active Publication Date: 2016-08-24
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the increase of the grade of wear-resistant steel, the content of carbon element in the steel is also increased to 0.24% ~ 0.30%, and elements that can improve hardenability such as Cr, Mo, and B are added, and the hardening tendency is relatively large. Under the welding conditions of rapid heating and rapid cooling, it is easy to produce hardened martensite structure, which leads to the generation of welding cold cracks and the embrittlement of welding heat-affected zone

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A carbon dioxide gas shielded welding method for high-grade wear-resistant steel. The high-grade wear-resistant steel plate with a hardness level of HB500 is selected, the thickness is 25mm, and the combination of thick plates is 25mm+25mm. The size of the test plate is 450mm×400mm×25mm; the chemical composition and weight percentage of the welding wire are: C: 0.06%, Mn: 1.85%, Si: 0.80%, P: 0.025%, S: 0.025%, and the balance is Fe and unavoidable impurities;

[0015] The gas shielded welding groove adopts an asymmetrical double-sided X-shaped groove, the groove angle is 60°, the groove gap is 1mm, and the blunt edge is 0mm; before welding, the rust and oil stains on the groove surface and the surrounding 20mm range should be removed by grinding; For fixed point butt welding and bottom welding, the preheating temperature before welding is 120°C, and the preheating range is not less than 75mm on both sides of the welding groove; welding process parameters: welding curre...

Embodiment 2

[0018] A carbon dioxide gas shielded welding method for high-grade wear-resistant steel. The high-grade wear-resistant steel plate with a hardness level of HB500 is selected, the thickness is 25mm, and the combination of thick plates is 25mm+25mm. The size of the test plate is 450mm×400mm×25mm; the chemical composition and weight percentage of the welding wire are: C: 0.15%, Mn: 1.40%, Si: 1.15%, P: 0.020%, S: 0.020%, and the balance is Fe and unavoidable impurities;

[0019] The gas shielded welding groove adopts an asymmetrical double-sided X-shaped groove, the groove angle is 60°, the groove gap is 0.5mm, and the blunt edge is 0.5mm; before welding, the groove surface and the surrounding 20mm range of rust and Oil pollution; during fixed point butt welding and bottom welding, the preheating temperature before welding is 120°C, and the preheating range is not less than 75mm on both sides of the welding groove; welding process parameters: welding current 270A, arc voltage 30V...

Embodiment 3

[0022]A carbon dioxide gas shielded welding method for high-grade wear-resistant steel. The high-grade wear-resistant steel plate with a hardness level of HB500 is selected, the thickness is 25mm, and the combination of thick plates is 25mm+25mm. The size of the test plate is 450mm×400mm×25mm; the chemical composition and weight percentage of the welding wire are: C: 0.10%, Mn: 1.55%, Si: 0.95%, P: 0.015%, S: 0.010%, and the balance is Fe and Unavoidable impurities; the gas shielded welding groove adopts an asymmetrical double-sided X-shaped groove, the groove angle is 60°, the groove gap is 1mm, and the blunt edge is 0.5mm; before welding, remove the impurities within 20mm around the weld. Rust and oil stains; during fixed point butt welding and bottom welding, the preheating temperature before welding is 120°C, and the preheating range is not less than 75mm on both sides of the welding groove; welding process parameters: welding current 300A, arc voltage 32V , the welding sp...

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Abstract

The invention belongs to the technical field of iron and steel material welding, and relates to a carbon dioxide gas shielded welding method for high-grade wear-resistant steel. High-grade wear-resistant steel plates with a hardness level of HB500 are used, the thickness of which is 25mm or less, and the combination of the same plate thickness is used for butt joints; according to the different requirements of the structure on mechanical properties, welding wires with a tensile strength Rm≥500MPa are selected, and the fixed points are aligned. For welding and backing welding, preheat to 120°C before welding; for continuous welding, the temperature between the fill and cover weld bead should not be lower than 120°C and not higher than 200°C; or use welding wire with tensile strength Rm≥690MPa , For fixed point butt welding and bottom welding, preheat to 150°C before welding; for continuous welding, the temperature between fill and cover welds should not be lower than 150°C and not higher than 200°C. The welded joint of the invention has relatively high strength, the weld seam has excellent crack resistance, and the joint has relatively high low-temperature impact toughness reserve and safety margin.

Description

technical field [0001] The invention belongs to the technical field of iron and steel material welding, and relates to a carbon dioxide gas shielded welding method for high-grade wear-resistant steel with a hardness level of HB500. Background technique [0002] With the accelerated construction of my country's infrastructure and the implementation of the western development strategy, the demand for wear-resistant steel in industries such as cement building materials, metallurgical mines, and engineering machinery has gradually increased, and the requirements for the strength and hardness of wear-resistant steel have also tended to be higher. High level, which is represented by high-grade wear-resistant steel with a hardness of HB500. With the increase of the grade of wear-resistant steel, the content of carbon element in the steel is also increased to 0.24% ~ 0.30%, and elements that can improve hardenability such as Cr, Mo, and B are added, and the hardening tendency is rela...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/16B23K9/23B23K35/30B23K103/04
Inventor 李丽尹雨群吴年春汪晶洁
Owner NANJING IRON & STEEL CO LTD
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