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High-strength and high-toughness automatic submerged arc welding wire with weathering resistance

A submerged arc automatic welding, high-strength technology, applied in the direction of welding medium, manufacturing tools, welding equipment, etc., can solve the problems of large gap in weld toughness, insufficient matching requirements, high production cost, etc., and achieve good atmospheric corrosion resistance, Excellent joint performance, high strength and toughness effect

Inactive Publication Date: 2009-09-23
武钢集团有限公司
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AI Technical Summary

Problems solved by technology

There is no weather-resistant steel submerged arc welding wire in the existing national standard for welding wire. The technical requirement of the original Ministry of Railways standard TB / T2374-1999 is that the strength level of submerged arc welding wire WER44-8(III) is 440MPa, which is far from enough to meet the requirements of railway speed-up, weight-reduction, cross-span Supporting demand for welding materials for high-grade new steel key projects such as sea bridges, ocean ships, oil pipelines, and construction machinery
With the continuous improvement of the strength, toughness and weather resistance of high-grade new steel types, the weld toughness and weather resistance are far behind the base material. A large number of high-strength weather-resistant series welding materials are imported every year, which cannot meet the needs of key domestic projects.
Chinese patent 00114334.4, its alloy system is Ni-Mo-Ti, although it meets the needs of high tensile strength level 600-700MPa, but the disadvantage is that it is only suitable for the welding of low-alloy steel plates for pressure vessels, especially does not have weather resistance, And because it contains Mo, its current price is very expensive, making the production cost higher
Chinese patent 97104393.0, its alloy system is Ni-Ti-B, which is suitable for welding with large input energy, and has strong adaptability to welding grooves, but its disadvantage is that it still does not have weather resistance, and is not suitable for railway speed-up in my country Weight reduction, cross-sea bridges, construction machinery, petrochemicals, marine ships and other industries need to match the weather-resistant submerged arc welding materials for weather-resistant series steel grades developed for atmospheric corrosion resistance, and there is an urgent need to develop a new generation of high-weather-resistant High strength and high toughness submerged arc automatic welding wire

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The welding wire was smelted in a 0.5-ton electric furnace, rolled and drawn into a welding wire with a diameter of 4 mm and copper-plated surface. The composition of the finished product is: C: 0.06, Si: 0.041, Mn: 1.68, Ni: 0.43, Cr: 0.26, Ti: 0.10, Cu: 0.26, B: 0.0057, Als: 0.009. The rest is Fe and other unavoidable inclusions. Welding metal welding test was carried out using CHF101 flux matching, the welding current was 600A, the welding voltage was 31V, and the welding speed was 35cm / min. Interlayer temperature ≤150°C. Weld metal yield strength ReL = 425MPa, tensile strength Rm = 560MPa, elongation A = 26%, reduction of area Z = 75%. The average impact energy of the weld deposited metal is Akv(20°C)=147J, Akv(-40°C)=107J, Akv(-50°C)=87J, and the weld has excellent strength-toughness matching and low-temperature impact toughness. Meet the supporting welding technical requirements of a new generation of economical high weather resistance steel.

Embodiment 2

[0034]The welding wire was smelted in a 0.5-ton electric furnace, rolled and drawn into a welding wire with a diameter of 4 mm and copper-plated surface. The weight composition of the finished product is: C: 0.07, Si: 0.040, Mn: 1.60, Ni: 0.41, Cr: 0.30, Ti: 0.12, Cu: 0.29, B: 0.006, Als: 0.005. The rest is Fe and other unavoidable inclusions. The welding wire is matched with the CHF101 flux produced by Atlantic Welding Products Co., Ltd. to weld the 20mm thick new generation offshore platform steel WNHS315. The chemical composition of the steel (by weight %) mainly contains C: 0.061, Si: 0.28, Mn: 1.37, Nb: 0.047, Mo: 0.27, P: 0.008, S: 0.005. Rm=510MPa, ReL=316MPa, Akv(-0°C)=268J. The welding process is Y-shaped groove. The blunt edge of the groove is 6mm, the angle of the groove is 35° on one side, the welding process parameters are welding current 650A, welding voltage 31V, and welding speed 35cm / min. The tensile strength of the joint Rm = 505MPa, cold bending d = 3a, ...

Embodiment 3

[0036] The welding wire was smelted in a 0.5-ton electric furnace, rolled and drawn into a welding wire with a diameter of 4 mm and copper-plated surface. The weight chemical composition of its welding wire is: C: 0.09, Si: 0.060, Mn: 1.90, Ni: 0.41, Cr: 0.35, Ti: 0.15, Cu: 0.35, B: 0.009, Als: 0.012. The rest is Fe and other unavoidable inclusions. The welding wire is matched with CHF101 flux, welding 20mm thick offshore platform steel E36, weight chemical composition: C: 0.12, Si: 0.28, Mn: 1.48, Ni(Nb): 0.020, Mo: 0.036, P: 0.008, S: 0.005. Rm=535MPa, ReL=360MPa, Akv(-0°C)=96J. Welding process is identical with embodiment 2. The tensile strength of the joint Rm = 520MPa, cold bending d = 3a, 180° qualified. Welding seam impact energy Akv (0°C) = 144J, Akv (-20°C) = 73J, fusion line impact energy Akv (0°C) = 88J, Akv (-20°C) = 100J, hot shadow zone impact energy Akv (0 ℃) = 95J, Akv (-20 ℃) ​​= 63J, the impact energy of the three zones of the joint has reached a relative...

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Abstract

The invention relates to a high-strength and high-toughness automatic submerged arc welding wire with weathering resistance and mainly aims at overcoming disadvantages of poor atmospheric corrosion resistance, high production cost and the like of the existing submerged arc welding materials. In term of technical measures, the welding wire is made from the following chemical components by weight percent: C: 0.05-0.12, Si: 0.01-0.10, Mn: 1.50-2.1. S: not more than 0.015, P: not more than 0.020, Ni: 0.20-0.60, Cr: 0.20-0.50, Cu: 0.25-0.50, Ti: 0.05-0.16, B: 0.002-0.010, Als: 0.001-0.015, Fe and other unavoidable impurities. The welding wire is matched with a basic sintered flux for welding, a weld joint has excellent atmospheric corrosion resistance and comprehensive mechanical properties, and a deposited metal at a weld seam has tensile strength up to 560MPa and ballistic work up to 107J at -40 DEG C and up to 87J at -50 DEG C.

Description

technical field [0001] The invention relates to a submerged arc automatic welding wire material for welding metal materials, in particular to a submerged arc automatic welding wire suitable for welding high-strength, high-toughness steel grades with high weather resistance requirements. Background technique [0002] With the rapid development of my country's national economy, the railway transportation industry has entered a period of rapid development. In recent years, six large-scale speed-ups have been carried out on railway lines, and a "four vertical and two horizontal" speed-up network has been preliminarily formed. In order to further meet the requirements of the Ministry of Railways for speed-up and weight-reduction and welding materials for new steel key projects such as cross-sea bridges, ocean ships, oil pipelines, and construction machinery, a new generation of welding structures with high weather resistance, high strength, and high toughness will be generally us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/40
Inventor 缪凯黄治军胡因洪刘吉斌王玉涛牟文广曹修悌
Owner 武钢集团有限公司
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