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Austenitic stainless steel gas shield welding wire for vehicle

A technology of austenitic stainless steel and gas shielding, applied in welding medium, welding equipment, welding/cutting medium/material, etc., can solve problems such as not being able to meet the development needs of new steel types, and achieve excellent welding process performance, welding arc Stable and beautifully formed effect

Active Publication Date: 2008-01-09
哈焊所华通(常州)焊业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no matching austenitic stainless steel gas-shielded welding wire in the current national standard. In the technical requirements of the original Ministry of Railways standard TB / T2374-1999, there are only several weather-resistant low-alloy steel gas-shielded welding wires. The commonly used WER44-8I, WER44- The strength level of 8II is 440MPa, which is far from meeting the development needs of high-grade new steel grades for railway speed increase and weight reduction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The welding wire is smelted by the supplier's steel plant resources, rolled and drawn into welding wire, and the surface is purified. The diameter of the welding wire is 1.2mm. The chemical composition (mass%) of its composition is: C: 0.027, Si: 0.85, Mn: 1.62 , P: 0.025, S: 0.013, Ni: 9.37, Cr: 20.1, and the rest are Fe and other inevitable inclusions. Using (Ar+2%CO 2 ) as shielding gas for deposition welding test, the welding current is 220-230A, the welding voltage is 28V, and the welding speed is 275mm / min. The interlayer temperature is 150±15°C. Weld metal yield strength Rel = 435MPa, tensile strength Rm = 562MPa, elongation A = 42%, reduction of area Z = 75%. The average impact energy of deposited metal Akv (-40 ℃) = 85J, Akv (-60 ℃) = 68J has excellent plasticity and low temperature impact toughness.

[0025] Butt welding test, plate TCS345 stainless steel plate thickness 6mm, single side 60°V-shaped groove, size is 300×150×6mm. The bottom plate of the T-sh...

Embodiment 2

[0035] The welding wire is smelted using the resources of the supplier's steel plant, rolled and drawn into a welding wire, and the surface is purified. The diameter of the welding wire is 1.2mm. The chemical composition (mass%) of its composition is: C: 0.023, Si: 0.84, Mn: 1.88, P: 0.025, S: 0.012, Ni: 13.21, Cr: 23.19, and the rest are Fe and other inevitable inclusions. Welding wire adopts (Ar+2%CO 2) as shielding gas for deposition welding test, welding process parameters are welding current 210-220A, welding voltage 27V, welding speed 260mm / min. The interlayer temperature is 150±15°C. Weld metal yield strength Rel = 442MPa, tensile strength Rm = 585MPa, elongation A = 39%, reduction of area Z = 72%. The average impact energy of deposited metal Akv (-40 ℃) = 79J, Akv (-60 ℃) = 65J has excellent plasticity and low temperature impact toughness.

[0036] Butt welding test, plate: TCS345 stainless steel plate welded with alloy steel plate Q450NQR1, thickness 6mm, single si...

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PUM

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Abstract

The present invention relates to austenitic stainless steel welding wire for gas protected welding in vehicle. The austenitic stainless steel welding wire has the chemical composition comprising C not more than 0.03 wt%, Si 0.50-0.90 wt%, Mn 1.00-2.50 wt%, P not more than 0.025 wt%, S not more than 0.015 wt%, Ni 9.0-14.0 wt%, Cr 19.5-24.5 wt%, and Fe and inevitable impurity for the rest. The austenitic stainless steel welding wire produced through smelting, rolling, drawing and other steps has excellent performance, including excellent welding performance, is applied for welding steel of 500-700 MPa strength to form weld seam with high strength, high toughness and high corrosion resistance.

Description

technical field [0001] The invention relates to an austenitic stainless steel gas shielded welding wire for vehicles. Background technique [0002] With the rapid development of my country's national economy, the transportation industry has entered a period of rapid development. In recent years, my country's railways have carried out six large-scale speed-ups, basically forming a "four vertical and two horizontal" speed-up network. In order to meet the requirements of railway speed increase and weight reduction, cross-sea bridges, military ships, oil pipelines, etc., the steel grades have high weather resistance, high strength, high toughness and require a strength level of 500-700MPa, so the performance of welded joints is also proposed. Higher requirements, welded joints must have the same toughness and weather resistance as the base material, and the strength level must reach 500-700MPa. The corresponding welding materials must also meet this requirement at the same tim...

Claims

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Application Information

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IPC IPC(8): B23K35/30
Inventor 李振华居晓锋
Owner 哈焊所华通(常州)焊业股份有限公司
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