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Weather resistance steel argon-rich gas shielded welding wire for high-intensity railway vehicle

A technology for gas shielded welding wire and railway vehicles, which is applied in welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems of unsatisfactory weather resistance and high cost of gas shielded welding wire, and achieve high weather resistance, beautiful shape, Good matching effect

Inactive Publication Date: 2009-02-04
HUBEI KMK WELDING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention mainly solves the technical problems of the existing gas-shielded welding wire, such as the unsatisfactory weather resistance and high cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: A 200KG vacuum induction furnace is used to smelt steel for welding wire, and then a welding wire with a diameter of 1.18mm is produced through processes such as rolling, wire drawing, copper plating on the surface, and winding. The main chemical composition (mass percentage) of the welding wire is Cu 0.25%, Cr0.65%, Ni0.41%, C 0.08%, Si0.45%, Mn1.40%, P0.011%, S0.008%, more than The amount is iron and other unavoidable impurities.

[0016] Argon-rich gas (80% Ar+20% CO2) was used as shielding gas, and the above-mentioned welding wire was used for welding experiments. The welding current was 260-280A, the welding voltage was 32V, and the welding speed was 23.8cm / min. The mechanical properties of the obtained deposited metal are: tensile strength Rm=675MPa, yield strength Rcl=545MPa, elongation after fracture A=26%, impact energy (-40°C) Axv=172J of the deposited metal.

Embodiment 2

[0017] Embodiment 2: A 200KG vacuum induction furnace is used to smelt the steel for welding wire, and then a welding wire with a diameter of 1.18 mm is produced through processes such as rolling, wire drawing, copper plating on the surface, and winding. The main chemical composition (mass percentage) of the welding wire is Cu 0.22%, Cr0.36%, Ni0.26%, C 0.067%, Si0.33%, Mn1.31%, P=0.011%, S=0.011%, balance For iron and other unavoidable impurities.

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Abstract

The invention discloses an argon-rich gas-shielded welding wire of high-strength weathering steel used in railway cars, which is prepared by the following chemical components according to mass percentage: 0.2-0.35 percent of Cu, 0.3-0.7 percent of Cr, 0.2-to 0.6 percent of Ni, 0.05-0.1 percent of C, 0.3-0.5 percent of Si, 1.2-1.45 percent of Mn, P which is less than or equal to 0.015 percent, S which is less than or equal to 0.015 percent, the rest of Fe and unavoidable impurities. The welding wire is characterized by high weatherability, high strength, good flexibility, good resistance to welding cold crack, and the like, and the tensile strength thereof is more than 600MPa and the low-temperature impact property Axv is equal to or more than 146J at minus 40 DEG C. The welding wire adopts argon-rich gas as shield gas and has stabilized arcs, little splash, no air hole and good welding appearance when in welding. Furthermore, weld joints have an excellent matching effect with the high-strength weathering wheel used in the railway cars.

Description

technical field [0001] The invention relates to a welding wire, in particular to a weather-resistant steel argon-rich gas shielded welding wire for high-strength railway vehicles. Background technique [0002] Locomotives are used in different regions, climates and seasons all year round. More importantly, the speed of railway locomotives has been quite high after many times of railway speed-up in my country, and the load on locomotives has also increased relatively. In order to allow railway locomotives to withstand the above harsh conditions, high-strength, Light weight and very good weather resistance (that is, atmospheric corrosion resistance) are used as steel for locomotives. Thus, the welding of the above-mentioned steels requires a welding wire that closely matches this performance. However, looking at the existing welding materials, it is rare to find professional argon-enriched gas shielded welding wire with high quality and low cost. Chinese patent CN101020279 d...

Claims

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Application Information

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IPC IPC(8): B23K35/30
Inventor 李志远曲朝霞
Owner HUBEI KMK WELDING MATERIALS
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