Steel gas protection welding wire for railway vehicle welding

A gas-shielded welding wire and railway vehicle technology, applied in the field of metallurgy, can solve the problems of uneven diffusion of chemical components, decreased fluidity of the weld pool, increase of viscosity of the weld pool, etc., to solve the problem of mismatching strength and toughness, arc Steady, over-uniform effect of combustion

Inactive Publication Date: 2017-11-17
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The patent document with the publication number CN 105643139 A discloses a solid welding wire for high-strength weather-resistant steel. In steelmaking, the content of harmful elements P and S is controlled, and the S content is ≦0.020%. The problem of reduced fluidity of the molten pool will lead to uneven diffusion of chemical components, resulting in weld segregation, and then hot cracks; if the S element in the welding wire is too low, the viscosity of the weld pool will increase, the weld will not be smooth, and the weld The seam becomes flocculent, which will slow down the escape of hydrogen, nitrogen, carbon dioxide and other gases in the weld, resulting in pores and slag inclusions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 120t converter is used to smelt molten steel to produce 150*150mm billet by continuous casting machine, which is rolled into φ5.5mm welding wire wire rod by high-speed rolling mill, and then φ1.2mm gas shielded welding wire is made by wire drawing, copper plating and other processes. The chemical composition of welding wire (mass percentage) is: C 0.05%, Si 0.40%, Mn 1.45%, P 0.015%, S 0.006%, Cr 0.22%, Ni0.30%, Cu 0.21%, the balance is iron, and unavoidable impurities.

[0037] The experimental base material is Q420NQR1 railway vehicle steel with a thickness of 15mm. The yield strength is 506MPa, the tensile strength is 612MPa, the elongation is 22%, and the impact energy at -40°C is 218J. The welding groove is oblique Y-shaped, and the angle is 60°C , Welding voltage is 24±2V, multi-pass multi-layer welding, welding speed 150±10mm / min, placed for 48 hours after welding, ultrasonic flaw detection, no defects were found.

[0038] Metallographic observation shows that: t...

Embodiment 2

[0040] 120t converter is used to smelt molten steel to produce 150*150mm billet by continuous casting machine, which is rolled into φ5.5mm welding wire wire rod by high-speed rolling mill, and then φ1.2mm gas shielded welding wire is made by wire drawing, copper plating and other processes. The chemical composition of welding wire (Mass percentage) is: C 0.09%, Si 0.55%, Mn 1.45%, P 0.015%, S 0.004%, Cr 0.27%, Ni0.35%, Cu 0.19%, the balance is iron, and unavoidable impurities.

[0041] The experimental base material is 30mm thick Q420NQR1 steel for railway vehicles, with a yield strength of 512MPa, a tensile strength of 610Pa, an elongation of 23%, an impact energy of -40°C of 207J, and a welding bevel with an oblique Y shape at an angle of 60°C , Welding voltage is 24±2V, multi-pass multi-layer welding, welding speed 150±10mm / min, placed for 48 hours after welding, ultrasonic flaw detection, no defects were found.

[0042] The metallographic observation shows that the metallo...

Embodiment 3

[0044] 120t converter is used to smelt molten steel to produce 150*150mm billet by continuous casting machine, which is rolled into φ5.5mm welding wire wire rod by high-speed rolling mill, and then φ1.2mm gas shielded welding wire is made by wire drawing, copper plating and other processes. The chemical composition of welding wire (mass percentage) is: C 0.08%, Si 0.65%, Mn 1.55%, P 0.015%, S 0.006%, Cr 0.25%, Ni0.30%, Cu 0.22%, the balance is iron, and unavoidable impurities.

[0045] The experimental base material is Q420NQR1 railway vehicle steel with a thickness of 25mm. Its yield strength is 506MPa, tensile strength is 618Pa, elongation is 22%, impact energy at -40°C is 212J, and the welding groove is oblique Y-shaped, with an angle of 60°C , Welding voltage is 24±2V, multi-pass multi-layer welding, welding speed 150±10mm / min, placed for 48 hours after welding, ultrasonic flaw detection, no defects were found.

[0046] The metallographic observation shows that the metallo...

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Abstract

The invention discloses a steel gas protection welding wire for railway vehicle welding. The steel gas protection welding wire comprises chemical components, by mass, of 0.04-0.10% of C, 0.35-0.65% of Si, 1.30-1.60% of Mn, 0.020% or less of P, 0.010% or less of S, 0.20-0.50% of Cr, 0.30-0.80% of Ni, 0.19-0.40% of Cu and the balance Fe and inevitable impurities. According to the steel gas protection welding wire, the comprehensive property is good, the tensile strength is 620 MPa or over, impact energy of minus 40 DEG C is 124 J or over, and the anti-corrosion property is outstanding.

Description

technical field [0001] The invention relates to a metallurgical technology, in particular to a steel gas shielded welding wire for welding railway vehicles. Background technique [0002] At present, the annual consumption of newly-built railway vehicles in my country is about 200,000 tons, and the steel used for vehicles should focus on solving the problems of high strength, high corrosion resistance, high welding performance and light weight. The application of this kind of steel plate is naturally inseparable from the matching of welding wire for welding. [0003] On the one hand, the supporting welding wire needs to meet the mechanical performance requirements, on the other hand, the welded joint should have the same weather resistance as the base metal. In order to meet the environmental needs of cold regions, it should also ensure that the weld and heat-affected zone have good low-temperature impact toughness. [0004] The patent document with the publication number C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/22
Inventor 董捷
Owner INNER MONGOLIA BAOTOU STEEL UNION
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