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Welding rod for bainite steel arc welding

A bainitic steel, arc welding technology, applied in welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problem of no arc welding rod, etc., and achieve the effect of prolonging service life and stable quality

Active Publication Date: 2020-08-28
BEIJING TEYE IND & TRADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no arc welding electrode for this kind of rail in the market. Therefore, under the support and guidance of the Metallurgical Institute of the Academy of Railway Sciences and the Welding Institute of the Iron and Steel Research Institute, we began to study bainitic steel electrodes. After years of research, testing and Verification, obtain welding and repairing success in Jingshan, Beijing-Guangzhou, Beijing-Shanghai and other main trunk lines, obtain the present invention

Method used

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  • Welding rod for bainite steel arc welding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1 Welding repair to U20Mn2SiCrNiMo bainitic steel frog

[0012] U20Mn2SiCrNiMo bainitic steel frog Rm is 1280MPa, R p0.2 1000MPa, A≥9%, Z is 14.7%, normal temperature a k It is 68.7J, the heat treatment state is hot rolling and air cooling, and the microstructure is bainite.

[0013] Electrode, diameter 3.2mm, welding core adopts U20Mn2SiCrNiMo steel rail to roll into bar, coating composition (wt%) is Al 2 o 3 1.0, CaO 50.0, Cl 0.03, Cr 2 o 3 0.03, F 13.0, Fe 2 o 3 4.0,K 2 O 3.8, MgO 1.5, MnO 1.25, Na 2 O 4.2, Nb 2 o 5 0.04, SiO 2 14.28, SrO 0.02, TiO 2 6.8 and ZrO 0.05.

[0014] The welding voltage is 24V, the welding current is 120A, the welding speed is 3mm / s, and the interlayer temperature is 120°C.

[0015] Electrode deposited metal chemical composition: Si 1.5-2.5, Mn 1.5-2.5, Cr 0.6-2.0, Ni 0.5-1.0, Mo0.36, Al 0.004, S 0.003, P 0.019.

[0016] Mechanical properties of deposited metal: Rm is 1260MPa, R p0.2 is 953MPa, A8%, Z is 12%...

Embodiment 2U20

[0022] Example 2 U20Mn2SiCrNiMo Rail Frog Top Surface Welding Repair

[0023] Welding rod: In order to ensure the consistency of components, the welding core of the present invention adopts the welding rod rod drawn after cutting U20Mn2SiCrNiMo rail. The skin composition is Al 2 o 3 0.88, CaO 55.08, Cl 0.027, Cr 2 o 3 0.025, F 9.13, Fe 2 o 3 5.86,K 2 O 4.08, MgO 1.04, MnO 1.28, Na 2 O 4.28, Nb 2 o 5 0.046, SiO 2 14.59, SrO 0.026, TiO 2 3.4 and ZrO 0.062, CuO 0.017, Nd 2 o 3 0.068,P 2 o 5 0.011, SO 3 0.081.

[0024] Hudong Station 15# fork No. 12349 of the Datong section of Daqin Line, 75kg-1 2# heart straight wing rail crushed and broken, welding length straight wing rail 410*37*7mm, heart rail 210mm deep 5mm, in 2013 It was welded on July 18. After welding, the service life of this part is the same as that of the wing rail.

Embodiment 3

[0025] Embodiment 3 Welding repair to U20Mn2SiCrNiMo bainitic steel frog

[0026] The welding core is made of U20Mn2SiCrNiMo bainite steel rail and rolled into bars, and the composition of the coating is Al 2 o 3 1.68, CaO48.5, Cl 0.037, Cr 2 o 3 0.32, F 13.24, Fe 2 o 3 3.39,K 2 O 2.6, MgO 1.72, MnO 1.1, Na 2 O 4.38, Nb 2 o 5 0.041, SiO 2 14.05, SrO 0.014, TiO 2 8.51, ZnO 0.031, ZrO 0.03, MoO3 0.20, P 0.0096, S 0.15.

[0027] The mechanical properties of U20Mn2SiCrNiMo bainite rail frogs are: Rm is 1280MPa, A≥10%, R p0.2 ≥1000MPa, elongation after fracture Z≥12%, room temperature impact energy ak≥70J, tread hardness 360-430HBW, heat treatment state is hot rolling and air cooling, microstructure is bainite and martensite multiphase structure.

[0028] Welding voltage: 24V, welding current: 120A, welding speed 3mm / s, interlayer temperature 120°C.

[0029] The mechanical properties of the deposited metal after welding are: Rm 1210MPa, Rp0.2 980MPa, A 9.0%, Z 11...

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Abstract

The invention discloses a welding rod for bainite steel arc welding. The welding rod is composed of a core wire and a coating on the surface, the core wire is a welding stick formed by pulling a to-be-welded bainite steel rail, and the coating mainly comprises the components, in percentage by weight, of 0.8%-1.8% of Al2O3, 46.0%-56.0% of CaO, 0.02%-0.04% of Cl, 0.02%-0.04% of Cr2O3, 9.0%-14.0% ofF, 3.0%-6.0% of Fe2O3, 2.5%-4.3% of K2O, 1.0%-2.0% of MgO, 1.0%-1.5% of MnO, 4.1%-4.5% of Na2O, 0.038%-0.05% of Nb2O5, 13.9%-15.0% of SiO2, 0.01%-0.03% of SrO, 3.0%-9.0% of TiO2 and 0.02%-0.08% of ZrO. The welding rod is used for repairing bainite steel rails and turnouts, the hardness and the abrasion resistance of the welding rod are equivalent to the hardness and the abrasion resistance of basemetal after welding, and the service life of products can be effectively prolonged.

Description

technical field [0001] The invention relates to a welding rod for arc welding, in particular to a welding rod for bainite rail welding. Background technique [0002] The turnout is one of the three weak links of the track line structure. The frog of the turnout is the weak link of the turnout because of the harmful space, and is the weak link of the track structure. The diseases caused by the rolling and impact of the locomotive during use are mainly wear and cracks, and the remediation methods are grinding and welding. Especially wear and tear and cracks must be repaired after grinding before they can be used normally. [0003] The welding repair of frogs is mainly electric welding, and the requirements are extremely strict. The mechanical properties of the welding meat are required to be the same material and performance as frogs. However, the operating environment of welding repair is completely different from the production environment and conditions of rails. It is qu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/362B23K35/36
CPCB23K35/30B23K35/362B23K35/36B23K35/3053B23K35/3601
Inventor 张绵胜张志勇张志强
Owner BEIJING TEYE IND & TRADE