Exothermic welding flux and application thereof

An aluminothermic and aluminum powder technology, applied in the field of flux, can solve the problem of undisclosed weld hardness transition, and achieve the effects of reducing the possibility of white spots and micro-cracks, small hardness difference, and good transition.

Active Publication Date: 2016-09-07
张绵胜 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent can guarantee that the welded seam is bainitic, but it does not disclose the problem of the hardness transition of the weld seam

Method used

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  • Exothermic welding flux and application thereof
  • Exothermic welding flux and application thereof
  • Exothermic welding flux and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1 Use of bainitic steel in homogeneous rail welding.

[0045] Bainitic steel welded joints are bainite at both ends.

[0046] The thermite flux provided in this embodiment, the mass percentages of each component are as follows:

[0047] Table 1. Embodiment 1 thermite soldering flux formula

[0048] components

Content (mass percent %)

C

0.10

Si

1.0

mn

2.3

Cr

0.7

Ni

1.2

Mo

0.2

V

0.03

Aluminum powder

18.2

iron oxide

60

iron powder

margin

[0049] The particle size of each component is 10-80 mesh.

[0050] The thermite flux provided in this embodiment is used to weld two bainitic steel welded joints.

[0051]The welding process and weldment requirements in this embodiment are implemented in accordance with the standards TBT1632.3-2005 and TBT1632.1-2005. Unless otherwise specified, the following data are all obtained from the 75kg / m rail test.

Embodiment 2

[0052] Example 2 The use of bainitic steel and pearlitic steel in welding heterogeneous rails

[0053] The two ends of the welded joint are respectively bainite steel and pearlitic steel.

[0054] Table 2. Embodiment 2 thermite soldering flux formula

[0055]

[0056]

[0057] The particle size of each component is 10-80 mesh.

[0058] Use the thermite flux provided in this example to weld the two welded joints. One of them is a welded joint of bainitic steel (denoted as welded joint 1), and the other is a welded joint of pearlitic steel (denoted as welded joint 2).

[0059] The welding process and weldment requirements in this embodiment are implemented in accordance with the standards TBT1632.3-2005 and TBT1632.1-2005. Unless otherwise specified, the following data are all obtained from the 75kg / m rail test.

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Abstract

The invention discloses exothermic welding flux. The exothermic welding flux comprises iron powder, iron oxide and an alloy additive. The alloy additive comprises C, Si, Mn, Cr, Ni, Mo, V and aluminum powder. The exothermic welding flux comprises, by mass percent, 0.10%-0.25% of C, 1.0%-1.6% of Si, 1.8%-3% of Mn, 0.5%-1.0% of Cr, 0.3%-1.2% of Ni, 0.2%-0.6% of Mo, 0.03%-0.1% of V, 17.8%-19.2% of aluminum powder, 60%-67% of iron oxide and the balance iron powder. The invention further provides application of the exothermic welding flux to steel rail welding.

Description

technical field [0001] The invention relates to the field of flux technology, in particular to a thermite flux and the application of the armite flux in a rail welding process. Background technique [0002] Continuous welded rail is a long rail line formed by welding standard length rails, also known as welded long rail line. Compared with ordinary lines, seamless lines eliminate rail gaps in long-distance rail laying sections, thereby eliminating the impact of wheels on rail joints, making trains run smoothly, passengers comfortable, and extending the service life of line equipment and rolling stock , reducing the workload of line maintenance and repair. When the vehicle passes the turnout, if the turnout is connected by welding, the impact of the wheel on the turnout components is greatly reduced, and the service life of the turnout is improved. Especially in high-speed rail lines, the bolted form is basically eliminated. According to the statistics of relevant departme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K23/00B23K35/34
CPCB23K23/00B23K35/34
Inventor 张绵胜
Owner 张绵胜
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