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A kind of fluorine-free melting flux and its preparation method and application

A technology for melting flux and welding wire, which is applied in the field of fluorine-free melting flux and its preparation, and achieves the effects of low operator requirements, excellent performance and low cost

Active Publication Date: 2022-07-22
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The fluorine-free melting flux provided by the present invention does not contain CaF 2 , so there is no significant change in the composition during the preparation process that will affect the quality of the weld, and no harmful gases such as silicon tetrafluoride and titanium tetrafluoride will be produced during welding, which is conducive to protecting the environment and human health

Method used

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  • A kind of fluorine-free melting flux and its preparation method and application
  • A kind of fluorine-free melting flux and its preparation method and application
  • A kind of fluorine-free melting flux and its preparation method and application

Examples

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Embodiment 1

[0061] The fluorine-free smelting flux provided in this embodiment is made of the following components by mass percentage: SiO 2 24%, MnO 36% and TiO 2 40%.

[0062] The preparation method of the fluorine-free smelting flux provided by this embodiment includes the following steps:

[0063] (1) Weigh SiO according to the above ratio 2 , MnO and TiO 2 , mix it evenly, put it in a graphite crucible, smelt at 1500 ° C, and keep the temperature for 25 minutes to obtain a smelting material; perform water quenching on the smelting material to obtain a water-quenched material;

[0064] (2) placing the water-quenched material obtained in step (1) in a muffle furnace, and calcining at 700° C. for 2 hours to obtain a calcined material;

[0065] (3) Crushing and sieving the calcined material obtained in step (2) in turn to obtain a fluorine-free smelting flux with a particle size of 10 meshes to 120 meshes.

[0066] Then, the fluorine-free smelting flux prepared in the above steps w...

Embodiment 2

[0068] The fluorine-free smelting flux provided in this embodiment is made of the following components by mass percentage: SiO 2 28%, MnO 42% and TiO 2 30%.

[0069] The preparation method of the fluorine-free smelting flux provided in this embodiment is basically the same as that in Embodiment 1, except that: first, in step (1), the smelting temperature is 1450°C, and the smelting holding time is 30 minutes; second, the step In (2), the calcination temperature is 750°C and the time is 1h.

[0070] Then, the dried fluorine-free smelting flux prepared in the above steps is used for welding, and the welding parameters are exactly the same as those in Example 1.

Embodiment 3

[0072] The fluorine-free smelting flux provided in this embodiment is made of the following components by mass percentage: SiO 2 32%, MnO 48% and TiO 2 20%.

[0073] The preparation method of the fluorine-free smelting flux provided in this example is exactly the same as that in Example 2.

[0074] Then, the dried fluorine-free smelting flux prepared in the above steps is used for welding, and the welding parameters are exactly the same as those in Example 2.

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Abstract

The invention relates to the technical field of welding, in particular to a fluorine-free melting flux and a preparation method and application thereof. The fluorine-free smelting flux is made of the following components by mass percentage: SiO 2 20%~41%, MnO 30%~61% and TiO 2 15%~50%. The preparation method of the fluorine-free smelting flux includes: mixing the raw materials uniformly and then sequentially smelting and water quenching to obtain an intermediate material; and roasting the intermediate material to obtain the fluorine-free smelting flux. In the application of the fluorine-free smelting flux in the field of welding, the fluorine-free smelting flux is used in combination with a welding wire to weld structural steel for ships and marine engineering. The flux not only does not contain fluorine, but also avoids the addition of CaF in the prior art. 2 In addition, the flux can ensure that the welded joint obtained after welding has high mechanical properties.

Description

technical field [0001] The invention relates to the technical field of welding, in particular to a fluorine-free melting flux and a preparation method and application thereof. Background technique [0002] Flux, also known as flux, refers to a substance used to reduce the interfacial tension between the base metal and the solder except the base metal and the solder. Commonly used fluxes include the following: neutral flux, active flux, alloy flux, smelting flux and sintering flux. Among them, the melting flux has the advantages of uniform particle composition, not easy to absorb moisture, and recyclable. [0003] In the prior art, CaF is often added to the flux 2 , to adjust the alkalinity, reduce the oxygen content in the weld metal, and improve the arc stability during welding. However, since CaF 2 It is extremely volatile at higher temperatures (above 700°C), so it is difficult to control the composition of the flux during the preparation process, which will ultimatel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/362
CPCB23K35/362
Inventor 王聪马骏杰钟明王占军张燕云
Owner NORTHEASTERN UNIV LIAONING
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