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A kind of melting flux for welding hsla steel and preparation method thereof

A technology for smelting flux and post-welding, which is applied in the field of smelting flux for welding HSLA steel and its preparation, which can solve the problems of pores in the weld metal, decrease in the mechanical properties of the weld, and increase the brittleness of the weld metal. Uniform texture, good weld formability, and good storability

Active Publication Date: 2022-02-22
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in the prior art, due to the decomposition of oxides in the flux, free oxygen and oxygen will be formed. If the gas such as oxygen and CO formed by decarburization reaction cannot be discharged in time in the weld, it will cause the formation of pores, and the free oxygen will increase. The brittleness of the weld metal will lead to defects such as pores and cracks in the weld metal, and the increase in brittleness will lead to a decrease in the mechanical properties of the weld

Method used

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  • A kind of melting flux for welding hsla steel and preparation method thereof
  • A kind of melting flux for welding hsla steel and preparation method thereof
  • A kind of melting flux for welding hsla steel and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0064] The smelting flux provided by this embodiment consists of the following components in terms of mass percentage: CaF 2 59%, ZrO 2 20% and SiO 2 twenty one%.

[0065] The preparation method of the molten flux provided in this embodiment comprises the following steps:

[0066] (1), 590gCaF 2 , 200gZrO 2 and 210gSiO 2 Put it into the mixing equipment and stir to make it evenly mixed; then put the evenly mixed mixed material in a graphite crucible and melt it at a temperature of 1600°C for 30 minutes to obtain a smelted product; then water quench the smelted product to obtain a glass state mixture;

[0067] (2) Put the glassy mixture in a muffle furnace and bake it at 850°C for 4 hours to remove impurities such as carbon powder in the smelted flux; then crush and sieve the product obtained after roasting to obtain The particle size is 10~100 mesh melting flux.

[0068] The smelting flux prepared in Example 1 was dried in a drying oven at a temperature of 300° C. fo...

Embodiment 2

[0070] The smelting flux provided by this embodiment consists of the following components in terms of mass percentage: CaF 2 60%, ZrO 2 20% and SiO 2 20%.

[0071] The preparation method of the molten flux provided in this embodiment comprises the following steps:

[0072] (1), 600gCaF 2 , 200gZrO 2 and 200gSiO 2 Put it into the mixing equipment and stir to make it evenly mixed; then put the evenly mixed mixed material in a graphite crucible and melt it at a temperature of 1630°C for 25 minutes to obtain a smelted product; then water quench the smelted product to obtain a glass state mixture;

[0073] (2) Put the glassy mixture in a muffle furnace and bake it at 800°C for 4 hours to remove impurities such as carbon powder in the melting flux; then crush and sieve the product obtained after roasting to obtain The particle size is 10~100 mesh melting flux.

[0074] The smelting flux prepared in Example 2 was dried in a drying oven at a temperature of 350° C. for 2 hour...

Embodiment 3

[0076] The smelting flux provided by this embodiment consists of the following components in terms of mass percentage: CaF 2 61%, ZrO 2 20% and SiO 2 19%.

[0077] The preparation method of the molten flux provided in this embodiment comprises the following steps:

[0078] (1), 610gCaF 2 , 200gZrO 2 and 190gSiO 2 Put it into the mixing equipment and stir to make it evenly mixed; then put the evenly mixed mixed material in a graphite crucible and melt it at a temperature of 1660°C for 30 minutes to obtain a smelted product; then water quench the smelted product to obtain a glass state mixture;

[0079] (2) Put the glass mixture in a muffle furnace and bake it at 900°C for 3.5 hours to remove impurities such as carbon powder in the melting flux; then crush and sieve the product obtained after roasting, The smelting flux with a particle size of 10-100 mesh is obtained.

[0080]The smelted flux prepared in Example 3 was dried in a drying oven at a temperature of 330° C. ...

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Abstract

The invention relates to the field of welding technology, in particular to a smelting flux for welding HSLA steel and a preparation method thereof. The melting flux used for welding HSLA steel includes the following components in terms of mass percentage: CaF 2 50%~65%, ZrO 2 18%~28% and SiO 2 17%~23%; the welding method is submerged arc welding. The melting flux is improved by adding a higher content of ZrO 2 , and with CaF 2 and SiO 2 Synergistic effect, used for welding specific types of steel, not only makes the weld have good low temperature toughness, tensile strength and slag removal performance, but also has excellent arc stability and weld formability, the welding process is stable, and the obtained after welding The metal composition and structure of the weld are uniform, the surface morphology is good, and there are no defects such as pores and cracks.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a smelting flux for welding HSLA steel and a preparation method thereof. Background technique [0002] Submerged arc welding flux plays an important role in submerged arc welding. Submerged arc welding flux is one of the main consumable materials in the process of large input energy welding. It can not only protect the weld metal from oxidation, but also pass through the alloy The transition to the transition of beneficial metal elements in the weld, thereby improving the mechanical properties of the weld metal. Flux mainly includes bonding flux, sintering flux and melting flux. Among them, the smelting flux has the advantages of uniform particle composition, screening out old powder without affecting the flux composition, no moisture absorption, and the recycling system can be used to recover unmelted flux for recycling. [0003] However, in the prior art, due to the decompos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/362B23K9/18
CPCB23K35/3605B23K35/362B23K35/0255B23K9/18
Inventor 王聪陈昂然王占军钟明张进
Owner NORTHEASTERN UNIV LIAONING
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