High-fluorine low-zirconium type melting welding agent for ship and preparation method thereof

A technology for smelting flux and high fluorine, which is applied in the field of marine high-fluorine and low-zirconium smelting flux and its preparation, can solve the problems of difficult to obtain high-toughness weld metal, high diffusible hydrogen content and high activity of weld metal, and achieve good Uniform chemical composition, uniform weld metal composition, low moisture absorption effect

Inactive Publication Date: 2019-10-01
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing domestic marine fluxes have low alkalinity, high activity, and high content of diffused hydrogen in the weld metal. It is difficult to obtain high-toughness weld metal. When applied to high-speed welding with large input energy, undercutting and slag inclusions often occur Defects, can not be well adapted to large input energy welding, can not meet the needs of large-scale ship construction

Method used

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  • High-fluorine low-zirconium type melting welding agent for ship and preparation method thereof
  • High-fluorine low-zirconium type melting welding agent for ship and preparation method thereof
  • High-fluorine low-zirconium type melting welding agent for ship and preparation method thereof

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Effect test

Embodiment 1

[0038] A marine high-fluorine and low-zirconium melting flux, which contains the following components by mass percentage: CaF 2 : 97%, ZrO 2 :3%.

[0039] The preparation method of the marine high-fluorine and low-zirconium type smelting flux of the present invention comprises the following steps:

[0040] Step 1, smelting:

[0041] (1) According to the proportion of high-fluorine and low-zirconium melting flux for marine use, weigh the raw material CaF of each component 2 , ZrO 2 , put each raw material into the mixing equipment, and mix evenly by stirring;

[0042] (2) smelting the homogeneously mixed raw materials in a graphite crucible at 1540° C., and the smelting holding time is 15 minutes to obtain a smelted product;

[0043] (3) Quenching the smelted product with water to obtain a semi-finished product;

[0044] Step 2, high temperature roasting:

[0045] The semi-finished product was roasted at 800°C for 2 hours in a muffle furnace to obtain a roasted product, ...

Embodiment 2

[0050] A marine high-fluorine and low-zirconium melting flux, which contains the following components by mass percentage: CaF 2 : 95%, ZrO 2 :5%.

[0051] The preparation method of the marine high-fluorine and low-zirconium type smelting flux of the present invention comprises the following steps:

[0052] Step 1, smelting:

[0053] (1) According to the proportion of high-fluorine and low-zirconium melting flux for marine use, weigh the raw material CaF of each component 2 , ZrO 2 , put each raw material into the mixing equipment, and mix evenly by stirring;

[0054] (2) Melting the homogeneously mixed raw materials in a graphite crucible at 1520° C., the smelting holding time is 20 minutes, and the smelting product is obtained;

[0055] (3) Quenching the smelted product with water to obtain a semi-finished product;

[0056] Step 2, high temperature roasting:

[0057] The semi-finished product was roasted at 800°C for 2 hours in a muffle furnace to obtain a roasted prod...

Embodiment 3

[0062] A marine high-fluorine and low-zirconium melting flux, which contains the following components by mass percentage: CaF 2 : 96%, ZrO 2 :4%.

[0063] The preparation method of the marine high-fluorine and low-zirconium type smelting flux of the present invention comprises the following steps:

[0064] Step 1, smelting:

[0065] (1) According to the proportion of high-fluorine and low-zirconium melting flux for marine use, weigh the raw material CaF of each component 2 , ZrO 2 , put each raw material into the mixing equipment, and mix evenly by stirring;

[0066] (2) Melting the homogeneously mixed raw materials in a graphite crucible at 1560° C., and the smelting holding time is 10 minutes to obtain a smelted product;

[0067] (3) Quenching the smelted product with water to obtain a semi-finished product;

[0068] Step 2, high temperature roasting:

[0069] The semi-finished product was roasted at 800°C for 2 hours in a muffle furnace to obtain a roasted product, a...

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Abstract

The invention provides a high-fluorine low-zirconium type melting welding agent for a ship and a preparation method thereof. The welding agent comprises the following components in percentage by mass:93-97% of CaF2, and 3-7% of ZrO. The preparation method comprises the steps of melting at special temperature under corresponding raw material mixing ratio; roasting for 2-3h under the temperature of700-800 DEG C; and crushing and screening the roasted product to obtain particles with particle size of 10-40 meshes, and thus obtaining the high-fluorine low-zirconium type melting welding agent forthe ship. After welding through the melting type welding agent, the tensile strength of a formed welding joint is 655-710MPa; the vickers hardness is 235-265Hv; the impact energy under the temperature of -40 DEG C is 65-75J; and the melting welding agent is high in mechanical performance.

Description

technical field [0001] The invention belongs to the technical field of welding, in particular to a marine high-fluorine and low-zirconium melting flux and a preparation method thereof. Background technique [0002] Submerged arc welding has the advantages of high production efficiency, high degree of mechanization, good and stable welding quality, and has been widely used in shipbuilding and other fields. Submerged arc welding flux is one of the main consumable materials of submerged arc welding. During the welding process, it plays a role in mechanical protection, metallurgical treatment and improvement of welding process performance for the weld metal. Important factor in metal quality. The existing domestic marine fluxes have low alkalinity, high activity, and high content of diffused hydrogen in the weld metal. It is difficult to obtain high-toughness weld metal. When applied to high-speed welding with large input energy, undercutting and slag inclusions often occur De...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/362B23K35/40
CPCB23K35/362B23K35/40
Inventor 王聪杨佳坤张进高俊烽
Owner NORTHEASTERN UNIV LIAONING
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