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Zinc-based brazing filler metal powder for brazing coating of galvanized sheet along with welding

A technology of galvanized sheet and brazing filler metal, applied in the direction of welding/cutting medium/material, welding equipment, welding medium, etc., can solve the problems of corrosion resistance decline, production efficiency decline, zinc coating evaporation and oxidation, etc., and achieve good Oxidation resistance, improvement of production efficiency, effect of eliminating recoating process

Pending Publication Date: 2021-12-14
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the boiling point and vapor pressure of the coating are relatively low, and the zinc coating near the weld will inevitably evaporate and oxidize at a higher temperature during the welding process.
Therefore, after welding, the position near the weld, especially the welding toe, will lose the protection of the zinc layer, resulting in a decrease in corrosion resistance, and it will become a shortcoming of the corrosion resistance of the overall structure.
At present, a commonly used method is to use cold-sprayed zinc coating to re-coat the zinc layer after welding, but this technology needs to be polished after the weld is completely cooled, which increases the process and increases the cost and production efficiency. Decline

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The composition of the zinc-based solder powder is: aluminum powder 5wt%, copper powder 3wt%, tin powder 15wt%, rare earth metal 0.1wt%, and the balance is zinc powder.

[0019] The preparation method is that the raw metal powder is ball-milled by a planetary high-energy ball mill to realize mechanical alloying. The ball milling speed is 400r / min, and the ball milling time is 1h. The whole process is protected by argon gas, and the ball mill tank is vacuumized and filled with argon gas repeatedly 3 times before ball milling.

[0020] When in use, take 90 parts of the brazing material alloy powder and 10 parts of the brazing flux powder, mix them thoroughly with alcohol, dry and grind them into powder again before using. The components of flux powder used are LiCl 41%, KCl 50%, ZnCl 2 3.0%, CuCl 2 1.5%, LiF 1.4%, NaF 0.4%, KF 2.7%, melting point is about 350°C.

[0021] The above-mentioned solder-flux mixed powder is used for the brazing coating of the 2mm thick gal...

Embodiment 2

[0025] The composition of the zinc-based solder powder is: 10wt% of aluminum powder, 5wt% of copper powder, 10wt% of tin powder, 0.03wt% of rare earth metal, and the balance is zinc powder.

[0026] The preparation method is that the raw metal powder is ball-milled by a planetary high-energy ball mill to realize mechanical alloying. The ball milling speed is 500r / min, and the ball milling time is 1h. The whole process is protected by argon gas, and the ball mill tank is vacuumized and filled with argon gas repeatedly 3 times before ball milling.

[0027] When in use, take 80 parts of the brazing material alloy powder and 20 parts of the brazing flux powder and mix thoroughly with alcohol, dry and grind it into a powder before use. The components of flux powder used are LiCl 38%, KCl 45%, NaF 10%, CdCl 2 4%, SnCl 2 3%, the melting point is about 390°C.

[0028] The above-mentioned solder-flux mixed powder is used for brazing coating of 4mm thick galvanized sheet base metal...

Embodiment 3

[0032] The composition of the zinc-based solder powder is: 2wt% aluminum powder, 1wt% copper powder, 20wt% tin powder, 0.2wt% rare earth metal, and the balance is zinc powder.

[0033] The preparation method is that the raw metal powder is ball-milled by a planetary high-energy ball mill to realize mechanical alloying. The ball milling speed is 300r / min, and the ball milling time is 2h. The whole process is protected by argon gas, and the ball mill tank is vacuumized and filled with argon gas repeatedly 3 times before ball milling.

[0034] When in use, take 93 parts of the brazing material alloy powder and 7 parts of the brazing flux powder and mix them thoroughly with alcohol, dry and grind them into powder again before using. The flux powder components used are LiCl 50%, KCl 40%, LiF 4%, SnCl 2 3%, ZnCl 2 3%, the melting point is about 360°C.

[0035] The above-mentioned solder-flux mixed powder is used for brazing coating of 8mm thick galvanized sheet base metal, and...

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Abstract

The invention discloses zinc-based brazing filler metal powder for brazing coating of a galvanized sheet along with welding. The zinc-based brazing filler metal powder comprises the following components of 4-10 wt% of aluminum powder, 2-5 wt% of copper powder, 10-20 wt% of tin powder, 0.3-0.8 wt% of rare earth metal and the balance zinc powder. The raw materials are mixed and then subjected to ball milling through a high-energy ball mill, and mechanical alloying is achieved; and 80-93 parts of the brazing filler metal powder are taken and uniformly mixed with 7-20 parts of chloride brazing flux powder with alcohol, and the mixture is dried and ground again into powder for use. According to the brazing filler metal powder, supplementary coating of a burnt zinc layer can be achieved while welding is conducted under the condition that an extra heat source is not added, the problem that the corrosion resistance of a welded joint is poor due to the fact that the zinc layer is burnt out in the welding process is effectively solved, and the production efficiency can be obviously improved compared with the prior art.

Description

technical field [0001] The invention belongs to the field of welding, in particular to a galvanized sheet coated with zinc-based solder powder for welding. Background technique [0002] Heat-based galvanized sheets are widely used due to their excellent corrosion resistance. However, the boiling point and vapor pressure of the coating are relatively low, and the zinc coating near the weld will inevitably evaporate and oxidize at a higher temperature during the welding process. Therefore, after welding, the position near the weld seam, especially the welding toe, will lose the protection of the zinc layer, resulting in a decrease in corrosion resistance, and it will become a shortcoming of the corrosion resistance of the overall structure. At present, a commonly used method is to use cold-sprayed zinc coating to re-coat the zinc layer after welding, but this technology needs to be polished after the weld is completely cooled, which increases the process and increases the cos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/28B23K35/40B22F1/00C22C18/00
CPCB23K35/282B23K35/40C22C18/00
Inventor 潘进马成赵兴科刘宏强孙力张鹏卢岳曹宏玮刘效云
Owner HEBEI IRON AND STEEL