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Aqueous nickel welding paste for stainless steel brazing

A stainless steel and brazing technology, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve problems affecting the controllability and manufacturability of the feeding amount, affecting the appearance of the product, and deteriorating the working environment.

Inactive Publication Date: 2010-03-17
GUANGZHOU RES INST OF NON FERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the color of copper solder paste is obviously inconsistent with stainless steel, which affects the appearance of the product; and the price of silver solder paste is too expensive, therefore, nickel solder paste is more and more widely used in the stainless steel industry
Oily nickel solder paste has the following disadvantages in the application process: because the viscosity of the solder paste is easily affected by temperature changes, the solder paste is often too thin or too dry due to high or low temperature, which seriously affects the controllability and manufacturability of the dosage. Moreover, the oily solder paste has a lot of smoke during the welding and heating process, which deteriorates the working environment, and the oily solder paste adheres to containers, equipment, etc. during application, making it difficult to clean. Therefore, the market demand for water-based nickel solder paste is gradually increasing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Cr: 11%, Fe: 1.5%, C: 1.0%, Si: 2.0%, P: 9.0%, and the balance is Ni. Accounting for 5.6% of the total weight of the solder paste Paste binder: 10% polyvinyl alcohol with a molecular weight of 1500, 20% polyacrylamide with a molecular weight of 6000, 35% water, 10% isopropanol, 20% glycerin, polyether modified Simethicone 5%.

Embodiment 2

[0021] Cr: 15%, Fe: 0.2%, C: 0.01%, Si: 0.4%, P: 8%, Zr: 0.01%, B: 0.03%, and the balance is Ni. Accounting for 6% of the total weight of the solder paste as a paste binder: 15% of carboxymethyl cellulose with a molecular weight of 100,000, 15% of methyl cellulose with a molecular weight of 10,000, 55% of water, 13% of glycerin, polyether modified methyl Silicone oil 2%.

Embodiment 3

[0023] Cr: 12%, Fe: 0.8%, C: 0.04%, Si: 0.8%, P: 10%, V: 0.04%, B: 0.03%, and the balance is Ni. Accounting for 5.25% of the total weight of the solder paste as a paste binder: 25% of carboxymethyl cellulose with a molecular weight of 10,000, 6% of methyl cellulose with a molecular weight of 100,000, 20% of water, 26% of isopropanol, and 18% of glycerol, Polyether modified dimethyl silicone oil 2.4%, hydrophilic self-emulsifying methyl silicone oil 2.6%.

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Abstract

The invention relates to an aqueous nickel welding paste for stainless steel brazing, which has the characteristics that: the welding paste is formed by 90-96 percent of brazing filler metal and 4-10percent of paste binders by weight percentage; the brazing filler metal comprises 4-18 percent o f Cr, 0.2-4 percent of Fe, 0.01-0.1 percent of C, 0.1-5 percent of Si, 5-10 percent of P and remainingamount is Ni. The paste binder is formed by the following constituents by weight percentage: 28-58 percent of mixture of carboxymethylcellulose with 10000-1000000 molecular weight and methylcellulose,40-70 percent of aqueous solvent and 1-10 percent of lubricants; or the paste binder is formed by 25-55 percent of one or a plurality of polyacrylamide with 1000-10000 molecular weight, polyacrylic acid, polymethylacrylic acid and copolymer, polyvinyl alcohol or polyoxyethylene, 40-70 percent of aqueous solvent and 1-10 percent of lubricants. The welding paste is the aqueous nickel welding pastewhich is convenient for automatic feeding, is easy to clear and has consistent color of a welding line and stainless steel; therefore, the aqueous nickel welding paste is suitable for stainless steelbrazing.

Description

technical field [0001] The invention relates to a solder paste for stainless steel brazing, in particular to a water-based brazing paste for stainless steel. Background technique [0002] As a paste-like brazing material, solder paste can be automatically controlled and injected to quantitatively apply the solder paste to the solder joints of the workpieces to be welded, so as to realize continuous batch welding production. With the continuous improvement of the automation of welding production technology, the demand for welding material products is becoming more and more diversified. The use of cream solder in the automatic brazing production of parts with complex shapes, dense weld seams and high dimensional accuracy can greatly improve High production efficiency and stable quality. The production efficiency of automatic brazing is more than ten times that of manual operation, and it can ensure the stable quality of each batch of products. In addition, automatic brazing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/22B23K35/30B23K35/363
Inventor 杨凯珍刘凤美向杰易振华赵四勇张宇鹏刘师田
Owner GUANGZHOU RES INST OF NON FERROUS METALS
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