Copper welding paste for braze welding and preparation method thereof

A copper solder paste and brazing technology, applied in welding equipment, welding media, manufacturing tools, etc., can solve problems such as inappropriate copper solder paste, and achieve high joint strength, collapse resistance, good fluidity, and low corrosion. Effect

Active Publication Date: 2014-03-26
SUZHOU CUBRAZING MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the welding process of copper solder paste, the brazing temperature is higher than 1090 °C, and the temperature for the complete decomposition of the paste should be 400-500 °C, so that the copper solder paste can form a sintering with a certain strength after the volatilization of the paste. Body, attached to the parts to be welded, therefore, the existing paste system for tin solder paste is not suitable for making copper solder paste

Method used

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  • Copper welding paste for braze welding and preparation method thereof
  • Copper welding paste for braze welding and preparation method thereof
  • Copper welding paste for braze welding and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] First, prepare the raw materials according to the following components:

[0047]

[0048]

[0049] Thereafter, the specific preparation steps include:

[0050] 1. Mix Cu powder and Fe powder in proportion in the mixer evenly;

[0051] 2. Add KF to a blender filled with deionized water and stir for 10 minutes;

[0052] 3. Add hydroxyethyl cellulose, xanthan gum and gum arabic to the above aqueous solution in proportion, stir for 120 minutes, then add glycerin, hydrogenated castor oil, silicone oil and N, N, N', N'-tetrakis-(2 Hydroxypropyl) ethylenediamine, stirred for 10 minutes to form a paste mixed with brazing flux;

[0053] 4. Add the mixed Cu powder and Fe powder into the paste, and stir for 45 minutes to make a copper solder paste.

[0054] The copper solder paste prepared according to Example 1 is mainly used for welding low-carbon steel parts. There is no residue on the surface of the parts after welding, the weld seam is fine and dense, and it has very...

Embodiment 2

[0056] First, prepare the raw materials according to the following components:

[0057]

[0058]

[0059] Thereafter, the specific preparation steps include:

[0060] 1. Add Cu 余量 sn 10 Ni powder and Ni powder are mixed evenly in the mixer in proportion;

[0061] 2. Mix dipropylene glycol monomethyl ether and 1,2-propanediol in a mixer for 10 minutes;

[0062] 3. Add sebacic acid and lauric acid to the above solvent;

[0063] 4. Add hydroxyethyl cellulose and methyl acrylate to the above solution in proportion, stir for 90 minutes, then add modified castor oil and acetylene glycol, and stir for 10 minutes to form a paste mixed with flux;

[0064] 5. The mixed Cu 余量 sn 10 Ni powder and Ni powder were added to the paste and stirred for 45 minutes to make a brazing paste. The copper solder paste prepared according to Example 2 is used for welding stainless steel components. After welding, the surface of the part is consistent with the color of the weld seam, and the ...

Embodiment 3

[0066] First, prepare the raw materials according to the following components:

[0067]

[0068] Thereafter, the specific preparation steps include:

[0069] 1. The Cu balance Sn 14 Ni 5 P 5 Powder and Cu 余量 sn 50 The powder is mixed evenly in the mixer according to the proportion;

[0070] 2. Mix diethylene glycol monoethyl ether and ethyl carbitol in a mixer for 10 minutes;

[0071] 3. Add hydroxypropyl starch, ethyl hydroxyethyl cellulose, hydroxypropyl cellulose and locust bean gum to the above solution in proportion, stir for 120 minutes, then add deionized salicylic acid amide and mineral oil, stir for 10 minutes Minutes to form a paste;

[0072] 4. The mixed Cu balance Sn 14 Ni 5 P 5 Powder and Cu 余量 sn 50 Add the powder into the paste and stir for 45 minutes to make a brazing paste.

[0073] The copper solder paste prepared according to Example 3 is used for low-temperature welding of low-carbon steel components, and better welding strength can be obtai...

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Abstract

The invention discloses copper welding paste for braze welding, a preparation method of the copper welding paste for braze welding and the application of the copper welding paste for braze welding. The copper welding paste for braze welding comprises 67wt%-92wt% of brazing filler metal, 8wt%-33wt% of pasty fluid and brazing flux of which the mass is 0-5% that of the brazing filler metal, wherein the brazing filler metal comprises Cu and/or one or more types of Cu alloy, the brazing flux comprises any one or more than two components of CaF2, KF, NaF, BaF2, sebacic acid, succinic acid, lauric acid and boric acid, and the pasty fluid comprises a solvent, a thickening agent, a rheological agent, an antifoaming agent and an activating agent. When the copper welding paste prepared through the method is applied before braze welding, the copper welding paste has good thixotropy, collapse resistance and fluidity; after braze welding, a part has high joint strength, a weld joint is plump and free of residues, and the part does not need cleaning; the copper welding paste can be widely applied to welding automobile pipe fittings, copper-based heat dissipation assemblies and stainless steel parts.

Description

technical field [0001] The invention relates to a welding material, in particular to a copper solder paste for brazing, its preparation method and application. Background technique [0002] With the development of high-efficiency mass production of modern industrial automation brazing, the welded workpieces are increasingly miniaturized and mass-produced, and the shape of the weld seam is constantly diversified and complicated. It is the trend of the times to replace the traditional wire-like, ring-like and strip-like welding materials with paste-like welding materials-brazing paste to realize high-efficiency automatic welding production. In recent years, my country has continuously introduced foreign advanced automatic brazing production lines, such as flame automatic brazing production lines and protective atmosphere mesh belt furnace brazing production lines; at the same time, many domestic manufacturers have independently developed more advanced automatic brazing product...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/363B23K35/30
CPCB23K35/302B23K35/362
Inventor 莫文剑
Owner SUZHOU CUBRAZING MATERIALS CO LTD
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