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Brazing filler metal for connecting copper and stainless steel, application of brazing filler metal and method for welding silencer

A technology of stainless steel and muffler, which is applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc. It can solve the problems of unsatisfactory muffler muffler effect, reduced service life and low production cost, and achieve good muffler effect, Increased service life and low production costs

Inactive Publication Date: 2013-08-21
ANHUI ZHONGHUI REFRIGERATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problem of unsatisfactory muffler effect and reduced service life of the muffler welded with existing welding materials, the present invention relates to a brazing filler metal for connecting copper and stainless steel and its application and method for welding mufflers. Flame welding can be used, and the welding efficiency is high, and the production The cost is low, the muffler has good noise reduction effect after welding, and the welding is convenient

Method used

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  • Brazing filler metal for connecting copper and stainless steel, application of brazing filler metal and method for welding silencer
  • Brazing filler metal for connecting copper and stainless steel, application of brazing filler metal and method for welding silencer

Examples

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Effect test

Embodiment 1

[0033] A brazing material connecting copper and stainless steel and its application and a method for welding a muffler are used to process the muffler of Shanghai Fujitsu model XYQ-FT401006-00, and the steps are as follows:

[0034] 1) Inspection before welding requires that the outer surface of the weldment be smooth and flat, without cracks and grooves, and without impurities and dirt;

[0035] 2) Prepare solder, the composition and weight percentage of solder are 26% Cu, 34% Ag, 6% Co, 3% Li, 1.2% Sn, 0.6% Ni, 2% B, 0.8 % Mn, 0.6% Si, 0.013% La, 0.017% Pr, 25.77% Zn, the inner diameter of the expansion pipe interface is 14.1mm, the outer diameter of the intake pipe is 13.7mm, the thickness of the expansion pipe is 0.9mm, and the thickness of the intake pipe is 0.9mm, wire diameter is 1.08mm;

[0036] 3) Adjust the liquefied petroleum gas, O 2 , N 2 Pressure: the pressure of liquefied petroleum gas ≥ 0.05MPa, O 2 Pressure ≥ 0.3MPa, N 2 The pressure ≥ 0.02Mpa, adjust the...

Embodiment 2

[0044] Same as Example 1, the difference is that this example is used to process the Zhuhai Gree silencer whose model is XYQ-GL505434--00, the composition and weight percentage of the solder in step 2) are 30% Cu, 36% Ag, 7% Co, 3.7% Li, 1.3% Sn, 1.6% Ni, 1.8% B, 0.6% Mn, 1% Si, 0.05% La and 0.06% Pr, the balance is Zn, the inner diameter of the expansion pipe interface is 13.47mm, the outer diameter of the intake pipe is 13.12mm, the thickness of the expansion pipe is 0.92mm, the thickness of the intake pipe is 0.92mm, and the diameter of the welding wire is 1.07mm. In step 4), the heating and brazing time is set to 9s, and the flame spray welding is started. The wire waiting time of the flame spray welding is 3.5s, and the wire feeding time is 8.8s.

[0045] After this embodiment is used in the air conditioner of model TCL KFRd-25GW / DE22, the final reduction in noise is 15db more than that of the muffler welded by the traditional welding process.

Embodiment 3

[0047] Same as Example 1, the difference is that this example is used to process the Zhuhai Gree silencer model XYQ-GL405101--00, the composition and weight percentage of the solder in step 2) are 28% Cu, 35% Ag, 7.5% Co, 3% Li, 1.4% Sn, 1.5% Ni, 1.95% B, 1.1% Mn, 1.3% Si, 0.06% La, 0.08% Pr, 14.1% Zn, the inner diameter of the expansion pipe interface is 10.84mm, the outer diameter of the intake pipe is 10.64mm, the thickness of the expansion pipe is 0.94mm, the thickness of the intake pipe is 0.94mm, and the diameter of the welding wire is 1.04mm. In step 4), the heating and brazing time is set to 9s, and the flame spray welding is started. The wire waiting time of the flame spray welding is 3.3s, and the wire feeding time is 8.4s.

[0048] After this embodiment is used in the air conditioner of Midea (Midea) KFR-23GW / DY-IF (R3), the final reduction in noise is 13db more than that of the muffler welded by the traditional welding process.

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Abstract

The invention relates to brazing filler metal for connecting copper and stainless steel, application of the brazing filler metal and a method for welding a silencer and belongs to the field of brazing filler metal and silencer welding methods. The brazing filler metal comprises, by weight, 26-34 percent of Cu, 34-35 percent of Ag, 5-8 percent of Co, 2-4.5 percent of Li, 1-1.5 percent of Sn, 0.2-1.8 percent of Ni, 1.8-2 percent of B, 0.5-1.3 percent of Mn, 0.1-1.4 percent of Si, 0.03-0.16 percent of mischmetal and the balance of Zn. The mischmetal is composed of La and Pr, the mass ratio of La and Pr is equal to the mass ratio of Cu and Ag. When the brazing filler metal for connecting the copper and the stainless steel is applied to welding of the silencer, flames are utilized for welding, the requirement for welding is met, meanwhile, welding efficiency is high, production cost is low, a noise reduction effect after the silencer is welded is good, and the service life of the silencer is prolonged.

Description

technical field [0001] The invention relates to the field of brazing material and a welding method for a muffler, in particular to a brazing material connecting copper and stainless steel, its application and a method for welding a muffler. Background technique [0002] Brazing is to use brazing material with a lower melting point than the base metal to heat the base metal together. When the base metal does not melt, the brazing material is melted, and the gap between the joints of the base metal is wetted and filled to form a weld. In the brazing joint, the solder and the base metal dissolve and diffuse into each other to form a firm bond. Brazing has the advantages of low heating temperature, small changes in the structure and mechanical properties of weldments, flat and smooth joints, and beautiful appearance, and it can connect different materials. However, brazing also has obvious disadvantages, that is, the strength of brazed joints is relatively low, so lap joints ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K1/19
Inventor 俞洪长宋玉庆吕晓江王永
Owner ANHUI ZHONGHUI REFRIGERATION
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