Vacuum brazing paste solder free of brazing flux, preparing method and using method of solder
A technology of brazing paste and solder, applied in welding equipment, welding/cutting media/materials, manufacturing tools, etc., can solve the problems of reducing the performance of welded joints, electrochemical corrosion of welded joints, and inability to discharge flux completely. The effect of saving solder, strong applicability, and suitable for automatic production
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specific Embodiment approach 1
[0035] Specific embodiment one: the present embodiment does not contain brazing flux and the vacuum brazing paste solder is composed of 45% to 60% solder alloy powder and 40% to 55% binder according to the mass fraction; the paste solder No brazing flux is contained in the material; the brazing alloy powder is prepared from 6% to 10% Mg, 15% to 20% Cu and 70% to 75% Al according to the mass fraction; the binder is prepared from It consists of 75%-85% hexanediol, 8%-12% rosin resin, 2%-6% n-decyl alcohol and 1.5%-4% glycerin; the particle size of the solder alloy powder is less than 49 μm.
specific Embodiment approach 2
[0036] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that transition group elements are also added to the vacuum brazing paste solder without flux, and the addition amount of the transition group elements is 0.1%. ~3.5%. Others are the same as in the first embodiment.
specific Embodiment approach 3
[0037]Embodiment 3: This embodiment is different from Embodiment 1 or Embodiment 2 in that: the transition group element is Ti. Others are the same as in the first or second embodiment.
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