Solder without cadmium and silver
A manufacturing method and technology of silver brazing filler metal are applied in the field of cadmium-free silver brazing filler metal and brazing material, which can solve the problems of non-conformity and high price, and achieve the effects of dense welding seam, high mechanical strength and smooth surface.
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Embodiment 1
[0010] According to the weight formula ratio of the alloy (cadmium-free silver solder, the same below), its composition is: copper: 28.5%, zinc: 30.5%, tin: 0.6%, silicon: 0.01%, mixed rare earth (rare earth elements lanthanum and cerium Main mixture, the same below): 0.1%, the rest is silver.
[0011] The solidus temperature of the "cadmium-free silver solder" obtained by the above composition ratio is about 625°C (reference value), the liquidus temperature is about 730°C (reference value), and FB102 flux is used, and the brazing base metal is as follows See the data in brackets for joint strength when combined: copper-copper alloy (σ b =230±20MPa, τ=195±15MPa), copper or copper alloy - stainless steel (σ b =340±20MPa, τ=250±15MPa), stainless steel-tungsten carbide (σ b =380±20MPa, τ=280±15MPa).
Embodiment 2
[0013] According to the weight formula ratio of the alloy, its composition is as follows: copper: 30%, zinc: 32%, tin: 2%, silicon: 0.5%, mixed rare earth: 0.05%, and the rest is silver.
[0014] The solidus temperature of the "cadmium-free silver solder" obtained by the above composition ratio is about 610°C (reference value), the liquidus temperature is about 710°C (reference value), and FB102 flux is used, and the brazing base metal is as follows See the data in brackets for joint strength when combined: copper-copper alloy (σ b =235±20MPa, τ=200±15MPa), copper or copper alloy - stainless steel (σ b =330±20MPa, τ=250±15MPa), stainless steel-tungsten carbide (σ b =360±20MPa, τ=270±15MPa).
Embodiment 3
[0016] According to the weight formula ratio of the alloy, its composition is as follows: copper: 32%, zinc: 33.5%, tin: 1%, silicon: 0.9%, mixed rare earth: 0.1%, and the rest is silver.
[0017] The solidus temperature of the "cadmium-free silver solder" obtained by the above composition ratio is about 630°C (reference value), the liquidus temperature is about 730°C (reference value), and FB102 flux is used, and the brazing base metal is as follows See the data in brackets for joint strength when combined: copper-copper alloy (σ b =230±20MPa, τ=200±15MPa), copper or copper alloy - stainless steel (σ b =320±20MPa, τ=260±15MPa), stainless steel-tungsten carbide (σ b =370±20MPa, τ=270±15MPa).
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