High-activity flux-cored brazing filler metal capable of improving brazing strength of heterogeneous materials and preparation method of high-activity flux-cored brazing filler metal
A heterogeneous material, high activity technology, used in welding/cutting media/materials, welding equipment, manufacturing tools, etc., can solve the problems of low connection strength and weak activity of joints
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[0041] The present embodiment also provides a preparation method of flux-cored solder, comprising the following steps:
[0042] S11: smelting to obtain a brazing filler metal alloy according to the metal ratio of the sheath, and rolling the brazing filler metal alloy into a sheet-like brazing filler metal sheath;
[0043] S12: wrap the sheet brazing filler metal on the surface of the flux core to obtain a composite flux core;
[0044] S13: Drawing the composite flux core to obtain flux cored solder.
[0045] In this embodiment, the preparation of the flux-cored solder can also be obtained by first rolling the outer skin of the sheet-like solder into a desired shape, and then filling the flux core inside. This method is simple to operate and suitable for large-scale production.
[0046] Further, the smelting step of the solder alloy includes:
[0047] S21: put silver, copper, germanium and / or silicon and / or active elements into the crucible, conduct induction heating, and ad...
Embodiment 1
[0058] This embodiment provides a high-activity solder for improving the brazing strength of dissimilar materials, including: 50 parts by mass of silver; 25 parts by mass of copper; 22.1 parts by mass of zinc; 2.5 parts by mass of cobalt; 0.2 parts by mass of germanium; and 0.2 parts by mass of active metal titanium parts by mass.
[0059] Use the brazing filler metal provided in this example to braze 45# steel / YG6X, and measure the shear strength of the joint. The shear strength of the joint is shown in Table 1.
Embodiment 2
[0061] This embodiment provides a highly active solder for improving the brazing strength of dissimilar materials, including: 30 parts by mass of silver; 44 parts by mass of copper; 23.5 parts by mass of zinc; 1.5 parts by mass of cobalt; 0.7 parts by mass of silicon; and 0.3 parts by mass of active metal chromium parts by mass. The electron microscope image of the microstructure of the solder is as follows figure 2 shown.
[0062] Use the brazing filler metal provided in this example to braze 45# steel / YG6X, and measure the shear strength of the joint. The shear strength of the joint is shown in Table 1.
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