Brazing filler metal for high-frequency induction brazing of aluminum steel and brazing method of brazing filler metal

Abstract

The invention relates to a brazing filler metal for high-frequency induction brazing of aluminum steel and a brazing method of the brazing filler metal. In the brazing filler metal, Al-Si based alloy powder is used as a brazing filler metal component of a welding flux; the granularity of the brazing filler metal alloy is -150 to +300 meshes, and the melting point of the brazing filler metal alloy is 570 to 580 DEG C; three kinds of villiaumite, namely KF, NaF and AlF3, are used as a brazing flux in a ratio of (KF and NaF) to AlF3 of 1 to 10; sodium potassium tartrate is used as a bonding agent; and the content of the brazing filler metal in the welding flux is 60 percent, the content of the brazing flux is 38 to 39 percent, and the bonding agent accounts for 1 to 2 percent. The brazing method comprises the following steps of: preparing the components; making the components pasty by using absolute ethanol; removing oxidized membranes from the surfaces to be brazed of steel and aluminum workpieces, and washing by using acetone; uniformly coating the mixed welding flux on the surfaces to be brazed and pressurizing, placing the welding flux into high-frequency induction heating equipment and protecting by using argon; and under a voltage of 4.5kV, heating for 30 seconds and unloading the voltage, and taking the workpiece out if the temperature of the workpiece is below 50 DEG C.

Description

technical field [0001] The invention relates to the technical field of aluminum / steel brazing. Background technique [0002] At present, more than 50% of the electric energy used in my country's electrolytic aluminum production is consumed by the aluminum electrolytic cell and the electric field, magnetic field and thermal field in the production process, and electrolytic aluminum production still has great energy-saving potential. Now the common aluminum electrolytic anode steel claw is made of low-carbon cast steel, and the combination of steel-aluminum composite explosive welding sheet transition and aluminum guide rod welding is used to form an anode conductive device, which mainly plays the role of conducting current and carrying the weight of the anode carbon block. , mainly conductive. This kind of steel-aluminum composite explosive welding sheet has high local voltage drop and large current loss in the electrolytic production process, which leads to excessive consum...

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Problems solved by technology

However, the physical properties such as density, melting point, and thermal conductivity of aluminum and steel are very different, which promotes the generatio...

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