Vacuum brazing furnace Manufacturers is in the brazing process, the brazing temperature, holding time, heating rate, cooling rate and vacuum degree in vacuum and protect gas brazing, the purity and gas partial pressure and so on various important welding parameters, either directly or indirectly affect the solder melting and gap filling effect, the extent of interaction affects the mother material and solder, soldering welding head of the regional organization performance, directly determines the quality of braze welding head.
The temperature of vacuum brazing furnace is the main welding parameter. Determine the brazing temperature is the important basis of the melting point of filler metals, brazing temperature control usually in 25 ~ 60 ℃ higher than that of solder the liquidus temperature range, in order to reduce the surface tension of the liquid solder, improve the effect of wetting and caulking, and make the interaction of solder and base can be fully, improve the strength of the joint.
The temperature range does not include all the solder, for some filler metals such as nickel metallurgical, in order to make the solder with the parent metal can produce sufficient reaction, brazing temperature may be higher than solder the liquidus temperature above 100 ℃. And some solder solidus and liquidus interval is larger, below the liquidus temperature has a significant amount of liquid phase, there is a certain liquid, the brazing temperature can be equal to or slightly below the solder the liquidus temperature.
Interact with parent metal solder, due to great changes in the process of caulking its branch and become the new alloy, the brazing temperature should be formed in the brazing seam is based on the new alloy melting point.
When choosing brazing temperature, vacuum brazing furnace Manufacturers should take into account the influence of brazing heat cycle on the properties of the mother material, strictly prevent the growth or overheating of the hard grain, and strictly prevent the brazing of the mother material.
The brazing temperature is too high and it is easy to produce corrosion deficiency, which is to leave a pit in the joint because of the inflow of liquid solder.