Batch Brazing Furnaces for Aluminum
The Universal CAB Batch Furnace provides high aluminum brazing quality for lower volume producers. It is designed to braze the widest variety of heat exchangers in a horizontal or vertical position depending on the product design requirements. It operates on a part-time basis and produced the highest quality parts with the standard or vacuum purge options, respectively. The furnace can be brought up to brazing temperature from ambient and conditioned to a proper atmosphere in a very short time. The batch system allows for variable heating and cooling rates, depending on product requirements.
Two basic types of batch models are available in a variety of configurations in the standard batch CAB plus the optional units using vacuum purging. The commonly used two-chamber atmosphere batch system allows for variable heating and cooling rates, depending on product requirements. One chamber provides purging and cooling in the nitrogen atmosphere while the other chamber is the convection-heated brazing furnace. To get the proper atmosphere parameters, several exchanges of the volume in the entrance chamber is required in the standard batch CAB unit. The same level of an atmosphere can be reached by using a vacuum purging option saving dozens cubic meters of nitrogen per cycle.Two chamber vacuum purging units can also be upgraded later to three chambers unit for economically increasing the output. Other components may be added like degreasing/drying/debinding oven, fluxer, transfer systems, final cooling, and computer controls.
/ Highest flexibility
in part types and brazing position: horizontal or vertical
/ Short preparation time
with only 2-3 hours required
/ High brazing quality
using a clean nitrogen atmosphere, high-temperature uniformity, and sharp heating profiles
/ Fits into tight locations
due to a compact design
/ Lower cost
for investment, installation, and operation
Additional benefits of Vacuum Purging option:
/ Significantly lower nitrogen consumption
than other batch units
/ More shiny silver surface after brazing
results comparable with vacuum brazing
/ Higher brazing quality of products
due to perfect purging and nitrogen refilling with internal closed volumes of the cores.
with Vacuum Purging
Single chamber furnaces with vacuum purging are also available for special applications, mostly dedicated for R&D laboratories, prototyping, and any initial low volume production. This special design enables precise control of the heating and cooling speeds during the entire cycle. Atmosphere conditions like oxygen and/or dewpoint can be set on the defined level. This batch-type furnace allows the user to simulate a wide range of brazing conditions and brazing process profiles that would be experienced in a continuous furnace.
This furnace has a compact design with an internal recirculation fan and external cooling air blower. The packaged furnace system consists of the heating system, vacuum pumping system, nitrogen system, and atmosphere controls. The brazing cycle begins with vacuum purging of the stainless steel retort with N2 back purge, followed by fast and uniform heating up to brazing temperature. When the soak cycle is complete, the cooling cycle is initiated.
The advantage of a vacuum purge batch furnace is that it is always ready for work at room temperature and it is cold when the cycle is completed. No preparation pre-heating is required.
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Allowing a large variety of different heat exchanger types and sizes to be brazed
By adapting the vacuum purging operation in the CAB process, the brazing quality may be significantly improved as well as reducing operational utility costs