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PROCESS: The CuproBraze process is a brazing process specifically developed for the manufacturing of automative and heavy-duty industrial heat exchangers. By using high strength copper alloys it is possible to manufacture light, strong, efficient and compact heat exchangers at a low cost with this enviromentally friendly, lead-free process. The brazing of CuproBraze radiators uses a nontoxic low temperature melting alloy that works well in a nitrogen based controlled atmosphere furnace. The brazing material is lead free and there is no post-braze treatment required, such as rinsing. Binders and braze alloys can be applied to the tubes, fin tips or headers by spraying, brushing or rolling. After brazing, the brazed copper-brass joints are significantly stronger than the solder metal and do not suffer from galvanic corrosion. Developed for this process, anneal resistant header, fin and tube materials assure the strength of the products.
FURNACE: SECO/WARWICK can provide either a two or three chamber CuproBraze Furnace System. The two chamber is a front-loading furnace with a purging/cooling vestibule and a convection heating chamber. The furnace is a
compact design with floor space (8m x 8m). The heating system consists of a high pressure, high velocity recirculation fan
passing the heated atmosphere over heating elements to provide optimum flow of nitrogen through the workload to obtain the
tight temperature uniformity required for this process. At the operating temperatures of the furnace, convection heating
is the quickest way of transfering heat to the workload. Continious and costum designed load areas are also available.
CONTROLS: A PLC based control system is responsible for temperature control, sequencing and logic for the system with
the option of adding SECO/WARWICK's ACCUBRAZE computer controls to enhance the interfacing between the operator and the PLC.
A tpical purging, heating and cooling cycle can be achieved in 20 minutes for a single layer of parts or 30 minutes for a
double layer in the two chamber design. The three chamber furnace doubles this production. Cycle times will vary dependent
upon the products mass and configuration.
