Controlled Atmosphere Brazing for manufacturing aluminum heat exchangers

SECO/WARWICK the manufacture of heat treatment Controlled atmosphere brazing of aluminum (CAB), using a equipment has developed and provide wide range of CAB noncorrosive flux, is the preferred process for manufacturing equipment on the market. Due to continues improvements aluminum heat exchangers. SECO/WARWICK CAB becomes a global leader of CAB equipment on the market. ALUMINUM BRAZING SECO/WARWICK is one of the world’s most experienced and Since entering this field in 1983, SECO/WARWICK has led the development of advanced technology in the continuous flow brazing process. Capitalizing on over...

Accepts a less demanding dimensional fit-up. Requiring no post braze cleaning, less capital intensive compared to vacuum brazing. Continuous flow for high volume throughput. These innovations, along with others, have led to the design of a variety of brazing furnace systems to meet the growing demand for aluminum brazing. Each of these systems provides unique benefits based on the size and scope of a manufacturer’s individual brazing needs. Controlled atmosphere brazing of aluminum (CAB), using a noncorrosive flux, is the preferred process for manufacturing aluminum heat exchangers. Since entering...

CONTROLLED ATMOSPHERE BRAZING PROCESS A fully configured standard CAB furnace system includes a thermal degreaser, a fluxer unit, a dry off oven, and the CAB furnace. These systems can be configured in an in-line, a continuous rectangular line, or a U-shaped line to meet your plant’s installation space requirements. Thermal Degreaser A Thermal Degreaser Oven will thermally remove the lubricating oils present on the heat exchanger from prior fabrication stages. The assembled and fixtured product will be placed on the oven conveyor for processing. The oven will typically. operate at 150-300°C to...

Flux Application The spray nozzles apply in the flux mixture directly to the The dry off oven is the final preparation before brazing. The body part or header as your specifications require. oven’s internal components are constructed of stainless steel Once applied, a series of adjustable, powerful air knives, to ensure a long working life. positioned over and to the sides of the conveyor, strip away Heat is provided by electric, propane, or a natural gas fuel the excess flux from the part. The complete system includes source. Heat recovery the parts are conveyed into the oven, necessary pumps,...

Natural gas fired combustion systems also available. A radiation braze CAB furnace is an ideal method for brazing Temperatures are controlled uniformly throughout the length similar size products in a continuous flow environment. If of the furnace by several independently heated zones. you intend to produce a single or only a few variations of that product, a radiation furnace system makes sense. Muffle design is quite important to the overall efficiency of the system. SECO/WARWICK manufactures its muffles This furnace is designed to use a heated muffle to braze the with the high level of craftsmanship...

CONVECTION / RADIATION CAB FURNACE When your brazing needs are more diverse, a combination convection preheating and radiation brazing furnace system could be your answer. type of system is more forgiving when running production intermittently. The initial heat zone, uses both convection and radiation heat to uniformly preheat an assortment of products. Once preheated, the product moves into the radiation brazing section, where the product is brought to and held at a uniform The addition of convection preheating improves the furnace’s temperature to allow the clad materials to melt and form a...

CONVECTION CAB FURNACE A pure convection heat controlled atmosphere furnace system is the most efficient means to braze a wide variety of products in the shortest possible cycle time. with diverse products. These furnace systems are popular in the automotive industry where installation space requirements are at a premium and SECO/WARWICK convection furnaces maintain excellent intermixing of various size products is the norm. Convection temperature uniformity to within 3 degrees C. Convection heat systems show great promise in emerging applications, transfer is used to bring the entire part to...

ACTIVE ONLY® CONVECTION CAB FURNACE The Active Only furnace system is designed to operate on a Only furnace is based on a six step indexing cycle. The six indexing positions include the load table position, the dry off oven, the entrance purge chamber, the patented convection brazing chamber, the air jacketed cooling. chamber and the airblast chamber. The product runs in a horizontal position with an infinitely adjustable dwell time based on the hearth load and load part-time basis. configuration. A thermocoupled work zone monitors recovery The furnace can be brought up to brazing temperatu innovative...

VERTICAL BRAZING CAB FURNACE A uniquely designed version of an „Active Only” indexing furnace has been developed, where the brazed elements are positioned vertically. For some types of heat exchangers such like plate and bar vertical orientation provides benefits as the cladding melts. It allows the joints to be evenly filled on a horizontal plane. This prevents the brazing alloy from accumulating on one side of the heat exchanger. chamber but also from the internal openings of the heat exchanger. This feature is especially This solution has limited the nitrogen consumption and has important...

VACUUM PURGE CAB FURNACE For prototyping low volume brazing The vacuum purge one chamber batch CAB furnace is an advanced hot wall, front loading retort furnace with vacuum purging especially designed for R&D aluminum brazing. The standard furnace hot zone is 600 mm x 600 mm x 900 mm (24” x 24” x 36”), however SECO/WARWICK can custom engineer furnaces to suit the application. 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....