Brazing Application
Fins must be brazed onto single-piece sections of tube up to 6m long. Approximately 220 km of tubing may be used in a single heat exchanger. High flexibility and the ability to resist tension and crushing during assembly are crucial. High strength, corrosion resistant joints with a uniform thickness are essential. Brazing filler metals in powder and powder-binder composite forms are poor candidates because of contaminating residues and possible joint shrinkage.

Solution
MBF offers the advantages of purity and consistent thickness allowing a fully automated process. Each tube is rotated to wrap it with foil and fin. The machine tensions brazing foil and fin stock as it turns the tube. The fins are crimped at one edge which is pressed tightly against the brazing foil. The assembly is then brazed in a pure argon continuous furnace at 1065°C for 10 minutes. High automation and low manufacturing cost are provided.