BrazeLet^® F86P-9003

Höganäs’ unique iron-chromium based stainless brazing alloy BrazeLet F86 provides high strength joints when brazing stainless steel materials in vacuum or protective atmospheres (dry hydrogen or argon). The brazing alloy is particularly well suited for brazing heat exchangers with strict requirements on corrosion resistance and metal ion leaching, for example in drinking water or purified water applications, and it is completely copper free. Compared to nickel-based brazing alloys it offers a more attractive and stable cost. Compared to most of the standard nickel-based brazing alloys, BrazeLet F86 is able to fill larger gaps without brittle phase lines or cracks, which leads to a more reliable and safe brazing as well as more flexibility in part tolerances.

The brazing paste BrazeLet F86P-9003 is typically in use for printing thin paste layers of about 0.05 – 0.2 mm on flat plates, on top of structured plates or fins by use of screens or stencils. A typical application is the printing on parts for flat heat exchangers. The use of rubber squeegees is recommended. Reliable printing requires a precise positioning fixture combined with the use of vacuum table or clamping device. Typical printing speed is 300 mm/s. Thin printing lines should have a width of >0.3 mm, small dots diameter should be >1 mm. The solvent based brazing paste BrazeLet F86P-9003 increases productivity wherever drying of the paste is an issue. The paste has no settlement, and no stirring is required in the equipment. However, when opening a can from stock it is always recommended to stir the paste.

The printed parts can be dried with standard drying process (hot air) at 120 – 170 °C. The drying time varies depending on thermal mass, design of the parts and the used furnace and needs to be established.