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Base Treatments

Impact Bonded vs. Braised Bases

When applying a disc to a vessel, it can be applied in two ways: impact bonded or braised.

Braising: This is the process of joining metals using a filler. A braised base is applied by spreading an even layer of flux over the base of the vessel, sitting the disc to be applied on top, and then applying pressure and heat to form the bond. This process is done at a temperature range of 470C/900F - 1190C/2200F. In braising, the base metals do not melt, so the temperatures used are based on the base metals being joined and are lower than their melting points, brazing is a superior choice in joining dissimilar metals.

Impact Bonding: An impact bonded bases uses friction to form the bond between the base of the vessel and the disc. No adhesive element is applied. The disc is place on the base of the vessel, and when passed through the impact bonding machine, through pressure and friction the bond is formed. The typical instantaneous pressure applied by a friction press ranges from 800 to 1500 tons.

Method Pros Cons
Braising Less expensive Air pockets can form if flux is not applied evenly, and if disc is overheated in use, it can separate from vessel
Impact Bonding Complete, secure attachment of the disc to the vessel More expensive, requires special impact bonding equipment


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