Vacuum Brazing
Vacuum Brazing is an advanced high temperature brazing technique which is performed at high temperatures (>800°C) in a protective atmosphere. Other brazing techniques are soft brazing (<450°C) and hard brazing (450-800°C). Advantage of high temperature brazing compared to soft and/or hard brazing is that a joint is created with higher strength and higher quality, without using fluxing agents. Because of that, no undesired surface reactions will appear and the parts remain very clean and bright after the brazing process. Also the parts, after the high temperature brazing process, can be hardened with almost every hardening technique like carburizing, nitriding, nitrocarburising or vacuum hardening. It is even possible to do the hardening and brazing in one process.
Closely fitted parts can be Vacuum Brazed to form assemblies with extremely strong leak proof bonds.
Expertise within TTI especially with Nickel and Copper brazing has enabled dissimilar metals of complex geometry to be successfully joined.
Pastes, wire or foil are used as the brazing media and the components assembled under strict quality conditions prior to loading into a Vacuum chamber. The chamber is evacuated and the parts are heated at a controlled ramp rate under a set vacuum level to the braze temperature. The CNC Vacuum Furnace undergoes a pre-programmed cycle dependant on material and geometry conditions.
Finished brazing assemblies are bright, clean and the process results in minimal distortion.
Brazing is carried out at our Telford, Letchworth and Luton Plants. Please see individual Plant pages for contact details.