You can not combine dip brazing and vacuum brazing, i.e. a chassis wall that was vacuumed brazed can have folded fin added via dip brazing. But it can be advantageous to combine vacuum brazed components with dip brazed components via the bolted/bonded method. By combining methodologies, you can produce cost effective, but flexible design that meets the end requirements. An example of this might be a combination liquid cooled chassis that also includes some air-cooled aspects. In this example, the portions of the chassis with liquid channels might be vacuum brazed but the air-cooled portions are dip brazed and the two pieces are bolted and bonded together. Another reason for mixing methodologies is size limitations. If you have a significantly large chassis that is designed with liquid passages thru the base and side walls, it may be too difficult, or cost prohibited to build as a single piece. If you vacuum braze the part independently, but use a bolted methodology and introduce an oring, then you have created a leak-free way of combining multiple parts.
Please contact Wakefield Thermal Coolvations group for more information or for help in designing a custom solution for you.
Combination (Vacuum Brazed side walls, and top wall, Bolted together with o-rings)