For successful brazing to occur, the joints to be brazed have to be designed properly, and then properly manufactured to attain and maintain those shapes and dimensions. This brief article looks at the first of some important design considerations to ensure that brazed joints will work.
Types of Brazed Joints: There are basically two types of joint designs used in brazing: butt-joints and lap-joints. All other joint designs are modifications of these two. The illustration below shows both good and bad ways to assemble such joints. A number of brazing shops today, unfortunately, take shortcuts or overlook important fit-up considerations in an effort to quickly make parts and braze them so that they can get them back to their customer as quickly as possible. These shortcuts can result in poorly brazed assemblies, or in premature field-failures when the parts are placed in service. When shops do not take the time to ensure proper fit-up of the parts before brazing, costly mistakes often result!