controlling-gap-filling-of-a-brazingSolder deposit inside, joint can be monitored through solder flow.Flange prevents axialshifting if the solderedjoint fails. Conical contact surfaceprevents axial shifting.Possibilities for improving the safety of a soldered connection for fastening the membrane for the intermediate stage seal in a turbine:Positive fitting should make brazed connections redundant against failure. Solder deposits should be located so that it is possible to know if the gap is filled.Brazed fastening tabFastening tabbrazed into a closed groove inthe blade shroud Fastening tabbrazed into agroove in the blade shroud Fastening tabbrazed into an enclosed groovein the blade shroudAscending order of favorable designs from the point of view of safety Lower production costsDesigning a fastening mechanismusing safety considerations:"Unsafe" versionVersion with "fail safe"behaviorSolder deposit is outside, making thejoint difficult to monitor.Cylindrical contact surface allows the membrane to shiftaxially if the soldered jointfails.If the brazed joint fails, there is a danger that the sheet metal membranecould shift against the turbine diskand cause it to fracture.