Patent ID: 8641845

Claim:
A method of determining bonding agent coverage in a joint between a first substrate and a second substrate, comprising: dispersing a marker material throughout a bonding agent, wherein the bonding agent comprises a metal in an unmelted state; melting the metal during a brazing process but not melting the marker material; solidifying the melted metal to form an actual bond in a joint between the first substrate and the second substrate; detecting the marker material in the joint through at least one of the substrates to ascertain an actual bond; and comparing the actual bond to an expected bond for the joint to determine the bonding agent coverage, wherein the first substrate and the second substrate are nickel-based alloys, wherein the bonding agent comprises nickel based brazing filler metal comprising: 3.10% boron; 7.0% chromium; 3.0% iron, 82% nickel; and 4.5% silicon, and wherein the marker material is tungsten.