Abstract A method of making a metallurgical joint between a berylliumbase part and a copper-base part comprises joining the berylliumbase part to a silver insert by electron-beam welding and then metallurgically joining the silver insert to the copper-base part. The electron-beam welding operation is effected by directing the beam against a transverse surface of the insert in such a position that the conical fusion zone developed by the beam is located substantially entirely in the silver insert and the seam between the beryllium and silver parts is substantially tangent to the perimeter of the conical fusion zone. The weld is formed by moving the beam along a path that maintains the aforesaid substantially tangential relationship.
The method of claim 1 in which: a. the central axis of said beam is disposed at an acute angle to said seam of such a value that said seam is substantially tangent to the perimeter of said conical fusion zone along most of the length of said fusion zone that borders said seam, b. said central axis is maintained at said acute angle while said beam is being moved relative to said insert.
Claim 2
Dependent Claim
14 words
The method of claim 1 in which said dissimilar material is a copper-base material.
Claim 3
Dependent Claim
14 words
The method of claim 2 in which said dissimilar material is a copper-base material.
Claim 4
Dependent Claim
19 words
The method of claim 1 in which said insert is joined to said second part by a brazing operation.
Claim 5
Dependent Claim
85 words
The method of claim 1 in which: a. the zone melted by said beam as it moves along said path is referred to herein as a weld zone, and b. said insert is joined to said second part by a beam welding operation that forms a conical fusion zone that is moved within the material of said insert, said insert being sufficiently thick to prevent said latter conical fusion zone from overlApping with the weld zone formed by the beam welding operation of claim 1.