Integral backing ring for stub shaft weld repairs of rotating equipment and related method

摘要

A stub shaft section (16) adapted to be welded to a re-used end portion of a rotor shaft (12), the stub shaft section (16) including a hollow cylindrical member having a substantially uniform inner diameter and first chamfered end (18) adapted to form one side of a substantially V-shaped weld groove (22), and an integral backing ring (20) extending axially beyond the chamfered end (18), the backing ring (20) having a circumferential recess (28) in a radially outer surface (30) thereof. A related method of replacing a stub shaft on an end of a rotor shaft comprising: (a) providing a new stub shaft (16) with a first chamfered end (18) and an integral backing ring (20); (b) aligning the first chamfered end (18) with a second chamfered end (14) on the rotor shaft (12), with the integral backing ring (20) overlapping the second chamfered end (14), and with the first and second chamfered ends (18), (14) forming a substantially V-shaped weld groove (22), with the integral backing ring (20) overlapping the second chamfered end (14); (c) filling the V-shaped groove (22) with weld material (32); (d) welding the stub shaft (16) to the rotor shaft (12); and (e) machining the integral backing ring (20) away from the stub shaft (16).