Evaluation of Stellite 12 on ASTM A890 Grade 6A per ITT Material Designation #6787 and ASME IX QW 453
OD Overlay 6.35” OD, 4.850” ID, X 3.5” Sleeve ID Overlay 5.195 OD, 4.695” ID X 1” Ring
Liquid penetrant examination showed no relevant, linear or rounded indications.
The hardness of the ring and sleeve was with the Ring and Sleeve is within 43-53 Rc as defined in ITT 6787
At 5X both the ID and OD welds there were no indications of incomplete fusion at either the base metal / In 625 or In 625/ Stellite 12 interfaces. There were no cracks observed in the heat affected zone or base metal.
In order to provide the greatest flexibility, the overlays for the ID and OD were applied with different torches. Liquid penetrant inspection was performed at the welded, proof welded, rough machine and finished size. The hardness’s of both systems were the same. 50X examination of both samples display acceptable overlays with good bond integrity as well as the soundness of both procedures.