Fatigue Fracture of a Gas-Turbine Inner-Combustion-Chamber Case Assembly Because of Unfused Weld Metal and Undercuts
The case and stiffener of an inner-combustion-chamber case assembly failed by completely fracturing circumferentially around the edge of a groove arc weld joining the case and stiffener to the flange. The assembly consisted of a cylindrical stiffener inserted into a cylindrical case that were both welded to a flange. The case, stiffener, flange, and weld deposit were all of nickel-base alloy 718. It was observed that a manual arc weld repair had been made along almost the entire circumference of the original weld. Investigation (visual inspection, 0.5x macrographs, and 10x etched with 2% chromic acid plus HCl views) supported...
Fatigue Fracture of a Gas-Turbine Inner-Combustion-Chamber Case Assembly Because of Unfused Weld Metal and Undercuts, ASM Failure Analysis Case Histories: Power Generating Equipment, ASM International, 2019, https://doi.org/10.31399/asm.fach.power.c0047621
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