ASM Failure Analysis Case Histories: Air and Spacecraft
Failure of a Laser Beam Attachment Weld Because of Inadequate Penetration in Joint Between Cooling Components for a Jet Turbine Blade
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Published:2019
Abstract
Airfoil-shape impingement cooling tubes were fabricated of 0.25 mm (0.010 in.) thick Hastelloy X sheet stock, then pulse-laser-beam butt welded to cast Hastelloy X base plugs. Each weldment was then inserted through the base of a hollow cast turbine blade for a jet engine. The weldments were finally secured to the bases of the turbine blades by a brazing operation. One of the laser beam attachment welds broke after a 28-h engine test run. Exposure of the fracture surface for study under the electron microscope revealed the joint had broken in stress rupture. Failure was caused by tensile overload...
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Member Sign InFailure of a Laser Beam Attachment Weld Because of Inadequate Penetration in Joint Between Cooling Components for a Jet Turbine Blade, ASM Failure Analysis Case Histories: Air and Spacecraft, ASM International, 2019, https://doi.org/10.31399/asm.fach.aero.c0047720
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