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direct-drive welding

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Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001351
EISBN: 978-1-62708-215-0
.... Fig. 7 Photomicrograph of a through-crack originating at the bottom of a pit and extending across the thickness of a convolute Abstract Abstract A number of AISI 347 stainless steel bellows intended for use in the control rod drive mechanism of a fast breeder reactor were found...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001249
EISBN: 978-1-62708-236-5
.... The play between the shaft and the internal wall was ca. 0.1 mm. The pure water flowing through this gap can be considered as a lubricant. The lubrication broke down as a result of an unknown fault and the drive shaft came into direct contact with the internal wall of the flange. On fracture...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001594
EISBN: 978-1-62708-229-7
..., and a smooth transition of the weld metal to the base metal at both weld toes. When a fatigue crack propagates from the weld toe, the fracture surface is flat, transgranular, and burnished. If arrest marks are noted, the curvature of the arrest marks and the fracture flow line direction will indicate...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c9001424
EISBN: 978-1-62708-233-4
.... In the second case the machine was a 200 kW alternator, direct-driven by a diesel engine running at 750 rpm. Both the foregoing failures reveal the same basic weakness, i.e., insufficient rigidity when subjected to variations or reversals of torque. In the first case, the bars welded to the arms were...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001808
EISBN: 978-1-62708-180-1
..., as well as how their alignment may be affected by deflections or distortions that can occur as a result of mechanical loads, shock, vibrations, or thermal gradients, should be considered. The method of connecting the driving or driven member to the shaft, such as press fitting, welding, or use...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001442
EISBN: 978-1-62708-221-1
... attached to the back driving plate and the front or eye plate by double fillet welds. Examination of several of the pieces of the disrupted impeller — not all were recovered — indicated that the majority of the vanes had become detached where they were welded to the plates, in the manner seen...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001820
EISBN: 978-1-62708-180-1
.... Another failure that occurred in 915-mm (36-in.) outside-diameter × 10-mm (0.406-in) wall-thickness API, grade X52, pipe was initiated by sabotage. The fracture propagated through 2.5 pipe lengths in one direction as a cleavage fracture and, upon crossing a girth weld, turned to shear and arrested...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c0091394
EISBN: 978-1-62708-227-3
...: Piping Material: Type 316/316L stainless steel, schedule 40, 64 mm (2.5 in.) diam and larger pipe was used. Pitting Damage: Observed through pipe wall directed from interior to exterior. Most pits were leaking in the HAZ at the weld joints. Some pitting was found midlength at the bottom of the pipe...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001308
EISBN: 978-1-62708-215-0
...-flange crack then propagated down to the rail web until the crack-driving stresses (residual stresses in the tangential direction) were relieved. Because the cracks initiated from a heat treatment given to the entire rail, other quench cracks probably existed. Nondestructive inspection of the rail...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c9001549
EISBN: 978-1-62708-224-2
...Abstract Abstract Crane collapse due to bolt fatigue and fatigue failure of a crane support column, crane tower, overhead yard crane, hoist rope, and overhead crane drive shaft are described. The first four examples relate to the structural integrity of cranes. However, equipment such as drive...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.petrol.c9001603
EISBN: 978-1-62708-228-0
... Microstructure of the fusion zone revealed a distinct ferrite band across the through-thickness direction of the weld joint. Crack initiation and propagation occurred exclusively through the ferrite bands. Extensive decarburization within the fusion zone may have led to the formation of the ferrite band...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003539
EISBN: 978-1-62708-180-1
... and geometry, extensive propagation in these materials occurs on alternate crystallographic planes such that growth follows a zigzag or serrated faceted pattern, on average normal to the direction of fluctuating tension. The stage I propagation mechanism is favored in materials that exhibit planar slip...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001536
EISBN: 978-1-62708-229-7
... Piping in a Boiling Water Reactor 4.2 Failure of Canopy Seal Welds in Adapter Tube Assemblies in a PWR Control Rod Drive Head 4.3 Thermal Fatigue of a BWR Recirculation-Pump Shaft 4.4 Nickel Leaching in Pump Seal Wear Rings Failed components from nuclear power-generating stations have been...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006776
EISBN: 978-1-62708-295-2
... to final fracture. Depending on loading and geometry, extensive propagation in these materials occurs on alternate crystallographic planes such that growth follows a zigzag or serrated faceted pattern, on average normal to the direction of fluctuating tension. The stage I propagation mechanism...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0047879
EISBN: 978-1-62708-234-1
...-affected zone of the forged steel shaft. Worn and smeared metal on both mating surfaces indicated that the stub shaft had continued to rotate after it had fractured. Inspection of the PVC reactor revealed that the drive coupling between the shaft and motor was purposely misaligned 1.3 mm (0.05...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001775
EISBN: 978-1-62708-241-9
... provided a caustic solution (NaOH) to remove HCl from the stream, before the latter was directed to a burner. Metallographic examination showed that the cracks were intergranular and were frequently branched. Although nominal chemical composition of the component was found within the specified range...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001815
EISBN: 978-1-62708-180-1
... to another element in the same unit or to another working unit either in the same plane and direction or in a completely different plane or direction. The force due to this transmission may either increase or decrease in magnitude from one element to the next. Design and function are closely associated...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001528
EISBN: 978-1-62708-219-8
... the material yield strength. However, the final fabrication stresses in the finished tank are dependent on the clamping forces applied during welding, and these cannot be calculated. Also, the tank is subjected to constant vibration associated with the flowing water. The direct contact hot water system...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003513
EISBN: 978-1-62708-180-1
... in the electric power industry both in Great Britain as the R6 criteria ( Ref 3 ) and in the United States as both the FAD ( Ref 4 ) and the deformation plasticity failure assessment diagram (DPFAD) ( Ref 5 ). Both the R6 and DPFAD approaches use the J -integral criteria for fracture-driving force and resistance...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001847
EISBN: 978-1-62708-241-9
... for a long time. If the fracture of the sleeve first occurred, the sleeve would still keep turning with the main shaft under driving of the turbodisk [ 4 ]. The matched fracture surfaces would rub each other and then the polished wear marks should be exhibited on the fracture surface. However, beach marks...