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Coils (windings)

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001705
EISBN: 978-1-62708-234-1
... Abstract The working fluid of a hypersonic wind tunnel is freon 14 heated in molten-metal-bath heat exchangers. The coils of the heaters have failed several times from various causes. They have been replaced each time with a stainless steel deemed more appropriate, but they continue to fail...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001487
EISBN: 978-1-62708-234-1
... Abstract Copper shortening has been found to occur in the rotor windings of turbo alternators and takes the form of a progressive reduction in the length of the coils leading to distortion of the end windings. The trouble results from the high loading which develops between successive layers...
Image
Published: 01 June 2019
them. A tightly wound, tightly strapped coil is extremely strong, with each winding supported by its neighbors. However, once a coil is loosened and windings telescope, they are very vulnerable to damage. Unwinding alone, with no damage, can result in rejection because the coil will not fit into pipe More
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001119
EISBN: 978-1-62708-214-3
... initiated from the spring inside coil surface. Examination of the fracture surface using scanning electron microscopy showed no evidence of fatigue. Final fracture occurred in torsion. X-ray diffraction analysis revealed high inner-diameter residual stresses, indicating inadequate stress relief from spring...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c0051294
EISBN: 978-1-62708-221-1
.... The solution was to increase the stress relieving temperature to reduce the residual stresses from coiling and hence improve fatigue performance. This may give rise to earlier fatigue failure in the wind-up direction, of course, but the net effect is to prolong the tine life significantly. Acknowledgments...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001686
EISBN: 978-1-62708-220-4
... of failure was low flow transient operation. Coils (windings) Electric power generation Vaporizers ASME SA106 B Transgranular fracture Thermal fatigue fracture Introduction A metallurgical failure analysis was performed on a failed vaporizer coil removed from a horizontal forced...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001338
EISBN: 978-1-62708-215-0
... tubes Leakage Copper Pitting corrosion Background Copper tubes from the cooler assemblies of a large air-conditioning unit exhibited leakage upon installation of the unit. Specimen Selection Two 46 cm (18 in.) long tubes from newly installed chilled water coils were sent...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001608
EISBN: 978-1-62708-236-5
... on the tightest. In turn each will fail. Straps are made of thin steel and a little corrosion can significantly weaken them. A tightly wound, tightly strapped coil is extremely strong, with each winding supported by its neighbors. However, once a coil is loosened and windings telescope, they are very vulnerable...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001685
EISBN: 978-1-62708-235-8
... microscopy and X-ray imaging of fracture surfaces revealed pockets of inclusions at the crack origins. In addition, tests were conducted to evaluate the detrimental effects of internal hydrogen on ductility and crack initiation in this alloy. Coils (windings) Electric power generation Vaporizers U...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001443
EISBN: 978-1-62708-235-8
... in this case could have been drawn without failure. Failure in service was due to overheating resulting from the inability of the conductor to carry the current where its cross section was reduced by the presence of a cavity. Another failure of a conductor occurred in one of the field coils of a direct-current...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0048147
EISBN: 978-1-62708-234-1
... in Fig. 1(a) fractured at the two locations indicated by the arrows. The spring had been formed from hardened-and-tempered carbon steel strip and subsequently subjected to a phosphating treatment. In the normal manufacture of these springs, winding to solid is performed to take out set (provide stable...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001811
EISBN: 978-1-62708-180-1
.... Fully quenched-and-tempered low-carbon steels and similarly treated alloy steels are also used for such applications. Miscellaneous Equipment Lifting booms, coil hooks, lugs and rings, boxes and containers, trunnions, and miscellaneous attachments should be made of either normalized or quenched...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001725
EISBN: 978-1-62708-229-7
.... From metallurgical evidence it was concluded that damage originated in the rupture of a retaining ring at the outboard end of the generator. There are two such rings, one at each end of the generator. These rings hold the return loops of the windings in place as shown in Fig. 1 . These retaining rings...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006836
EISBN: 978-1-62708-329-4
... and were submitted for laboratory analysis. The springs were from a current production lot and had been made from air-melted 6150 pretempered steel wire. The springs were 50 mm (2 in.) in outside diameter and 64 mm (2.5 in.) in free length, had five coils and squared-and-ground ends, and were made of 5.5...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001516
EISBN: 978-1-62708-234-1
... the two rails of a thin film head which crashed and wiped out all data. Note the pole piece and the coil windings. The two rails are produced by machining heads put of a big wafer of a ceramic material calcium titanate in this case. A composite ceramic of alumina and titanium carbide is also used...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006830
EISBN: 978-1-62708-329-4
... used for such applications. Materials for Miscellaneous Lifting Equipment Lifting booms, coil hooks, lugs and rings, boxes and containers, trunnions, and miscellaneous attachments are generally made of either normalized or quenched-and-tempered fully killed fine-grained steels. For equipment...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001813
EISBN: 978-1-62708-180-1
... manufacture of these springs, winding to solid is performed to take out set (provide stable torque output) before phosphating. Although this operation creates residual tensile stresses in the interior surfaces of the coils, phosphating of this spring had not produced sufficient hydrogen absorption to cause...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006764
EISBN: 978-1-62708-295-2
...-transmission two sides or reflection mode single side. Good sensitivity in acoustically clear material All metals and alloys, sintered carbides, glass and ceramics, rubber, structural plastics, concrete Electromagnetic testing Measures impedance of coil close to conductive material. Coil impedance changes...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001768
EISBN: 978-1-62708-241-9
... Investigation of Locked Coil Wire Rope samples Fractured During Service , Steel India 23 ( 2 ), 40 – 42 ( 2000 ) 8. Ray A. , Dhua S.K. , Mishra K.B. , Jha S. , Microstructural manifestation of fractured Z-profile steel wires on the outer layer of a failed locked coil wire rope...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001724
EISBN: 978-1-62708-234-1
... the return loops of the windings at either end of the rotor shaft as shown in the cross section of Fig. 1 and the photograph, Fig. 2 . Fig. 1 Sketch of End of Rotor Shaft in 100,000-Kw. Generator Showing End Bell Whose Function Is to Hold in Place Against Centrifugal Force the End Turns...