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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0047939
EISBN: 978-1-62708-225-9
... Abstract Rough operation of the roller bearing mounted in an electric motor/gearbox assembly was observed. The bearing components made of low-alloy steel (4620 or 8620) and the cup, cone and rollers were carburized, hardened and tempered. The contact surfaces of these components (cup, cone...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0047935
EISBN: 978-1-62708-225-9
... was evidenced to have been melted and welded to the inner-ring raceway. It was revealed by randomly spaced welded areas on the raceways that the welding was the result of short electrical discharges between the bearing raceways and the balls. The use of an electrically nonconductive lubricant in the bearings...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001900
EISBN: 978-1-62708-225-9
... Abstract Incorrect grounding of an electric motor resulted in electric current passing through a 52100 steel ball bearing and caused multiple arcing between the rolling elements. The multiple arcing developed a pattern on the outer race known as ‘fluting’. A section of ball race outer showed...
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
... metal in the bores, and a variable pattern of residual stress. Bursting strength Electric generators Forgings Retaining rings Fe-0.65C-8Ni-8Mn-4Cr Intergranular fracture Brittle fracture The year 1954 seems to have been a peculiarly unlucky one for large electrical generators in North...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001116
EISBN: 978-1-62708-214-3
... Abstract Two failures of AP15A grade J-55 electric resistance welded (ERW) tubing in as our gas environment were investigated. The first failure occurred after 112 days of service. Replacement pipe failed 2 days later. Surface examination of the failed tubing indicated that fracture initiated...
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Published: 01 June 2019
Fig. 1 Armature for a large electric motor that failed during fabrication. The cause of failure was lamellar tearing. (a) Schematic diagram of the weld preparation and the position of the failed weld. (b) Schematic of crack initiation and propagation from the root of the weld More
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Published: 01 June 2019
Fig. 1 Low-alloy steel roller bearing from an improperly grounded electric motor that was pitted and etched by electrolytic action of stray electric currents in the presence of moisture. More
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Published: 01 January 2002
Fig. 8 Appearance of a hook crack in an electric-resistance weld. The thin white layer is a nickel coating that was applied to the fracture surface. More
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Published: 01 January 2002
Fig. 9 Appearance of an unwelded section in electric-resistance welded line pipe. More
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Published: 01 January 2002
Fig. 51 Armature for a large electric motor that failed during fabrication. The cause of failure was lamellar tearing. (a) Schematic diagram of the weld preparation and the position of the failed weld. (b) Schematic of crack initiation and propagation from the root of the weld More
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Published: 01 January 2002
Fig. 7 Low-alloy steel roller bearing from an improperly grounded electric motor that was pitted and etched by electrolytic action of stray electric currents in the presence of moisture. More
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Published: 30 August 2021
Fig. 34 Low-alloy steel roller bearing from an improperly grounded electric motor that was pitted and etched by electrolytic action of stray electric currents in the presence of moisture More
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Published: 30 August 2021
Fig. 6 Optical micrograph of a longitudinal high-frequency electric resistance seam weld showing the classic “hourglass” heat-affected zone shape around the bond line. PWHT, postweld heat treatment More
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Published: 30 August 2021
Fig. 7 Micrograph of a hook crack in an electric resistance seam weld. ID, inner diameter. Source: Ref 7 More
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Published: 30 August 2021
Fig. 8 Oblique photograph of the ruptured 32.4 cm (12.75 in.) diameter electric resistance welded pipe More
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Published: 30 August 2021
Fig. 9 Optical micrograph of fractured electric resistance seam weld near the origin. Areas of high-temperature oxidation, recent corrosion, and mechanical damage are noted. More
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Published: 30 August 2021
Fig. 39 (a) Optical micrograph of electric resistance weld at a location that did not exhibit selective seam weld corrosion. OD, outer diameter; ID, inner diameter. (b) Higher-magnification image of area indicated by rectangle in (a), showing bond line near the OD More
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Published: 30 August 2021
Fig. 22 Armature for a large electric motor that failed during fabrication. The cause of failure was lamellar tearing. (a) Schematic diagram of the weld preparation and the position of the failed weld. (b) Schematic of crack initiation and propagation from the root of the weld More
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006913
EISBN: 978-1-62708-395-9
... Abstract This article addresses electrical testing and characterization of plastics and presents a number of techniques for evaluating the electrical properties of insulating materials, with a special focus on plastics, accompanied by a list of the electrical properties of different types...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001125
EISBN: 978-1-62708-214-3
... in service, located in a region of considerable industrial pollution. The connector was sheathed with galvanized 1020 carbon steel and was located in a region of considerable industrial pollution. The galvanized sheath is not relevant. Applications High-tension electrical transmission conductor cables...