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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0048747
EISBN: 978-1-62708-229-7
... contributed to the failure. Recommendations included changing the joint design to incorporate a large-radius corner and improving fitting of the components to permit full weld penetration. Backing strips were suggested to increase weld quality, and the pipe wall thickness was increased from 8 to 9.5 mm...
Image
Published: 30 August 2021
Fig. 12 Carbon steel discharge line at a cooling tower that failed because of poor fit-up at Y-joint and poor-quality welds. (a) Original joint design of pipe connection and location of cracks. Photograph is an oblique view of a section through the weldment showing the abrupt intersection of pipe More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001522
EISBN: 978-1-62708-235-8
... casting process. Foundry practice Gating and risering Housings Permanent mold castings Porosity A357 UNS A13570 Casting-related failures A concerted research effort undertaken to improve the strength properties of cast aluminum forward housing assemblies for guided munitions may improve...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001283
EISBN: 978-1-62708-215-0
... It was recommended that the supplier improve melting techniques, including the quality of master alloys, to avoid formation of harmful segregation, oxide films, and gas voids. It was also recommended that the forging shop perform additional quality control checks by ultrasonic testing of the extruded forging stock...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0089254
EISBN: 978-1-62708-225-9
... appreciation to Mr. Randy Fach of Dove Consulting for his insights and resources on the topics of Six Sigma, TQM, CI, problem solving, and quality improvement and to Dr. David French for his review and commentary. We especially acknowledge the inspiration and contributions of Dr. Regis Pelloux, Professor...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0048020
EISBN: 978-1-62708-224-2
...Abstract Abstract A 13 mm diam 18 x 7 fiber-core improved plow steel nonrotating wire rope, brought into service as a replacement for 6 x 37 improved plow steel ropes, failed after 14 months of service on a stacker crane. The change was reported to have been caused by difficulties twisting...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003500
EISBN: 978-1-62708-180-1
... measures, significant improvements have been realized in the quality of products and systems. This requires not only an understanding of the role of failure analysis, but also an appreciation of quality assurance and user expectations. Quality and User Expectations of Products and Systems In an era...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c0045903
EISBN: 978-1-62708-223-5
... and manganese. Thus, the failure appeared to have resulted from corrosion-assisted fatigue, and the inclusion concentration in the fracture-initiated area indicated that the chemical-composition limits for sulfur and manganese would have greatly exceeded material specifications. A higher quality steel...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006753
EISBN: 978-1-62708-295-2
... that the gusset plates are always stronger than the members. Concepts of Failure Analysis and Prevention Clearly, through the analysis of failures and the implementation of preventive measures, significant improvements have been realized in the quality of products and systems. This required not only...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001909
EISBN: 978-1-62708-235-8
.... Initial peel tests resulted in sheared welds and unacceptably low loads. Figure 1 shows an example of a sheared plug weld. Note the burning that occurred on the underside of the parent material, indicating a lack of weld process control. The process was improved, however, and subsequent peel testing...
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
... are brought to their attention. As a result, the quality of field fabricated socket-welded joints has improved. Welding workmanship factors that can improve the overall reliability of joints in small-bore pipe include the following: Ensure a high-quality root pass that minimizes the number and size...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001804
EISBN: 978-1-62708-241-9
... to crack initiation, which under cyclic load propagated, leading to fatigue fracture. Unfortunately this type of problem is not rare in orthopedic plates and screws in Brazil, indicating the necessity of quality improvement in the manufacturing processes of these products. Fig. 1 Fractured screws...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001077
EISBN: 978-1-62708-214-3
... depth of 0.89 to 1.1 mm (0.035 to 0.045 in.) and a hardness value of 90 to 91.5 HR15N. The core hardness ranged from 38 to 41 HRC. Performance of Other Parts in Same or Similar Service The service performance of this type of high-quality gear is usually excellent. However, there have been...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001041
EISBN: 978-1-62708-214-3
..., no prior service history was available. Specimen Selection Sections were removed from each of the cracked cross members to compare their chemical composition and tensile properties to specification requirements. Metallographic samples were removed from each to determine weld quality, soundness...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001491
EISBN: 978-1-62708-217-4
... the insulator. This procedure plus tighter machining tolerances improved bond quality. As a result of the convergent insulator failures of S/N 014R and S/N 018, a major question needed to be answered. Did the manufacturing changes cause the cracks? In all cases except for S/N 014R and S/N 018, convergent...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001118
EISBN: 978-1-62708-214-3
... some details of the fracture surface could be examined optically, improved photographs were obtained via scanning electron microscopy (SEM). In spring 1, the fracture was located nearly opposite the joint where the spring was intertwined to form the loop; that is, the joint connection...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001695
EISBN: 978-1-62708-229-7
... of surveillance coupons from the basins since mid-1996 as changes implemented in the basins have significantly improved the water quality and virtually mitigated the pitting corrosion. This has permitted longer exposure time between coupon withdrawals. Factors Affecting the Corrosion in SRS Basins...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001394
EISBN: 978-1-62708-234-1
... specification and is apparently a proprietary alloy. High chromium-nickel alloys of this composition mostly find application as heat-resisting alloys. To those of a lower chromium and/or nickel content an addition of molybdenum is usually made in order to improve their corrosion resistance. The pump had...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003520
EISBN: 978-1-62708-180-1
... problems and improve quality control. Fortunately, improvements have been made since then, and examination methods have improved. This article is an update of Ref 1 . Many of the fundamentals remain the same, but they warrant repeating here and in other publications or other articles in this Volume...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001793
EISBN: 978-1-62708-241-9
... is cheaper and easy to maintain, but a poor dynamic actuator. The CPP design, on the other hand, is an alternative for improved efficiency, especially in the need of a wide range of thrust and load levels, while maintaining an optimum shaft speed, as in the case of diesel or gas turbines. Furthermore...