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Undercutting

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0089774
EISBN: 978-1-62708-235-8
... at the undercut locations. Without the excessive residual stress, the shaft dimensions appeared ample for the service load. Recommendations included applying the fillet weld with more care to avoid undercutting. The residual stresses could be minimized by pre-weld and post-weld heat application. Fillet...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.pulp.c0047529
EISBN: 978-1-62708-230-3
... in a position to project beyond the fully beveled top edge of the shell. The projecting edge of the ring fitted against a deep undercut on the inner corner of the rim of the head. The internal 90-deg angle in this undercut was sharp, with almost no fillet. A bevel from the lower edge of the undercut...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0048714
EISBN: 978-1-62708-229-7
...) on the tube surfaces during the cooling process. Air flow over the tubes reversed direction every 585 mm as a result of baffling placed in the heat exchangers. An uneven ridgelike thinning and perforation of the tube wall on the leeward side of the tube was revealed by visual examination. Undercut pits...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0047793
EISBN: 978-1-62708-217-4
... in the impeller and the relatively smooth cavities and undercutting of the flank on this side indicated that the damage was caused by an erosion or abrasion mechanism. A relatively smooth worn area was formed at the center of each tooth due to an abrasive action and an undulating outline with undercutting...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0048356
EISBN: 978-1-62708-229-7
... specifications. Investigation supported the conclusion that a crevice-like undercut was likely the primary cause of the fracture and that the source of the necessary fluctuating stress was tube vibration inherent in boiler operation. Recommendations included magnetic-particle inspection of the remaining water...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001320
EISBN: 978-1-62708-215-0
...Abstract Abstract Severe pitting was found on the internal surfaces of SA-210 Grade C waterwall tubing of a coal-fired boiler at a cogeneration facility. Metallographic examination showed the pits to be elliptical, having an undercut morphology with supersurface extensions,. a type of pitting...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c0048691
EISBN: 978-1-62708-220-4
...Abstract Abstract AISI type 410 stainless steel tube bundles in a heat exchanger experienced leakage during hydrostatic testing even before being in service. The inside surfaces of the tubes was observed to have been pitted. Chloride-ion pitting was revealed by the undercutting in the cross...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0047621
EISBN: 978-1-62708-229-7
..., stiffener, and flange and more skillful welding techniques to avoid undercutting and unfused interfaces. Arc welding Combustion chamber Flanges Gas turbine engines Pipe fitting Undercuts Welding defects Inconel 718 (Nickel-base superalloy) UNS N07718 Fatigue fracture Joining-related failures...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c0047570
EISBN: 978-1-62708-221-1
... the elliptical section of the pipe. The toe of the weld and the adjacent undercut were stress raisers that determined the point of major crack origin. Under residual stress, the internal point of incomplete fusion also initiated additional cracks. Recommendations included ensuring a proper fit between...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0089738
EISBN: 978-1-62708-235-8
... the conclusion that the crack in the header tube was the result of a stress concentration at the toe of the weld joining a doubler collar to the tube. The stress concentration was caused by undercutting from poor welding technique and an unfavorable joint design that did not permit a good fit-up. Recommendations...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001287
EISBN: 978-1-62708-215-0
... marks are visible undercut at the end of the 38 mm ( 1 1 2 in.) diam A semicircle approximately 33 mm (1.3 in.) in diameter with a flat surface of rough texture on which striations are visible A semicircle of the same approximate diameter as area 3 with an uneven fibrous surface...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003509
EISBN: 978-1-62708-180-1
... indications that are found by nondestructive testing methods. Surface features that are causes for rejection include: Excessive mismatch at the weld joint Excessive bead convexity and bead reinforcement Excessive bead concavity, underfill, and undersized welds Sharp undercut and overlap...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006808
EISBN: 978-1-62708-329-4
... Schematic of defects and discontinuities in welded joints Fig. 4 Weld discontinuities affecting weld shape and contour. (a) Undercut and overlap in a fillet weld. (b) Undercut and overlap in a groove weld. (c) and (d) Underfill in groove welds Fig. 5 Identification of cracks according...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c0089752
EISBN: 978-1-62708-219-8
..., such as deep valleys, grooves, and undercuts, which served as notches and stress raisers, at the toe of the weld. Examination of the third fracture at the shop weld disclosed that areas in the HAZ and at the toe of the weld had hardness levels as high as 34 HRC. When test welds were made on metal preheated...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.pulp.c9001393
EISBN: 978-1-62708-230-3
... and the undercutting that was present in the vicinity. Assuming a modest factor of 1.5, the maximum skin stress would be in the region of 15.0 tons per sq. in., i.e. in excess of the yield point of the material. It is known that the vessel was tested hydraulically to 1.5 times the working pressure on several occasions...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001817
EISBN: 978-1-62708-180-1
... magnification view of a pit showing the depth of attack and thickness of the corrosion deposit. 28×. (c) Micrograph showing the intergranular nature of the attack and undercutting of metal particles. Etched with ammonium persulfate. 110× Fig. 14 Type 321 stainless steel heat-exchanger bellows...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0048060
EISBN: 978-1-62708-224-2
... fillet was machined at the change in diameters of the shank. Also, the nut was redesigned to extend beyond the threaded portion to relieve the stresses (Improved design, Fig. 1 ). Undercutting the last thread, using large-radius fillets, and ensuring that all crane hooks were properly normalized...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c0048702
EISBN: 978-1-62708-220-4
... of attack and thickness of the corrosion deposit. 28×. (c) Micrograph showing the intergranular nature of the attack and undercutting of metal particles. Etched with ammonium persulfate. 110× Most copper alloys depend on the formation of a protective oxide scale for corrosion protection. When...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.petrol.c9001638
EISBN: 978-1-62708-228-0
... cases, undercut ( Fig. 1 ). No obvious scale was present on the inside surface of the line. Spectrographic analysis and mechanical tests confirmed that the line conformed to the requirements for UNS N08810 ( Table 1 ). Fig. 1 The edges of the damaged areas of the failed section of the transfer...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0047632
EISBN: 978-1-62708-235-8
... overheating. A review of the production procedures indicated that preheating for welding was the only operation in which local overheating of both the boss and dome could have occurred. Also, a substantial undercut was found on the inside of the weld, suggesting a higher-than-normal adjacent base-metal...