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Weldments

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0048091
EISBN: 978-1-62708-224-2
... welding. The metal was identified to be 1020 steel. It was indicated by the coarse as-rolled structure (grain size of ASTM 00 to 4) of the base metal that the weldment (stop block and guide) had not been normalized. The brittle failure was evaluated to have been initiated at a metallurgical and mechanical...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001328
EISBN: 978-1-62708-215-0
... showed intergranular cracks originating at weld toes and filled with oxidation product, which precluded determination of the cracking mechanism. All weldments exhibited high degrees of secondary precipitates, with original fabrication welds exhibiting higher apparent levels than repair welds. SEM/EDS...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001280
EISBN: 978-1-62708-215-0
... Abstract An HK-40 alloy tubing weld in a reformer furnace of a petrochemical plant failed by leaking after a shorter time than that predicted by design specifications. Leaking occurred because of cracks that passed through the thickness of the weldment. Analysis of the cracked tubing indicated...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001669
EISBN: 978-1-62708-229-7
... outlet temperature of 566 deg C, the 11.4 cm thick header had operated for approximately 187,000 h at the time of the failure. Discussion focuses on the results of a metallographic examination of boat samples removed from the longitudinal seam weldment in the vicinity of the failure and at other areas of...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001086
EISBN: 978-1-62708-214-3
... joints Weldments 301 UNS S30100 Intergranular fracture Intergranular corrosion Two Z-shape impeller vanes failed. The vane material was 1 4 -hard type 301 stainless steel. The vanes were of two-piece construction, with a longitudinal weld. By design, there was a 6.4 mm...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001072
EISBN: 978-1-62708-214-3
... failure was attributed to stress-corrosion cracking caused by a corrosive atmosphere. Chemical processing equipment Weldments ASTM A294 Stress-corrosion cracking Radial cracking occurred adjacent to 11 vanes in a 19-vane ASTM A-294 impeller. The vanes were fillet welded to both...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001052
EISBN: 978-1-62708-214-3
..., and no further cracking occurred. Aircraft engines Bellows Exhaust systems Flexible couplings Weldments 321 UNS S32100 Fatigue fracture The flexible bellow in a type 321 stainless steel welded exhaust hose assembly exhibited poor resistance to cracking and failed...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001129
EISBN: 978-1-62708-214-3
... prevented the failure. Heat-affected zone Low-cycle fatigue Welded joints Welding parameters Weldments Fe-0.25C-1.24Mn-0.62Cr-0.24Mo Fatigue fracture Joining-related failures A 45 Mg (50 ton) rail crane bolster made from 0.25C-1.24Mn-0.62Cr-0.24Mo cast steel failed. A...
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
... welds alleviated the problem. Automotive components Chassis Fillet welds Frames Low-cycle fatigue Weldments SAE 950X Joining-related failures Fatigue fracture Two truck cross members fabricated from SAE 950X plate, comprising a formed channel section and an internal...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001309
EISBN: 978-1-62708-215-0
.... Inspection intervals were devised to avoid future problems. Bending fatigue Crack propagation Finite element method Mechanical properties Stress concentration Tubing Weldments 1008 UNS G10080 Fatigue fracture A significant percentage of the approximately 300 1982-model-year...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001353
EISBN: 978-1-62708-215-0
... low toughness. It was recommended that fully killed carbon steel with a fine-grain microstructure be used. Redesign of the flap to remove the step in the forging that acted as a notch was also recommended. Electric power generation Forgings Marine environments Weldments Fe-0.10C Fe-0.19C...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001327
EISBN: 978-1-62708-215-0
.... Nuclear reactor components Pipe fittings Weldments ASME SA106-B Corrosion fatigue During a refueling outage at a pressurized water reactor (PWR), feedwater reducers to all four steam generators were replaced. Three of the four piping reducers showed indications of flaws when...
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
... torsional rigidity with the consequent development of excessive stresses in the welds at the junctions of the bars with the sleeve, the torque being of a fluctuating character due to the impulses imparted by the engine. Dynamics Electric motors Loads (forces) Motor rotors Weldments Welded steel...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001837
EISBN: 978-1-62708-241-9
... containing cracks for macro-examination. Transverse face and capping face both were grinded up to 400 grit size and etched in 2% nital to reveal different regions of the weldment. Special care was taken to avoid excessive heating of required surface during grinding. Figure 6 shows the macrograph of the...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001352
EISBN: 978-1-62708-215-0
... (300°F) before welding and postheating to 700°C (1290°F), followed by cooling at a rate of 38°C/h (68°F/h). The presence of several blowholes in the weldment indicated use of poor welding procedures. Improper heat treatment of the martensitic stainless steel/austenitic stainless steel weld at the...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001350
EISBN: 978-1-62708-215-0
... crack propagation ( Fig. 4 ). Fig. 4 Outside surface of the shell at position A of Fig. 2 Figure 4 shows the outside surface of the shell at position A of Fig. 2 . Interconnecting drill marks are visible at the top, with weldment at the bottom. The lower crack (marked “l”) followed the...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0048814
EISBN: 978-1-62708-229-7
... with a backing strip. The backing was back gouged off, and the weld was completed from the inside with E8018-C3 electrodes by the shielded metal arc process. The weld was continuously stress relieved for 12 h at 540 °C (1000 °F). Hardness traverses on the weldments suggested that the actual heat...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001348
EISBN: 978-1-62708-215-0
... sensitized microstructure resulted in SCC in the presence of chloride ions from the coastal environment. Many such stainless steel weldments that were not sensitized had not exhibited failures in a coastal environment for much longer durations. After visual and low-magnification microscopic...
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
... , Volume 6 of Metals Handbook (9th ed.), 1983), and the ASM Committee on Failure Analysis of Weldments (for Failure Analysis and Prevention , Volume 10 of Metals Handbook (8th ed.), 1975). ...
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
...-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 walls and the voids and crevices in the weld metal. (b) Improved joint design. Dimensions given in inches...