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Heat shields

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001508
EISBN: 978-1-62708-236-5
...Abstract Abstract New type 321 corrosion-resistant steel heat shields were cracking during welding operations. A failure analysis was performed. The cause was found to be chloride induced stress-corrosion cracking. Packaging was suspected and confirmed to be the cause of the chloride...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001043
EISBN: 978-1-62708-214-3
...Abstract Abstract A 76 mm (3 in.) type 304 stainless steel tube that was used as a heat shield and water nozzle support in a hydrogen gas plant quench pot failed in a brittle manner. Visual examination of a sample from the failed tube showed that one lip of the section was eroded from service...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001145
EISBN: 978-1-62708-217-4
.... The breech chamber and cartridge chamber are joined by means of a bayonet closure. The cartridge is fired electrically and the hot gases generated exit through the exhaust port on the top of the breech chamber. To prevent overheating of the chamber dome there are two Inconel heat shields welded inside...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0047645
EISBN: 978-1-62708-229-7
... cracks to form and propagate in tension under the thermal stresses created by the repair-weld heat input. The crack resulted from contamination and embrittlement of a repair weld that had received inadequate gas shielding. Thermal stresses cracked the oxide-rich layer that formed. The gas-shielding...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0091655
EISBN: 978-1-62708-229-7
... of the Inconel 600. There were very few matrix precipitates immediately adjacent to the fusion line of the heat shield attachment weld; this condition was true of the entire HAZ near the root pass. The cracking generally initiated in the HAZ some distance away from the tip of the tight crevice and, in its early...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c0047508
EISBN: 978-1-62708-221-1
...-to-sulfur ratio and be in a normalized condition, low-hydrogen electrodes and welding practices should be used, all corners should be generously radiused, the welds should be inspected and ground or dressed to minimize stress concentrations, postweld heating is advisable, and radiographic and penetrant...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0047641
EISBN: 978-1-62708-235-8
... contamination. Contaminants Gas tungsten arc welding Heat affected zone Oxygen Stress concentration Thermal stresses Ti-6Al-4V UNS R56406 Joining-related failures A Ti-6Al-4V alloy pressure vessel failed during a proof-pressure test, fracturing along the center girth weld. The pressure vessel...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001647
EISBN: 978-1-62708-235-8
... containers and were also intended to identify any gas contaminant or pressure transient that might lead to porosity. Two welds were made with increased heat input, accomplished through placing a second closure weld on top of the first weld, to maximize the likelihood of detecting any contaminant released...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c0091362
EISBN: 978-1-62708-220-4
.... 200× Fig. 3 Intergranular corrosion of the inside surface heat-affected zone of E-Brite stainless steel adjacent to the weld fusion line. Electrolytically etched with 10% oxalic acid. 100× The evidence indicated weldment contamination; therefore, effort was directed at finding...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001632
EISBN: 978-1-62708-234-1
... as a means for determining surface temperature during operation. In practice, the thermocouples indicated a temperature much higher than that of the surface of the window due to heating of the thermocouples and the pads by the protons and because the heat transfer path to the coolant was poor. The 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
... for weldment failure include: Inappropriate joint design Improper weld size Unfavorable heat input Improper preweld and postweld heating Improper fit-up Incorrect parent (base) material composition Incorrect filler composition Embrittlement during welding Unfavorable cooling rate...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001560
EISBN: 978-1-62708-217-4
... in the steel and the heat shields in the chamber are Inconel, a Ni base alloy containing Cr. Elements with an atomic number of less than nine such as hydrogen, nitrogen, and oxygen cannot be detected with this system. From the x-ray powder diffraction pattern obtained on the residue, the compounds...
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
... 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-treatment temperature may have been less...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0048331
EISBN: 978-1-62708-229-7
... corrosion. The thinned tubes were reinforced by pad welding. Type 304 stainless steel shields were welded to the stainless steel portions of the top reheater tubes and were held in place about the chromium-molybdenum steel portions of the tubes by steel bands. Coal dust Heat exchanger tubes Thinning...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c0048087
EISBN: 978-1-62708-231-0
.... Heat affected zone Martensite Shielded metal arc welding Vibrations Welded joints Welding parameters 1020 1050 UNS G10200 UNS G10500 Fatigue fracture Figure 1(a) shows a hoist carriage tram-rail assembly fabricated by shielded metal arc welding the leg of a large T-section 1020 steel...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003570
EISBN: 978-1-62708-180-1
... than 12% Cr steel. All of the commonly used blade alloys are protected from liquid-droplet impingement in the last blade row by local hardening (by flame or induction heating), brazed-on shields of Stellite 6B, or welded-on hard facing. Helicopter rotors are made of titanium sheet laid over...
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
... to location in weld and base metal. 1, crater crack in weld metal; 2, transverse crack in weld metal; 3, transverse crack in heat-affected zone; 4, longitudinal crack in weld metal; 5, toe crack in base metal; 6, underbead crack in base metal; 7, fusion-line crack; 8, root crack in weld metal; 9, hat cracks...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0048154
EISBN: 978-1-62708-235-8
... at the origin. The other half of the fracture was not available, but it was assumed that a drop of molten metal landed at the origin. The degree of heating involved would lessen or eliminate the compressive stress produced by shot peening, and contraction of the surface in contact with the tightly adherent weld...
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
.... Although no cracks were found when the welds were visually inspected, X-ray radiography showed small discontinuous surface cracks adjacent to the weld bead in the heat affected zone. Further investigation, including optical microscopy, microhardness testing, and residual stress measurements, revealed...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001447
EISBN: 978-1-62708-235-8
...Abstract Abstract Hydrogen embrittlement is the brittleness affecting copper and copper alloys containing oxygen which develops during heat treatment at temperatures of about 400 deg C (752 deg F) and above in an atmosphere containing hydrogen. The phenomenon of hydrogen embrittlement of copper...