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Penetration

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0047720
EISBN: 978-1-62708-217-4
... by tensile overload from stress concentration at the root of the laser beam weld, which was caused by the sharp notch created by the lack of full weld penetration. Radiographic inspection of all cooling-tube weldments was made mandatory, with rejection stipulated for joints containing subsurface weld-root...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001482
EISBN: 978-1-62708-229-7
... Abstract Penetration by molten copper occurred in the economizer of a large water-tube boiler. A cross section through a weld and the crack in the tube revealed a crack was an intergranular fissure. Small fissures of the same type also extended from its flanks. The main fissure was filled...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0047756
EISBN: 978-1-62708-235-8
... extremities of a granular gold-tinted surface region adjacent to the tube-to-sleeve brazed joint and extending circumferentially were revealed by microscopic examination. Embrittlement of the tube caused by molten braze metal penetration along grain boundaries was evidenced by micrographs of a granular...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001440
EISBN: 978-1-62708-235-8
... was examined microscopically. This revealed that the crack was associated with intergranular penetration by molten metal. The microstructure in general was indicative of a good-quality mild steel. It was evident from that solder that was responsible for the penetration and that fused brass from the hand wheel...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0048782
EISBN: 978-1-62708-235-8
... Abstract A steam accumulator, constructed with 10.3 mm thick SA515-70 steel heads and an 8 mm thick SA455A steel shell, ruptured after about three years of service. The accumulator was used in plastic molding operations. An extensive lack of weld penetration in this the head-to-shell girth weld...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001483
EISBN: 978-1-62708-225-9
... deg C (1981 deg F), molten metal came into contact with the bolt, into which it penetrated along the grain boundaries, culminating in rupture. Bolts Copper Liquid metals Overheating Penetration Steel bolt Liquid metal induced embrittlement Intergranular fracture The head portion only...
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
... of the undercut, which was an inherent stress raiser. Recommendations included revised joint design to ensure full root penetration. Fillet welds Heat affected zone Joint design Papermaking Shells (structural forms) Steam preheaters Weld defects Welded steel (Steel, general) Joining-related failures...
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Published: 01 June 2019
Fig. 6 Four typical pit types found on slugs: (a) shallow corrosion penetration of core, (b) deeper penetration, (c) vertical penetration of core, (d) bubble formed under aluminum cladding. More
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Published: 01 June 2019
Fig. 3 Partial penetration weld specified by revised horizontal plate design. More
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Published: 01 June 2019
Fig. 7 Examples of corrosion and poor penetration respectively of the welds. 20 × More
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Published: 01 June 2019
Fig. 8 Examples of corrosion and poor penetration respectively of the welds. 20 × More
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Published: 01 June 2019
Fig. 21 SEMs showing crack and corrosion front penetration into the base metal More
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Published: 01 June 2019
Fig. 3 Sulfidation penetration into IN-690 liner approximately 50 to 250 μm deep. The sulfidized weakened structure of the alloy has led to cracking. More
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Published: 01 June 2019
Fig. 5 Area of sharp lack of penetration at crack nucleation site More
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Published: 01 June 2019
Fig. 7 Crack emanating from the base of the area of lack of penetration. The inset figure, a magnified view of the encircled region, shows the intergranular nature of cracking. More
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Published: 01 June 2019
Fig. 1 Surface of the heating coil. Cracks shown up by the colour penetration process. 0.5 × More
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Published: 01 June 2019
Fig. 4 Morphology of metal loss. Note penetration of tubes. More
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Published: 01 June 2019
Fig. 5 Fatigue fracture with penetration of bearing bronze. Unetched section. 500 × More
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Published: 01 June 2019
Fig. 2 Full-penetration autogenous gas tungsten arc weld (GTAW) joint More
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Published: 01 June 2019
Fig. 3 Intergranular penetration by molten solder. (× 250). More