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weld metal porosity

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c0047545
EISBN: 978-1-62708-236-5
... internal reflectors, indicating the presence of slag inclusions and porosity. A low-carbon steel flux-cored filler metal was used in repair welding the crankshaft, without any preweld or postweld heating. This resulted in the formation of martensite in the HAZ. The repair weld failed by brittle fracture...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0048095
EISBN: 978-1-62708-224-2
... in Fig. 1(b) . Macrographic examination of the weld disclosed inadequate joint penetration and porosity ( Fig. 1c ). Chemical analysis showed that the metal was within specifications for aluminum alloy 5083 or 5086. Analysis of the weld metal indicated that aluminum alloy 4043 filler metal had been...
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
... and drilled for bolting on a heavy steel plate. The tank was filled to a record height. In mid-Jan the temperature dropped to -31 deg C (-23 deg F), with high winds. The tank split open and collapsed. The welding used the shielded metal arc process with E6010 electrodes, which could lead to weld porosity...
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
... at the weld toe Cracks—hot or cold, longitudinal or transverse, crater and at weld toe Gas porosity Arc strike Spatter Backing piece left on: failure to remove material placed at the root of a weld joint to support molten weld metal Subsurface features that are causes for rejection...
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
...Abstract Abstract An unacceptable degree of porosity was identified in several closure welds on stainless steel containers for plutonium-bearing materials. The pores developed in the weld tie-in region due to gas trapped by the weld pool during the closure process. This paper describes...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001612
EISBN: 978-1-62708-218-1
... The weld nugget connecting the two sheets peeled and separated with minimal plastic deformation. The absence of large-scale deformation at the weld nugget indicated that the surfaces were not properly joined. This observation was supported by the presence of shrinkage porosity, insufficient melting...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001089
EISBN: 978-1-62708-214-3
... The microstructure in the casting was generally found to be tempered martensite, with significant variation in microstructure from weld metal to the core. The mounted sample contained a considerable amount of shrinkage porosity. Figure 9 shows a macrograph of the crosshead about 10 mm (0.4 in.) under the fracture...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c0089696
EISBN: 978-1-62708-220-4
... with the initiation of cracks at slag inclusions and sharp fillets in weld-repair areas in the casting. The weld-repair procedures were unsatisfactory. The cracks propagated in a fatigue mode. he casting quality was judged unacceptable because of the presence of excessive shrinkage porosity. It was recommended...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0046233
EISBN: 978-1-62708-235-8
... amount of porosity. Electron fractography established that the cast connection on the left side failed by brittle fracture. Metallographic examination showed poor weld quality in the casting-to-tube joint. Evidence found supports the conclusions that the drawbar fractured in fatigue, which originated...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001684
EISBN: 978-1-62708-225-9
... Zn-depleted corrosion regions. Fig. 9 Zn-depleted region in the nut. Fig. 10 Zn-depleted region in the nut. Fig. 11 shows a Zn-depleted region of the welded tip. There is extensive porosity in this region. At the interface separating the unattacked region it is seen...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001641
EISBN: 978-1-62708-235-8
... volume is shrinkage porosity. Shrinkage porosity generally has characteristic dendritic features that are clearly visible, as shown in Fig. 2 and 3 . The shrinkage porosity shown in Fig. 2 and 3 is not from a die casting but from a resistance weld in a steel assembly. Shrinkage porosity in die...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c0047512
EISBN: 978-1-62708-219-8
... stresses, welding at a slower rate (with perhaps less metal laid down per pass) combined with careful peening to reduce internal stress, perhaps the choice of a more favorable electrode to avoid porosity, careful termination of all welds interrupted by a shift change to avoid formation of notches...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001710
EISBN: 978-1-62708-229-7
.... Fig. 5 Broken spot welds on T-bar channel Fig. 6 Porosity in the welds Fig. 7 No degradation of the base metal Analysis of the surfaces of the racks indicated that pitting and exfoliation corrosion were the predominant corrosion mechanisms involved. Exfoliation is a form...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001429
EISBN: 978-1-62708-227-3
... of a semi-circular zone in the region of the porosity that was practically devoid of sulphur content, a feature commonly associated with a fusion weld. On etching this zone a weld was clearly revealed, its contour being as shown in Figure 3 . The web was sectioned transversely in the plane of the crankpin...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006760
EISBN: 978-1-62708-295-2
... Aluminum casting exhibiting gas porosity Shrinkage porosities or cavities are voids caused by the shrinkage of molten metal when cooling. They are indicative of a design or manufacturing problem. The porosities or cavities often have a lobed appearance with sharp corners, which can act as stress...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001430
EISBN: 978-1-62708-236-5
... to heat-affected zone cracking, residual stresses, the lower fatigue strength of the weld deposited metal, and weld defects. Repair welding Shafts (power) Weld defects Fe-0.6C Joining-related failures Fatigue fracture It is true to say that the construction of engineering plant — vessels...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001630
EISBN: 978-1-62708-236-5
... with porosity in the metal, while a longer crack, approximately 7 mm (0.28 in.) in length, was present running out of the weld on the inboard side ( Fig. 9 ). Fig. 9 Close-up view of failed bearing cap showing region where strap had become detached. The remains of some of the welds that had joined...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001777
EISBN: 978-1-62708-241-9
... stresses. During the analysis of the welded joints, defects like porosities, lack of penetration, and lack of fusion were observed, not only at the failed welded joint but also in the weld of the connection between the flange and RHS that did not fail. Figure 7 presents the transverse view of the weld...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c9001438
EISBN: 978-1-62708-224-2
... acid to reveal indications of a weld deposit as depicted in Figure 3 . As will be seen from Figure 4 , the root of the welded zone was defective, showing porosity and globules of weld metal. Fig. 3 Etched surface of hook showing weld deposit adjacent to fracture origin. Fig. 4...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001661
EISBN: 978-1-62708-229-7
... into the column flange, along the column side fusion line into the weld, or directly into the weld metal. Other discontinuities such as porosity were noted in several of the welds. The surface to be examined was prepared using the following materials: 180 grit silicon carbide 240 grit silicon carbide...