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initial-gap welding

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Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001039
EISBN: 978-1-62708-214-3
... been a secondary failure, because there could be no stress on the welds once the spindle failed. The failure of the weld on the outside of the collar initiated at the root of the weld, where the weld had to bridge a wide gap. The fracture surfaces on this weld showed many areas that were parallel...
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
... by the heat associated with the welding process. In addition, several of the test conditions were selected to evaluate the effects of axial gaps in the fit-up of the weld joint and the interference fit between the container and lid. Matrix of Initial Test Welds Table 2 Matrix of Initial Test Welds...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001821
EISBN: 978-1-62708-180-1
... surface Fig. 22 Distortion in the web gap. M, bending moment; L, gap between surface of flange and weld to web Fig. 23 Measured street gradient in the web gap. Fig. 24 Diaphragms and girders in a continuous-span structure. Fig. 25 Crack along the web-flange weld...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001594
EISBN: 978-1-62708-229-7
... of safety against fatigue crack initiation. (If the weld is made with excessive heat, weld shrinkage reduces the pipe inside diameter.) Ensure proper radial clearance and axial gap. Although it may be possible to effectively “stiffen” the joint by eliminating the axial gap, this option is not allowed...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c9001392
EISBN: 978-1-62708-231-0
... in an oxidizing or corrosive environment. The cracking in this particular case was due principally to the inordinately large gap between the components. Additionally, several of the sealing welds of the tubes to the back tube plate were cracked in a radial manner, and it would appear that in addition, abnormal...
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
... of a human life would be at stake, a steel with a much lower ductile-to-brittle transition temperature is essential. The other necessary steps include better control of the girth-welding conditions, such as more accurate fit-up to provide a uniform gap, preweld and postweld heating to minimize thermal...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c9001149
EISBN: 978-1-62708-232-7
... at the welded edges of the ring than at the center of the ring due to the permanent antielastic curvature introduced when the rings were fabricated. The maximum gap varied from ring to ring. A series of thermal problems were run with the gap thickness varied from zero to 2.54 cm (1 in.). The reference problem...
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
... and/or penetration, and gas evolution (which could be due to presence of moisture, oil, etc.) at the weld interface ( Fig. 7 ). The interface between the middle sheet and the bottom sheet revealed large gap and shrinkage porosity ( Fig. 8 ), which aided the crack initiation and consequent failure of the spider...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001570
EISBN: 978-1-62708-220-4
... by exchanger tube on the seal weld. The seal welds are mainly for sealing up the gap between tubesheet and tubes. To ensure the holding strength of an expanded joint, a residual contact pressure of sufficient intensity between the tube and the tubesheet must be maintained. In practice, an expansion ratio...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001028
EISBN: 978-1-62708-214-3
... deflection of the endcap outer skin on both sides of the bracket is evident. Dimensions given in inches. Dimensional measurements obtained during disassembly also revealed two factors. First, the gap between the vent-tube casting end and the inside of the tank top surface was less than the applicable...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001721
EISBN: 978-1-62708-225-9
... Visual and Optical Microscopy Chemical and Mechanical Conformance Results from optical and scanning electron microscopy indicated that the fracture or cracking of the bonnet screws started from the outside edge and propagated towards the center for both of the failures which occurred at the gap...
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
... of a buttstrap there would exist, or be brought about by contraction of the weld-metal, a slight gap between the hole in the butt-strap and the rivet shank, designated X in Fig. 6 . When the vessel was subsequently pressurised the shell plate would no longer be free to move relative to the butt-straps so...
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
..., penetrated the original tube-to-duct weld (weld 1), but in the area of the fracture, there was a gap between the two sheets of stainless steel, and the third weld was separate (weld 3). Examination of the underside of the joint showed incomplete fusion of the weld between the tube and duct...
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
... Member Intersection Methods The joining methods for the frame tubes compound both the fatigue and impact loading problems. Where tubes intersected, one was cut straight and placed on top of the other. The resulting gaps were filled with welding rod, a practice that should be avoided. The proper...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001765
EISBN: 978-1-62708-241-9
... of the annular and bottom plate and mainly concentrated over and/or near the weld junction of two sections of bottom plates. A gap between backfill and the bottom plates was also visualized around the same area along the periphery of the tank. Fig. 1 (a) Topside of the bottom plate sample, cut from...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006765
EISBN: 978-1-62708-295-2
... micrographs of the surface of a carburized 8620 alloy steel specimen mounted in phenolic resin. Note the shrinkage gap (see arrows in a) that has reduced the edge flatness. In (b), taken at 1000×, decarburization at the surface has caused ferrite and pearlite to form, and this area is slightly out of focus...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001580
EISBN: 978-1-62708-229-7
... . The volume of the globule is approximately 51.9 mm 3 . These volumes are referenced to the can OD surface. Since the weld bead is typically concave due to the can/plug gap, the hole is actually smaller and the globule larger than these volumes indicate. During the mapping process, it is not possible...
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
...: Fill crater sufficiently before breaking the arc. Employ a backstepping technique (terminate each weld on the crater of the previous weld). To prevent cracking under restraint conditions: Eliminate or decrease the degree of restraint. Leave a gap between plates to permit shrinkage...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003532
EISBN: 978-1-62708-180-1
... alloy steel specimen mounted in phenolic resin. Note the shrinkage gap (see arrows in a) that has reduced the edge flatness. In (b), taken at 1000×, decarburization at the surface has caused ferrite and pearlite to form, and this area is slightly out of focus. Specimen etched with nital Fig. 13...
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
... of Fossil Plants, EPRI , Palo Alto, CA ( 1986 ). 3. Pope D. P. , Private Communication, University of Pennsylvania , Philadelphia, PA ( 1986 ). 4. Hantsch H. et al. , “ Submerged Arc Narrow-Gap Welding of Thick-Walled Components ,” Welding Journal , Vol. 61 , pp. 27 – 34...