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initial-contact welding

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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 Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001808
EISBN: 978-1-62708-180-1
.... Discussion Vibration in the fuel pump could be expected to initiate damage, particularly when combined with an abrasive action. Under these conditions, fretting or abrasive wear can be expected on sliding-contact surfaces that are not sufficiently abrasion resistant. The residue from the filter...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0047072
EISBN: 978-1-62708-217-4
...) was present at the portion of the weld in the shell. These conditions were the result of spot welding the shell in the annealed condition. During welding, the weld zones distorted under the welding pressure and increased the contact area, which changed the current distribution and resulted in low...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001811
EISBN: 978-1-62708-180-1
... expressed in terms of its diameter measured at the base of the groove. This is its tread diameter. It can also be expressed as a ratio determined by dividing the tread diameter by the nominal rope diameter. As sheave size is decreased, the stresses resulting from bending and the contact pressure between...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006791
EISBN: 978-1-62708-295-2
....2015.08.026 146. Karlsson P. , Krakhmalev P. , Gåård A. , and Bergström J. , Influence of Work Material Proof Stress and Tool Steel Microstructure on Galling Initiation and Critical Contact Pressure , Tribol. Int. , Vol 60 , 2013 , p 104 – 110 10.1016/j.triboint.2012.10.023...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001308
EISBN: 978-1-62708-215-0
... depth could be achieved on the bottom surface. Heat treatment of the rail was performed after installation. Oxyacetylene torches and a water-quench system mounted on a carriage were used to harden the contact surfaces. The torches were passed over the rail a second time to temper the hardened layer...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003553
EISBN: 978-1-62708-180-1
... laps, seams, or slivers Following is an example of SCC from a stress concentration in which alloy selection and design changes were required. Example 3: Effect of Alloy Selection and Part Design on SCC of Formed Silicon Bronze in Marine-Air Atmosphere Electrical contact-finger retainers...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0091727
EISBN: 978-1-62708-217-4
... further resulted in the imposition of a control specification (MF0004-018) for all fluids that contact titanium for existing and future space designs. Pressure Vessels Propellant tanks Surface pretreatments Ti-6Al-4V UNS R56406 Stress-corrosion cracking The storable hypergolic fuel used...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001523
EISBN: 978-1-62708-227-3
...-welded into the ship deck. Water and debris eventually fill the cup and contact the deck socket. Various cracked deck sockets were provided to the division for analysis. Other specimens were provided as circular plate sections containing the crack and the crack-initiation surface. Specimens were...
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003548
EISBN: 978-1-62708-180-1
.... Galvanic corrosion occurs when two dissimilar conducting materials (metallic or nonmetallic) are in electrical contact. It usually consists of two dissimilar conductors in electrical contact with each other and with a common conducting fluid (an electrolyte), or it may occur when two similar conductors...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001460
EISBN: 978-1-62708-221-1
.... These developed to a greater extent in weld C in Figure 1 and the subsequent contact between the opposing faces gave rise to the smooth type of fracture that was evident, it being considered that this was the first weld to fail. Following separation of this weld, failure of the other one took place in a fairly...
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
... included manufacturing the doubler collar so that it could be placed in intimate contact with the header duct, and a revised weld procedure was recommended to result in a smaller, controlled, homogeneous weld joint with less distortion. Heat exchanger tubes Inlet headers Stress concentration...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006783
EISBN: 978-1-62708-295-2
... of corrosion. Uniform attack, pitting, and crevice corrosion can all be exacerbated by galvanic conditions. Galvanic corrosion occurs when two dissimilar conducting materials (metallic or nonmetallic) are in electrical contact with an electrolyte or conducting medium. It usually consists of two dissimilar...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001442
EISBN: 978-1-62708-221-1
... defects Mild steel Joining-related failures The impeller of this extraction fan, 4-ft diameter, driven by a 120 h.p. motor at 1,480 r.p.m. disrupted suddenly, and subsequent contact between portions of the impeller and the casing resulted in a shower of sparks which caused a serious fire. Portions...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001810
EISBN: 978-1-62708-180-1
.... 6a ). An enlarged view of one spot ( Fig. 6b ) shows more clearly an area from which metal was removed and evidence of a heat-affected zone (HAZ) around the area. Fig. 6 Weld spots on contact surfaces of a type 440C stainless steel ball bearing. The spots are caused by static electrical...
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
... to cracking, a magnetic-particle test was done to check for cracks. No cracks were found, but a few weeks later, the weldments were returned, because cracks had initiated at minute arc strikes that were caused by the prods used to make electrical contact for the magnetic-particle test. Due to their small size...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001813
EISBN: 978-1-62708-180-1
... involved would lessen or eliminate the compressive stress produced by shot peening, and contraction of the surface in contact with the tightly adherent weld metal during cooling could generate other stresses. Adherence of the spatter drop could be affected by the opening and closing of the fatigue crack...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0047541
EISBN: 978-1-62708-217-4
.... The brass nut, which had been in contact with the three threads adjacent to the fracture, showed no sign of corrosion or oxidation on its mating threads. The thread roots in the rod contained many intergranular microcracks ( Fig. 1a ). A grain-boundary network of ferrite is also visible in Fig. 1...
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
... riser at the weld root. This annular gap also forms a crevice (or slot) where stagnant, potentially corrosive fluid comes in contact with the weld root. Butt-welded joints are more resistant to fatigue-induced damage than socket-welded joints because the annular gap is eliminated. Experience shows...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0089734
EISBN: 978-1-62708-235-8
... instances, penetration was deep enough so that the fillet weld merged with the root pass of the exterior weld. In others, as in Fig. 1 , this did not occur; as a result, a short span existed where there was incomplete penetration, and the original edges of the flange and elbow were still visibly in contact...