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masking

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Image
Published: 30 August 2021
Fig. 15 Solder mask defined and nonsolder mask defined pad opening configurations. PCB, printed circuit board More
Image
Published: 30 August 2021
Fig. 24 Simplified daisy chain circuit. PCB, printed circuit board; NSMD, nonsolder mask defined; ENIG, electroless nickel and immersion gold More
Image
Published: 01 December 1993
Fig. 5 SEM fractographs of the inside radius of the bend. (a) A distinct intergranular fracture surface for the entire tube thickness at the inside radius of the bend. (b) The oxide-type corrosion product masking the intergranular facets of the fracture. More
Image
Published: 01 December 1992
Fig. 4 SEM micrographs of sample SEM 2. (a) Overview of the surface defects in group 2. The vertical lines are grinding marks. (b) Higher-magnification view of the dendritic structure af the pore indicated by the arrow in (a).The dendrites are slightly masked by a corrosion product. More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0006421
EISBN: 978-1-62708-217-4
... initiation in the middle fastener holes was masked by excessive corrosion. It was recommended that future panels be manufactured of 2024 aluminum. ...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c9001413
EISBN: 978-1-62708-223-5
... in B whereas that of the other is masked, being in the root of C. The arrows marked on the photograph illustrate the mode of propagation. Final fracture occurred in the small area indicated by A. A Longitudinal section through the screw thread on the piston rod is seen in Fig. 3...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0045926
EISBN: 978-1-62708-235-8
... of the clad bimetal onto an epoxy film, so that the end product contained nickel-phosphorus sandwiched between copper and epoxy, with a chromate conversion layer on the epoxy side of the nickel-phosphorus. Peel test samples were prepared by masking and etching the copper ( Fig. 1 ). Testing revealed...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001906
EISBN: 978-1-62708-217-4
... inspection (a central conductor shot and a head-shot) to assure that any laps or seams were detected. The handling of the lugs subsequent to inspection was also improved in an effort to reduce the masking of defective parts. Thousands of lugs were scrapped as a result of this re-inspection, and the contracts...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001556
EISBN: 978-1-62708-218-1
... the plated side, the inner surface of the eye ends being masked). It was ascertained during investigation that 40 mm. diameter forged piston rods were subjected to plating after carrying out heavy machining on the part without any stress-relieving treatment. Also, time lapses between plating and baking were...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006827
EISBN: 978-1-62708-329-4
... different soldering pad opening configurations: solder mask defined (SMD) and nonsolder mask defined (NSMD). The SMD pad opening has a higher risk of IMC fracture under high-loading-rate conditions, while the NSMD pad opening has a higher risk of pad cratering ( Ref 32 ). Fig. 15 Solder mask defined...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001613
EISBN: 978-1-62708-235-8
...°) during room temperature testing resulted in cracking of the screws. Conclusions The tappet adjusting screws failed by hydrogen embrittlement. This conclusion was confirmed when a baking treatment at around 150–200 °C after plating, in conjunction with masking the threaded portion of the screw...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001472
EISBN: 978-1-62708-221-1
... beam and possibly serve to mask those from any crack that may have been present. In order to ascertain the minimum depth of cracking that it would be possible to detect in the presence of the influence of the hole a series of tests was carried out on the other, intact end of the shaft. The response...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006758
EISBN: 978-1-62708-295-2
... analysis on an assembled component. Interference from other parts of the system such as insulation, paint, wiring, and enclosures all add uncertainty to the RT inspection and may reduce sensitivity. In service, components can develop dents, dings, corrosion and other features that can mask, disturb...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0060144
EISBN: 978-1-62708-234-1
... by masking the smaller fissures. Liquid penetrant inspection and macroexamination of the specimen tube revealed the gross fissuring that was easily detectable and those fissures that were undetectable by radiography. The largest fissures undetectable by radiography were approximately 3 mm (0.125...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001370
EISBN: 978-1-62708-215-0
... on the fracture surface. The fracture surface was helical in shape, smooth, and flat. Some portion of the fracture surface was found to have been rubbed. A cavity near the center was observed ( Fig. 3 ). The presence of corrosion deposits masked the macroscopic fracture details. After cleaning with 50...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001075
EISBN: 978-1-62708-214-3
... of the beach marks pointed to the origin of the fatigue fracture. The fatigue fracture surface is shown at high magnification in Fig. 4 . No fatigue striations were observed, but they may have been masked by corrosion products formed on the fracture surface. Figure 5 shows the final overload fracture...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001084
EISBN: 978-1-62708-214-3
... of the dendritic structure af the pore indicated by the arrow in (a).The dendrites are slightly masked by a corrosion product. Metallography Microstructural Analysis Four metallographic samples, MET 1 to 4, were sectioned from various areas near the fracture surface and through the casting defects...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001341
EISBN: 978-1-62708-215-0
... mode with corrosion product. Fig. 5 SEM fractographs of the inside radius of the bend. (a) A distinct intergranular fracture surface for the entire tube thickness at the inside radius of the bend. (b) The oxide-type corrosion product masking the intergranular facets of the fracture...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001706
EISBN: 978-1-62708-217-4
... and paint masked the pit. Furthermore, it appears that the pit had been missed during the various stages of inspection either during manufacture or overhaul. At any rate, this pit would have been extremely hard to detect even by a diligent inspector. Fig. 20 An overview of the corrosion pit that had...
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
... preparation by metal removal may be necessary in areas where surface irregularities may mask discontinuous indications. Prior to the examination, areas plus the surface within at least one inch of the examination areas shall be dry and free of dirt, grease, lint, scale, welding flux, spatter, oil, or other...