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Electron beam welding

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0047710
EISBN: 978-1-62708-225-9
... Abstract A 9310 steel gear was found to be defective after a period of engine service. A linear crack approximately was discovered by routine magnetic-particle inspection of an electron beam welded joint that attached a hollow stub shaft to the web of the gear. The welding procedure had...
Image
Published: 01 June 2019
Fig. 1 Fracture surface of an electron beam weld in the web of an AISI 9310 steel gear. The weld fractured because of incomplete fusion. The incomplete-fusion zone where fracture originated is shown at region A; region B shows fatigue beach marks, and region C exhibits bending-fatigue patterns More
Image
Published: 01 January 2002
Fig. 58 Gas porosity in electron beam welds of low-carbon steel and titanium alloy. (a) Gas porosity in a weld in rimmed AISI 1010 steel. Etched with 5% nital. 30×. (b) Massive voids in weld centerline of 50 mm (2 in.) thick titanium alloy Ti-6Al-4V. 1.2× More
Image
Published: 30 August 2021
Fig. 55 Fracture surface of an electron beam weld in the web of an AISI 9310 steel gear. The weld fractured because of incomplete fusion. The incomplete fusion zone where fracture originated is shown at region A; region B shows fatigue beach marks, and region C exhibits bending fatigue More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001505
EISBN: 978-1-62708-217-4
... was made up of two parts: the output shaft with an integral 10 in. diam upper disc at approximately mid-section; and a 10 in. diam lower disc. During manufacture, the lower disc was attached to the output shaft by an electron beam weld. The fracture had a single fatigue initiation site, coincident...
Image
Published: 01 January 2002
Fig. 59 A spiking defect in a centerline section at the root of an electron beam weld. The partial-penetration weld was made in 75 mm (3 in.) thick Ti-6Al-4V titanium alloy plate. 1.6× More
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
... welding processes. The article also describes failure origins in other welding processes, such as electroslag welds, electrogas welds, flash welds, upset butt welds, flash welds, electron and laser beam weld, and high-frequency induction welds. arc welding brittle fracture electrogas welds...
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
.... The weldments were finally secured to the bases of the turbine blades by a brazing operation. One of the laser beam attachment welds broke after a 28-h engine test run. Exposure of the fracture surface for study under the electron microscope revealed the joint had broken in stress rupture. Failure was caused...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001679
EISBN: 978-1-62708-229-7
... as the noted observations, are described. Six stages [two machined (MP) and four electron beam (EB) welded] from the mercury diffusion pumps operating in the Tritium Purification process at SRS have been analyzed to determine their condition after nine months of usage. Several cracks were found around...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001524
EISBN: 978-1-62708-221-1
... from this microcrack. Scanning electron microscopy showed an overload crack extended across the remaining cross section of the chord. It was concluded that the presence of the bolt hole used to attach the gusset plate to the chord created a stress riser adjacent to the hole. Repeated high tensile...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001611
EISBN: 978-1-62708-219-8
... in subsequent sections of this article. Fig. 4 Metallographic image of weld HAZ microstructure. 200× Scanning Electron Microscopy A section of the cracked weld was carefully opened to facilitate examination and identification of the fracture mechanism. Scanning electron microscopy (SEM...
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
... of a polished-and-etched core, and the crack at the weld toe can be seen to extend more than halfway through the beam flange. The crack surface of the core was exposed and examined with the electron microscope. Because the surface was relatively clean and not extensively corroded, the crack-surface features...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006838
EISBN: 978-1-62708-329-4
... wavelengths, the emissivity value cancels, and the true temperature is related to that ratio regardless of the emissivity. Directed-Energy Deposition Directed-energy deposition feeds material into an energy beam, typically a laser, electron beam, or plasma arc weld head. Feedstock is typically...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001544
EISBN: 978-1-62708-219-8
... radius; but after the part cracked in the shop, the radius shown here was milled on all four junction pieces used on the bridge. The repair weld material was not determined, but it is apparently a tougher material than the base metal. Metallography and electron microfractography completed...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001632
EISBN: 978-1-62708-234-1
... reactor environment at 288 °C. 10 Additional analysis by scanning electron microscopy (SEM) is needed to quantify this speculation. Fig. 19 Optical micrograph showing an apparent darkening at the grain boundaries in the highest-dose region of the shell 1 Tensile Properties Dose...
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
... sample after cleaning, showing the extent of cracking on the outside surface. Arrow A shows the location of the radial crack, and arrows B and C show the left and right ends of the crack, respectively. Scanning Electron Microscopy/Fractography After initial cleaning and prior to opening...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001329
EISBN: 978-1-62708-215-0
... of electron-beam microanalysis that best describes this technique is its mass sensitivity. For example, it is often possible to detect an 10 −16 g of an element present in a specific microvolume of a sample. The minimum detectable quantity of a given element, or its detectability limit, varies with many...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001365
EISBN: 978-1-62708-215-0
... examination based on the characteristic energies of x-rays produced by the electron beam. EDS can normally detect elements with atomic numbers of 13 (aluminum) and above at concentrations as low as 0.3 to 0.5 wt%; fluorine, sodium, and magnesium are detectable at somewhat higher concentrations. As performed...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0006548
EISBN: 978-1-62708-180-1
... Aircraft Structural Integrity Program ASME American Society of Mechanical En- gineers ASTM American Society for the Testing of Materials AWS American Welding Society bcc body-centered cubic B Burgers vector BS British Standard BSE backscattered electrons BSI British Standards Institution CAD computer-aided...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.9781627081801
EISBN: 978-1-62708-180-1