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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 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...
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
... assembly 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...
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 well 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...
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
... longitudinal beams or chords of the trussed boom had fractured adjacent to a bolt hole at a location about halfway along the length of the boom. Over the lifetime of the crane, several repairs had been made to the boom. At least a year before the failure, a reinforcing gusset plate had been bolted and welded...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001079
EISBN: 978-1-62708-214-3
..., including tensile, Charpy V-notch impact, and fracture toughness. Because of the limited sample size, standard specimens were fabricated by electron beam welding similar material attachments. This method also allowed determination of the properties in the proper orientation of interest—namely, the axial...
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
... of the I-beam comprising the lower chord of the truss section scheduled to be the next truss erected. The crack ran almost the entire length of the lower flange, approximately 24 in. The failed weld joined the 3.25 in. thick flange of one I-beam to a 2.40 in. thick flange on another I-beam of 2.40...
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
... the crack surfaces and the retrofit conditions conducted in 1976. Figure 5 shows the center 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...
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
... photograph of the failed spot weld 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...
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
... web welds. The arch rib top plate, as it met the main girder, formed a composite beam of A588/A36 composition. Investigation showed the original design of the failed component called for an angle of high geometric stress concentration (90 deg with no radius) in a region of substantial transverse weld...
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
...-ray energies. The feature 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...
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
... hemispherical beam exit window showing placement of the thermocouples. Note that several spot welds were used to affix the thermocouple pads to the window surface. The thermocouples were attached by spot welds ( Fig. 2 ) after the alloy 718 material had been precipitation hardened (PH). As discussed...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006764
EISBN: 978-1-62708-295-2
... targets have an electron beam path that is roughly concentric to the x-ray beam, which is achieved by adhering a thin piece of target material to the tube window. This style of tube is capable of the highest levels of magnification, because the object being imaged can be placed nearly touching the focal...
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.v11.9781627081801
EISBN: 978-1-62708-180-1
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001113
EISBN: 978-1-62708-214-3
... fillet-weld HAZ, or weld toe, of each diagonal and vertical angle brace. There was also one horizontal crack in the HAZ of the plate-to-beam fillet weld (sample A1H The plates had been properly removed, so the affected weld areas were not damaged metallurgically. A large portion of the exposed cracks...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001082
EISBN: 978-1-62708-214-3
... surface contained pits and heat tinting. Fig. 11 Photomacrograph of fracture faces from crack shown in Fig. 4 . 1.37×. Scanning Electron Microscopy/Fractography Figure 12 shows a scanning electron microscope (SEM) cross section of one of the surface pit areas shown in Fig. 11...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001682
EISBN: 978-1-62708-229-7
... (89,000 psi). When the seam weld was parallel to the specimen axis, the measured strength was increased because the specimen configuration forced deformation and fracture to occur in the weld metal. The ultimate strength of these samples was 752 MPa (109,000 psi). Optical and scanning electron microscopy...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006785
EISBN: 978-1-62708-295-2
...: Visual examination Nondestructive examination Microscopic examination of fracture/crack surface using a stereomicroscope and/or scanning electron microscope Collection and analysis of corrosion product or other deposits Metallographic examination Hardness testing and/or other mechanical...