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electron beam welds

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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
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...
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
... 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
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
... 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
.... 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 joints. While...
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
... of the inner fracture surface in Fig. 13(a) . Arrow H shows ductile dimples and round glassy phases near the root weld. 800├Ś. Fig. 16 EDX microprobe spectrum of arrow F in Fig. 13(b) , showing the base metal. A 20 kV beam was used. Fig. 17 EDX microprobe spectrum of arrow G in Fig. 13...
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
...) of the LANSCE double-walled 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...
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 x-rays emitted from a sample is accomplished using crystal spectrometers, which use energy-dispersive techniques that permit analysis by discriminating among X-ray energies. The feature of electron-beam microanalysis that best describes this technique is its mass sensitivity. For example...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006808
EISBN: 978-1-62708-329-4
... rectangle if its long axis is perpendicular to the radiation beam, and it appears as two concentric circles (one darker than the other) if the long axis is parallel to the beam. Linear porosity is recorded on radiographs as a series of round dark spots along a line parallel to the direction of welding...
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
...-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 in this examination, EDS cannot detect...
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 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 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
...-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, containing heavy rusting and evidence of primer paint in samples B2D and B1V, were observed Macroscopically. The heavy rusting...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0049796
EISBN: 978-1-62708-235-8
... with an energy-dispersive x-ray detector. Examination of the 0.047-mm (0.0018 in.) diam nickel-chromium-iron alloy bridgewire and the nickel-iron alloy pins showed evidence of severe corrosion ( Fig. 2 and 3 ). The electron beam was positioned on the corrosion products of the bridgewire and pins, and x-ray...