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Troy Brayden Lewis Masters Thesis.pdf (2.4 MB)

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Process Development and Capabilities of Chemically Augmented Laser Impact Welding

Lewis, Troy Brayden
http://orcid.org/0000-0002-0600-9239
http://rave.ohiolink.edu/etdc/view?acc_num=osu1650539120515768

Abstract Details

2022, Master of Science, Ohio State University, Materials Science and Engineering.
The process of laser impact welding utilizes impact welding and laser-driven flyers to form solid-state, metallurgical welds between similar or dissimilar metallic flyers and targets. With chemically augmented laser impact welding, stronger and thicker metal flyers and targets can be welded together. Using a high-powered laser, a laser pulse is shot through a transparent tamping layer onto a translucent layer of chemical liquid and the bare surface of a metallic flyer. The energy from the laser pulse detonates the chemical augment and the pressure created from the explosion is confined by the tamping layer. This pressure is directed towards the flyer that is then driven to velocities in the hundreds of meters per second within 20 microseconds. Under the correct conditions, high speed and acceptable impact angle between the flyer and target, jetting will occur. The jet cleans the surface of the flyer and target of oxides, and the two surfaces will form a solid-state, metallurgical bond. Using a chemical augment, thicker, stronger flyers and targets can be welded compared to unaugmented laser impact welding. With the chemical augment, a 3J, 8.1ns laser pulse can weld a 0.5mm Al2024-T3 flyer to a 0.5mm Al2024-T3 target. To explore the capabilities of chemically augmented laser impact welding, two chemical augments were used as candidates for the process. Various tamping materials and thicknesses were also investigated along with variance in the laser spot diameter. The velocities of flyers were measured using Photon Doppler Velocimetry and a thicker tamping layer produced higher velocities and larger deformations than thinner tamping layers did with the same parameters. The strength of the welds between 0.5mm Al2024-T3 flyers and targets were also measured using a tensile test. Over two-thirds of the welded samples failed by nugget pullout during these tensile tests, validating the strength of the welds formed. Micrographs of a welded sample were also collected to observe the welded and unwelded regions. Finally, future work to advance chemically augmented laser impact welding is discussed.
Glenn Daehn (Advisor)
Boyd Panton (Committee Member)
75 p.
Engineering; Materials Science; Metallurgy
Impact Welding; Laser Impact Welding; Chemically Augmented Laser Impact Welding; Photon Doppler Velocimetry; LIW; CALIW; PDV; Solid State Joining; Chemical Augment

Recommended Citations

Citations

  • Lewis, T. B. (2022). Process Development and Capabilities of Chemically Augmented Laser Impact Welding [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1650539120515768

    APA Style (7th edition)

  • Lewis, Troy. Process Development and Capabilities of Chemically Augmented Laser Impact Welding. 2022. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1650539120515768.

    MLA Style (8th edition)

  • Lewis, Troy. "Process Development and Capabilities of Chemically Augmented Laser Impact Welding." Master's thesis, Ohio State University, 2022. http://rave.ohiolink.edu/etdc/view?acc_num=osu1650539120515768

    Chicago Manual of Style (17th edition)

osu1650539120515768
79
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