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Processing line inclusion (PLI) and joint line hooking (JLH) in Cu-OFP friction stir weld – part 1: metallographic examinations
RISE, Swerea, Swerea KIMAB.
2011 (English)Report (Refereed)
Abstract [en]

Six samples were extracted at positions 16°, 42°, 67°, 98.5°, 123°, and 338° from a circle friction stir weld (FSW) of Cu-OFP, designated internally FSWL08/KL059, in order to examine if there is processing line inclusions (PLI) in the FSW. The samples were metallographically prepared, were annealed in hydrogen, and were electrolytically polished and etched, respectively. The samples were examined macro- and microscopically. Chemical compositions of the particles/inclusions inside PLI were quantitatively determined. The PLI did find on the retreating side of FSW on all six investigated samples. Usually, the PLI consists of two parts, an axial PLI and a radial PLI. The axial PLI, commonly 1~2 mm long, occurred about 7~9 mm right above the joint line hooking (JLH) in the FSW. It is often separated and crack-like. It is thought to be a remaining part of slit/JLH. The radial PLI continued from the axial PLI and followed to a large extent the contour of processing line on the retreating side. It could be as long as the processing line. The axial PLI at the position 42° went through entire thickness of the investigated sample, indicating that it is very likely that the axial PLI may have penetrated all the way along the FSW. Particles/inclusions were detected inside the PLI. The particles/inclusions consist of mainly silicon-oxide, as well as aluminium-, potassium-, calcium-, and sodium-oxides. In the present case, both hydrogen annealing and electrolytic polishing and etching revealed the PLI effectively and apparently. The JLH bent downwards and towards the outer surface. It was about 3.5~5 mm away from the root of the FSW. It is recommended to carry out tensile and creep tests to determine and to evaluate the PLI’s impact on the integrity of copper canisters. Keywords: Processing line inclusions (PLI), joint line hooking (JLH), Cu-OFP, friction stir (FSW), metallography, hydrogen annealing, electrolytic polishing and etching, oxide, integrity.

Place, publisher, year, edition, pages
Swerea KIMAB AB , 2011.
Series
Rapport / Institutet för metallforskning, ISSN 1403-848X ; KIMAB-2011-111
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-13051OAI: oai:DiVA.org:ri-13051DiVA: diva2:973245
Available from: 2016-09-22 Created: 2016-09-22Bibliographically approved

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CiteExportLink to record
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  • apa
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  • modern-language-association-8th-edition
  • vancouver
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More styles
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  • de-DE
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  • en-US
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  • nn-NO
  • nn-NB
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