Flexible Friction Stir Joining Technology

Zhao, Feng; Lim, Yong Chae; Mahoney, Murray W.; Sanderson, Samuel; Larsen, Steve; Steel, R.; Fleck, Dale; Fairchild, D.P.; Wasson, Andrew; Babb, Jon; Higgins, P. R. B.

doi:10.2172/1210157

Cited by 3 publications

(4 citation statements)

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“…FSW is a process that requires no consumables or shielding gas because it involves no melting of metal. This results in a reduction of pipeline installation costs [12]. A solid-state weld is fabricated by inserting a non-consumable welding tool into the steel at the mating surfaces and mechanically mixing the metal to form a permanent joint.…”

Section: Introductionmentioning

confidence: 99%

“…Heat input is lower than conventional consumable welding which prevents solidification cracking, reduces the size of the heat affected zone, and reduces the magnitude of residual stresses [11]. Friction stir welding capabilities are not yet deployable in the field for pipelines; however, recent [12] advances in research suggests this technique will become feasible in the near future. Although FSW presents a lower cost alternative to conventional arc welding techniques, the susceptibility of FSW to hydrogen assisted fatigue crack growth has not been evaluated.…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen accelerated fatigue crack growth of friction stir welded X52 steel pipe

Ronevich

Somerday

Feng

2017

International Journal of Hydrogen Energy

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Friction stir welded steel pipelines were tested in high pressure hydrogen gas to examine the effects of hydrogen accelerated fatigue crack growth. Fatigue crack growth rate (da/dN) vs. stress-intensity factor range (K) relationships were measured for an X52 friction stir welded pipe tested in 21 MPa hydrogen gas at a frequency of 1 Hz and R = 0.5. Tests were performed on three regions: base metal (BM), center of friction stir weld (FSW), and 15 mm off-center of the weld. For all three material regions, tests in hydrogen exhibited accelerated fatigue crack growth rates that exceeded an order of magnitude compared to companion tests in air. Among tests in hydrogen, fatigue crack growth rates were modestly higher in the FSW than the BM and 15 mm off-center tests. Select regions of the fracture surfaces associated with specified K levels were examined which revealed intergranular fracture in the BM and 15 mm off-center specimens but an absence of intergranular features in the FSW specimens. The X52 friction stir weld and base metal tested in hydrogen exhibited fatigue crack growth rate relationships that are comparable to those for conventional arc welded steel pipeline of similar strength found in the literature.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrogen accelerated fatigue crack growth of friction stir welded X52 steel pipe

Ronevich

Somerday

Feng

2017

International Journal of Hydrogen Energy

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“…Rad [24] je imao za cilj da unaprijedi tehnologiju zavarivanja trenjem sa miješanjem (FSW), visoko energetski efikasnog procesa zavarivanja u čvrstom stanju, za proizvodnju velikih i složenih konstrukcija, kao što su cjevovodi od čelika velike debljine zida sa velikim performansama i za visoke temperature, a postupak se može primijeniti i na terenu. Tehnološke inovacije koje su razvijene u ovom radu pokušale su da riješe dva fundamentalna nedostatka FSW postupka: nemogućnost zavarivanja na terenu i nemogućnost zavarivanja čelika velike debljine zida, što bi proširilo upotrebu FSW postupka u proizvodnji.…”

Section: Istraživanja I Razvoj Postupka Fswunclassified

Zavarivanje trenjem sa miješanjem - razvoj i primjena

Šibalić,

Vukčević,

Mumović

2023

JEM

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Rad se odnosi na prikaz postupka Zavarivanja trenjem sa miješanjem (Friction Stir Welding), zatim daje kratku istoriju razvoja, primjenu u industriji, usvojenu terminologiju postupka, kao i pregled izabranih istraživanja. Suština procesa je zavarivanje u čvrstom stanju, gdje je izbjegnuto topljenje materijala, što postupak FSW svrstava u ekološki čiste i energetski efikasne postupke, sa izuzetno dobrim i pouzdanim karakteristikama zavarenog spoja. Velika prednost je u spajanju teško zavarivih istorodnih i raznorodnih materijala, korišćenjem rotirajućeg alata, uz generisanje toplote, tako da se materijal zagrijava, plastično deformiše i spaja u toplom stanju. Najveća primjena je kod zavarivanja sučeonih spojeva lima od legure aluminijuma u jednom prolazu debljine od 0.3 mm do 75 mm. U radu je dat i pregled jednog broja istraživanja postupka Zavarivanja trenjem sa miješanjem, koja se odnose na: limove različitih debljina i materijala, različitih spojeva, analizu mikrostrukture zavarenog spoja, tečenje materijala, praćenje temperature i komponenata sila, numeričke simulacije i mehanička ispitivanja. Dati su i budući pravci razvoja ove tehnologije.

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“…Among the many advantages of using FSW in the pipeline industry, reducing energy consumption up to 60% to 80% and problems associated with solidification are reduced or even eliminated [7,8]. Technology development focused on full-scale friction welding systems for pipeline steels is already being studied [7,9,10].…”

Section: Introductionmentioning

confidence: 99%