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Title:Influence of kinematic factors of friction stir welding on the characteristics of welded joints of forged plates made of EN AW 7049 A aluminium alloy
Authors:Perović, Milenko (Author)
Baloš, Sebastian (Author)
Kozak, Dražan (Author)
Bajić, Darko (Author)
Vuherer, Tomaž (Author)
Files:.pdf Tehnicki_vjesnik_2017_Perovic_et_al._Influence_of_kinematic_factors_of_friction_stir_welding_on_the_characteristics_of_welded_joints_of.pdf (2,13 MB)
MD5: 7A9D65145D1E3913544021430A912232
 
URL http://hrcak.srce.hr/183029
 
Language:English
Work type:Scientific work (r2)
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Abstract:In this paper, the influence of rotation speed and welding speed on the impact strength, microstructure and cross section micro hardness of FSW welded joints of Al-Zn-Mg-Cu high strength aluminium alloy is studied. Rotation speed was varied from 750 min−1 to 850 min−1 and welding speed from 60 mm/min to 80 mm/min. It was found that the energy of crack propagation is up to three times higher than the energy of crack initiation. This ratio was found by testing the Charpy notched specimens taken from left and right from the weld centre, 4 mm from the notch in a direction opposite to a direction of welding. Micro hardness distribution in the nugget does not show large dissipation of value regardless if the measuring point is in the upper or lower section of the nugget. Weld microstructure characteristics and zones are clearly defined at the basis of grain size and material flow.
Keywords:dynamic recrystallization, friction stir welding, impact strength, micro hardness distribution
Year of publishing:2017
Number of pages:str. 723-728
Numbering:št. 3, Letn. 24
ISSN:1330-3651
UDC:621.791
ISSN on article:1330-3651
COBISS_ID:20642326 New window
NUK URN:URN:SI:UM:DK:NFH3XPDS
Views:638
Downloads:290
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Categories:Misc.
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Record is a part of a journal

Title:Tehnički vjesnik
Shortened title:Teh. vjesn.
Publisher:Strojarski fakultet u Slavonskom Brodu, Elektrotehnički fakultet u Osijeku, Građevinski fakultet u Osijeku
ISSN:1330-3651
COBISS.SI-ID:15346181 New window

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:12.07.2017

Secondary language

Language:Croatian
Title:Utjecaj kinematičkih faktora zavarivanja trenjem miješanjem na karakteristike zavarenog spoja kovanih ploča od legure aluminija EN AW 7049 A
Abstract:U radu se analiziraju utjecaji broja okretaja i brzine zavarivanja na udarnu žilavost, metalografska obilježja i raspodjelu mikrotvrdoće po površini poprečnog presjeka FSW zavarenog spoja kovanih ploča od visokočvrste legure aluminija faznog sastava Al-Zn-Mg-Cu. Broj okretaja je mijenjan u rasponu od 750 min−1 do 850 min−1, a brzina zavarivanja od 60 mm/min do 80 mm/min. Razdvajanjem energije inicijacije pukotine od energije potrebne za njezinu propagaciju, uočava se da je čak i do tri puta veća vrijednost energije koja je potrebna za njezinu propagaciju. Odnos energije inicijacije i energije propagacije je dobiven ispitivanjem Charpy epruvete sa zarezom u središtu, lijevo i desno od središta metala šava 4 mm u smjeru suprotnom od smjera zavarivanja. Distribucija mikrotvrdoće metala šava ne pokazuje veliko rasipanje vrijednosti bez obzira da li je mjerno mjesto u gornjoj ili donjoj razini površine zavarivanih komada. Na mikrograficima jasno se uočavaju zone strukturnih sadržaja zavarenog spoja na osnovi veličine zrna i linija tečenja materijala.
Keywords:dinamična rekristalizacija, varjenje s trenjem, udarna trdnost, mikrotrdota


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