PSI - Issue 28

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 ila le lin t . ie ir t. i i tructural Integrity Procedia 0 (2019) 0– 0

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Procedia Structural Integrity 28 (2020) 132–138

© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo Abstract Al alloys, conceived for automotive and aeronautic applications thanks to the high strength/density ratio, exhibit weldability issues common to all light alloys. In particular loss of toughness and soundness of welded joints consequent upon welding operations, possible cracking in the weld metal and metallurgical modifications induced in the heat affected zone. In this paper the weldability of AA2139, AA6110 and AA6156 with the same filler of AA4047 was investigated by comparing features of welds carried out by Nd:Yag laser process. Some samples have been welded of different Al alloys. Welded joints were submitted to optical and SEM metallographic examinations with EDS. Microanalysis measurements were performed to evaluate locally chemical composition and to investigate the nature of the precipitates. Mechanical properties were evaluated through tensile test (T-pull and Hoop stress) and fatigue test (T-pull and Hoop stress). One of the main results is the goodness of this kind of welding between the different alloys for mechanical properties and metallographic features. In particular the configuration AA6156-AA2139-AA4047 is typical for resistance structure in aircraft applications, consisting in extruded AA2139 stringer, responsible to absorbing structural loads and AA6156 skin with high corrosion and crack propagation resistance. © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo Keywords: Al alloys, Laser welding, Nd:YAG, mechanical properties, t-pull, hoop stress. 1. Introduction Aluminum alloys, due to the high mechanical resistance/specific density ratio, are very attractive for the needs of the automotive and aeronautic industry as evidenced by Immarigeon et al. (1995), Wagner (2005) and Warner (2006). str ct l a l s, c cei e f r a t ti e a aer a tic a licati s t a s t t e hi stre t / e sit rati , e i it wel a ilit i s es c t a l li t a l s. I artic lar l s f t e s a s e s f el e j i ts c se e t el i erati s, si le crac i i t e el etal a eta l r ical m ificati s i ce i t e heat a fecte z e. I t is a er t e el a ilit f , a it t e sa e fi ler f as i esti ate c ari feat res f el s ca rie t : a laser r ce s. e sa les a e e el e f i fere t l a l s. el e j i ts ere s i te t tical a eta l ra ic e a i ati s it . icr a al sis eas re e ts ere erf r e t e al ate l ca l c e ical c siti a t i esti ate t e nat re of t e preci itates. Mec a ical pr erties were e al ate t r te sile test ( - l a H stre s) a fati e test ( - l a stre s). e f t e ai res lts is t e e s f t is i f el i et e t e i fere t a l s f r ec a ical r erties a eta l ra ic feat res. I artic lar t e c fi rati - - is t ical f r resista ce str ct re i aircraft a licati s, c sisti i e tr e stri er, res si le t a s r i str ct ral l a s a s i it i c r si a crac r a ati resista ce. © 2 he Aut ors. Publis e y ELSEVI . . This is a open access article nder t e C - -ND license ( t s: /creativecom ns.org/lice ses/by- c- / . ) er-re ie un er responsibilit of t e uropea Str ct ral Inte rity Society ( I ) ey ords: Al a loys, Laser welding, Nd: , mechanical properties, t-pu l, h op stre s. . I t ti l i l s, t t i i l r sist /s ifi sit r ti , r r tr ti f r t t t ti r ti i str s i I ri t l. ( ), r ( ) r r ( 1st Virtual European Conference on Fracture Mechanical behavior of Nd:YAG laser welded aluminum alloys Girolamo Costanza a)* , Maria Elisa Tata b) a Industrial Engineering Department, University of Rome Tor Vergata, Via del Politecnico, 1- 00133, Rome, Italy b Computer Science and Civil Engineering Department, University of Rome Tor Vergata, Via del Politecnico, 1- 00133, Rome, Italy t irt l r f r r t r i l t a) , i li t ) a Industrial Engin ering Depart ent, University of Ro e Tor Vergata, Via del Politecnico, 1- 01 3, Ro e, Italy b o puter Science and Civil Engin ering Depart ent, University of Ro e Tor Vergata, Via del Politecnico, 1- 01 3, Ro e, Italy

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* Corresponding author. Tel.: +39-06-72597185; fax: +39-06-2021351. E-mail address: costanza@ing.uniroma2.it * Co responding author. Tel.: +39-06-72597185; fax: +39-06-2021351. - ail a dre s: costanza ing.uniro a2.it

2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo 2452-3216 © 2020 The Authors. Published by E I B.V. his is an open a ce s article under the C B - - license (h tps: /creativeco ons.org/licenses/by-nc-nd/4.0) er-revie under responsibility of the European Structural Integrity Society ( I ) Ex o

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo 10.1016/j.prostr.2020.10.017