Effect of laser beam welding on tear toughness of a 1420 aluminum alloy thin sheet

Shi, Yaowu; Zhong, Fei; Li, Xiaoyan; Gong, Shuili; Chen, Li

doi:10.1016/j.msea.2007.02.079

Cited by 36 publications

(19 citation statements)

References 6 publications

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“…The base metal is characterized by a laminated structure. The elongated grains are formed in a pancake shape with their interfaces or grain boundaries parallel to the rolling plane [5]. Figure 4 shows the typical optical microstructure of the joint by hybrid welding.…”

Section: Microstructure and Mechanical Propertiesmentioning

confidence: 99%

“…Chen and Huang studied the influence of welding parameters on the microstructures and mechanical properties of electron beam-welded 8090 Al-Li alloy plates [3]. Wei et al and Shi et al carried out a study on 1420 Al-Li alloy by FSW and laser welding, respectively [4,5]. However, some difficulties are encountered in welding Al-Li alloy through these methods.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and mechanical properties of laser-MIG hybrid welding of 1420 Al-Li alloy

Yan

Gao

et al. 2012

Int J Adv Manuf Technol

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This paper investigates the microstructure and mechanical properties of 1420 aluminum-lithium (Al-Li) alloy joints before and after heat treatment by CO 2 lasermetal inter gas (MIG) hybrid welding. The 5-mm-thick 1420 Al-Li alloy plates were welded by CO 2 laser-MIG hybrid welding. Full penetration joints without any defects were produced. Optic and scanning electron microscopy were used to study the microstructure and fractograph characteristics. The results show that the microstructures of the heat-affected zone (HAZ) and fusion zone exist as a predominantly discontinuous equiaxed dendritic structure and as a fine cellular dendritic structure, respectively. After heat treatment, the microstructures change from dendritic structure to a spheroidal crystal; the grain size of fusion zone is obviously larger than that of the base metal and the HAZ. Furthermore, the hardness recovers substantially to a level similar to that of the parent material. The tensile strengths of the joints in the as-welded condition and after heat treatment are 223 and 267 MPa, reaching up to 57 and 68 % of the parent materials' strength, respectively. The fractographs show that the joint as-welded condition exhibits the characteristics of dominated dimples and a small amount tear ridges, which are associated with the mixed ductile and brittle facture mechanisms. The fracture mode transforms from a transgranular to an intergranular after heat treatment; cleavage cracking coupled with an intergranular microvoid coalescence fracture mechanism occurs.

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Section: Microstructure and Mechanical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical properties of laser-MIG hybrid welding of 1420 Al-Li alloy

Yan

Gao

et al. 2012

Int J Adv Manuf Technol

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“…U saglasnosti sa slikom 6, UIE za leguru 1050A je mnogo veća za osnovni materijal nego za metal šava, videti sliku 7a. Ovo je verovatno zbog potpunog gubitka efekata obrade na hladno i stoga čvrstoće tokom TIG zavarivanja što je takođe saopšteno pri merenju tvrdoće i ispitivanju zatezanjem za leguru 1050A, poziv na Jedinica energije potrebna za naknadno širenje prsline do loma (UPE) predstavlja otpornost cepanju materijala [19] i takođe se shvata kao mera udarne žilavosti [44,54]. Slika 8 pokazuje dobijene vrednosti UPE koje potvrđuju potpuno različito prostiranje prslina u ove dve legure: otpornost na širenje prsline je mnogo veća u osnovnom materijalu od 5083 (171 N/mm) nego u osnovnom materijalu od 1050A (98 N/mm).…”

Section: žIlavostunclassified

“…Ovakvo ponašanje je razumljivo jer su granica otpornosti i zatezna čvrstoća legure 5083 generalno viših vrednosti nego kod legure 1050A, poziv na deo 3.3. Štaviše, vrednosti UPE (slika 8) su jasno više nego odgovarajuće vrednosti UIE (slika 7), što je uobičajeno za slučaj legura Al [19,44,55]. Visoka žilavost legure 5083, međutim, opada ako se prslina prostire kroz metal šava, videti sliku 8b.…”

Section: žIlavostunclassified

“…Poređenjem obe metode izračunavanja, razlika izračunatih UIE i UPE može da bude do 64%. Ovo naglašava potrebu za određivanjem stvarne vrednosti si kao što je pokazano u ovoj studiji, što je takođe urađeno i na drugim mestima [44]. Prslina se širi upravno na pravac opterećenja -unutar odstupanja od ± 20°, mnogo češće i unutar ± 10° (odvojeno od dve epruvete kod legure 5083).…”

Section: Slika 8 Jedinica Energije Za šIrenje (Upe) Zavisno Od Veličunclassified

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Continued from previous issue: Influence of grain size on mechanical properties of aluminium GTA weld metal

Schempp¹,

Häcker²,

Pittner³

et al. 2015

Zavarivanje i zavarene konstrukcije

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ŽilavostŽilavost osnovnog materijala i metala šava legura 1050A i 5083 određena je pri ispitivanju cepanjem. Slika 6 pokazuje dobijene krive sila-pomeranje, gde je svaka kriva, srednja vrednost 6 različitih ispitivanja cepanjem. Kao što se očekivalo, maksimalna opterećenja su bila niža kod epruveta od legure 1050A (slika 6a) nego kod legure 5083 (slika 6b) s obzirom na nižu čvrstoću legure 1050A u poređenju sa legurom 5083. Štaviše, razlika u žilavosti između osnovnog materijala i metala šava je veća za leguru 1050A i manja za leguru 5083. Iz svake krive silapomeranje, jedinice energije UIE i UPE su računate prema jednačinama (2) i (3). Srednja vrednost energije potrebne za nastanak prsline (UIE) prikazana je na slici 7. UIE je mera za zareznu žilavost [19]. U saglasnosti sa slikom 6, UIE za leguru 1050A je mnogo veća za osnovni materijal nego za metal šava, videti sliku 7a. Ovo je verovatno zbog potpunog gubitka efekata obrade na hladno i stoga čvrstoće tokom TIG zavarivanja što je takođe saopšteno pri merenju tvrdoće i ispitivanju zatezanjem za leguru 1050A, poziv na delove 3.2 i 3.3. Rezultujuće smanjenje UIE od osnovnog materijala ka metalu šava bio je samo blago izražen kod legure 5083, videti sliku 7b. Ovo se može objasniti vrlo malim stepenom obrade na hladno osnovnog materijala lima 5083 (manje od ⅛ tvrd) u poređenju sa hladno obrađenim osnovnim materijalom 1050A (½ tvrd). U odnosu na osnovni materijal, legura 1050A pokazuje veću otpornost na nastanak prslina (64 N/mm) nego legura 5083 (53 N/mm), što se ne reflektuje na različite čvrstoće obe legure (legura 1050A: 108 MPa, legura 5083: 143 MPa). Štaviše, rafinacija zrna znatno povećava vrednosti UIE metala šava za leguru 1050A, dok je taj efekat zanemarljiv za leguru 5083. Da bi se ovo objasnilo, mora se pozvati na to da je smanjenje srednje vrednosti veličine zrna bilo više izraženo u metalu šava od 1050A (-86%) nego u metalu šava od 5083 (-44%), poziv na sliku 3. Prečnik zareza kao značajan uticajni faktor vezan za nastanak prslina, meren je na svakoj epruveti pre ispitivanja i njegove vrednosti su bile u intervalu 0.05 i 0.15 mm za sve epruvete od obe legure. Sistemski uticaj prečnika zareza na UIE, međutim, nije nađen.

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Microstructures and mechanical properties of H62 brass-316L stainless steel in overlap welded joints by continuous-wave laser

Shen

et al. 2015

Int J Adv Manuf Technol

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Effect of laser beam welding on tear toughness of a 1420 aluminum alloy thin sheet

Cited by 36 publications

References 6 publications

Microstructure and mechanical properties of laser-MIG hybrid welding of 1420 Al-Li alloy

Microstructure and mechanical properties of laser-MIG hybrid welding of 1420 Al-Li alloy

Continued from previous issue: Influence of grain size on mechanical properties of aluminium GTA weld metal

Microstructures and mechanical properties of H62 brass-316L stainless steel in overlap welded joints by continuous-wave laser

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