Mechanical behaviour of AA 7475 friction stir welds with the kissing bond defect

Kadlec, Martin; Růžek, Roman; Nováková, Lucie

doi:10.1016/j.ijfatigue.2014.12.011

Cited by 78 publications

(39 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The EDX mapping analysis indicated the oxide layers in these locations ( Figure 13) that confirms the existence of kissing bonds [10,32,33]. It is difficult to measure the actual size of kissing bond due to interruption within (Figure 12c), however our observation says that in the lower welding speed (63 mm/min), the shortest kissing bond was occurred.…”

Section: Tensile Properties and Fractographysupporting

confidence: 52%

“…No imperfection was found in macroimage, however over etching of the cross sections in Keller agent accompanied with using optical microscopy in some samples and SEM in others, reveal the discontinuities near the root, as well as, the border of NZ and TMAZ in A, which confirms the existence of kissing bonds [10,32,33]. It is difficult to measure the actual size of kissing bond due to interruption within (Figure 12c), however our observation says that in the lower welding speed (63 mm/min), the shortest kissing bond was occurred.…”

Section: Tensile Properties and Fractographymentioning

confidence: 76%

See 1 more Smart Citation

Effect of the Welding Speed on the Macrostructure, Microstructure and Mechanical Properties of AA6061-T6 Friction Stir Butt Welds

Fadaeifard

Матори

Aziz

et al. 2017

Metals

View full text Add to dashboard Cite

Friction stir welding of aluminum alloys has been progressively used in different industries on the ground of higher welding quality in comparison to fusion welding. In this article, friction stir welding of 6061-T6 aluminum alloy with 9.6 mm thickness was carried out by using three different welding speeds (63, 89 and 110 mm/min). The effect of welding speed on macro-and microstructure, micro hardness, tensile properties and kissing bond was investigated. Results show that the Low Hardness Zone was moved toward the weld center by increasing the welding speed. The average micro hardness in the weld nugget zone increased from 60.1 to 67.6 HV with the raise of welding speed from 63 to 110 mm/min. Thermo Mechanical Affected Zone was clearly revealed using Electron backscatter diffraction (EBSD). The kissing bond was studied by Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray (EDX) mapping. It was proven that the damaging effect of kissing bond was linked to location of this discontinuity, although the growth of kissing bond was linked to higher welding speed. The maximum value of Ultimate Tensile Strength (UTS) (159 MPa) was obtained at 110 mm/min, whereas the Yield Strength (YS) in the sample at 89 and 110 mm/min welding speed exhibit the same trend with 137 MPa and 134 MPa respectively.

show abstract

Section: Tensile Properties and Fractographysupporting

confidence: 52%

Section: Tensile Properties and Fractographymentioning

confidence: 76%

Effect of the Welding Speed on the Macrostructure, Microstructure and Mechanical Properties of AA6061-T6 Friction Stir Butt Welds

Fadaeifard

Матори

Aziz

et al. 2017

Metals

View full text Add to dashboard Cite

show abstract

“…It was noted that weld root flaws below a length of 0.35 mm had very little impact on the fatigue performance; however, flaws above this value were detrimental to fatigue life. Following this, Kadlec et al [11] found the critical length to be 0.30 mm in AA7475-T7351 aluminium alloy therefore drawing similar conclusions. Additional research [12] also highlighted the negative effect of the weld root flaw on fatigue performance of FSW 2024-T3 aluminium alloys.…”

Section: Introductionmentioning

confidence: 63%

“…5d) was observed and this has been found to negatively affect the fatigue performance [7,[9][10][11]. The tip of the notch has a large stress concentration factor associated with it which can initiate cracks.…”

Section: Process Related Flawsmentioning

confidence: 98%

Fatigue and bending behaviour of friction stir welded DH36 steel

Fowler

Toumpis

Galloway

2015

Int J Adv Manuf Technol

View full text Add to dashboard Cite

Friction stir welding presents many advantages over conventional welding techniques; however, there is limited published data with regards to the fatigue and bending performance of friction stir welded steels. Hence, this investigation aims to evaluate friction stir welded DH36 steel subjected to these loading conditions. A comprehensive fatigue and bending programme has been implemented to assess the impact of process related features, such as weld root flaws, on the welds' performance. Strain gauges located on the top and bottom surfaces of fatigue samples allowed the secondary bending stresses to be quantified when clamped in the fatigue test machine. Bend test samples were completed to a 180° Ubend for as-welded and ground samples. The bend testing programme demonstrated satisfactory performance of friction stir welded DH36 steel. Despite the presence of surface flaws, cracks did not propagate in bending indicating adequate levels of toughness. Fatigue performance was poor in comparison with results from similar welds however, it was found to be acceptable in terms of class recommendations for fusion welding. This lower performance was predominantly attributed to a weld root flaw. Strain gauge measurements indicated that the local stress at the weld root was up to 25% lower than the nominal stress determined prior to testing, thus artificially improving fatigue performance. Welds of good quality and refined microstructure were found, however process related flaws on the top and bottom surface emphasise the need for optimisation of the tool material and welding parameters.

show abstract

“…Sabendo que o alumínio puro apresenta módulo de elasticidade igual 69 GPa, os valores de Eit associados a ¾ da espessura aproximam mais deste. Ao se comparar os valores associados ao limite de escoamento (Hit) e ductilidade (nit) obtidos através da nanoindentação instrumentada com os valores obtidos através do ensaio de tração uniaxial para uma chapa da liga de alumínio 7475-T751 com uma espessura de 6,35 mm no qual foram aproximadamente 430 MPa, e 16,5 %, respectivamente [6], pode-se observar que os valores obtidos pelo ensaio de nanoindentação são muito superiores. Ou seja, as propriedades medidas na nanoindentação instrumentada indicam uma tendência e estão vinculados a condições microestruturais locais.…”

Section: Tabelaunclassified

A Utilização Da Nanoindentação Instrumentada Para Caracterização De Materiais Metálicos

Diniz¹,

Paula²,

Brandão³

2018

ABM Proceedings

View full text Add to dashboard Cite

ResumoO presente trabalho buscou explorar a aplicação da nanoindentação instrumentada na caracterização microestrutural e mecânica de materiais metálicos. Para isso foi utilizado um ultramicrodurômetro (Shimadzu, modelo DUH-211S) e um microscópio (Olympus, modelo BX51M) a fim de analisar uma chapa laminada a quente de uma liga de alumínio 7475-T7351. De acordo com algumas das possibilidades apresentadas, pode-se concluir que a nanoindentação instrumentada é uma ferramenta poderosa para a caracterização de materiais metálicos. Palavras-chave: Nanoindenteção instrumentada; Propriedades mecânicas; Microestrutura; Liga de alumínio 7475-T7351. THE APPLICATION OF THE INSTRUMENTED NANOINDENTATION TO METALLIC MATERIAL CHARACTERIZATION AbstractThis study aimed to explore the application of instrumented nanoindentation on the microstructural and mechanical characterization of metallic materials. For this was used an ultramicrohardness (Shimadzu, model DUH-211S) and an optical microscope (Olympus, BX51M model) in order to analyze a 7475-T7531 aluminum alloy samples hot rolled sheet. According to the some possibilities presented, it can be concluded that the instrumented nanoindentation is a powerful tool for the characterization of metallic materials.

show abstract

Mechanical behaviour of AA 7475 friction stir welds with the kissing bond defect

Cited by 78 publications

References 26 publications

Effect of the Welding Speed on the Macrostructure, Microstructure and Mechanical Properties of AA6061-T6 Friction Stir Butt Welds

Effect of the Welding Speed on the Macrostructure, Microstructure and Mechanical Properties of AA6061-T6 Friction Stir Butt Welds

Fatigue and bending behaviour of friction stir welded DH36 steel

A Utilização Da Nanoindentação Instrumentada Para Caracterização De Materiais Metálicos

Contact Info

Product

Resources

About