Laserstrahlschweißen der Al-Mg-Si-Cu-Legierung 6013

Meyer, B.; Lectard, E.; Serrano, Nicanor L.; Zschech, Ehrenfried; Hirsch, Thomas; Mayr, P.

doi:10.1515/htm-1997-520508

Cited by 3 publications

(1 citation statement)

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“…6,7 Weldments of alloy 6013 have been produced using a CO 2 laser and Al-Si filler wires (Al-5%Si and Al-12%Si). 8,9 This alloy has also been welded with an Nd : YAG (neodymium : yttrium-aluminiumgarnet) laser and various filler powders. [10][11][12] High joint efficiencies were obtained using silicon rich filler metals.…”

Section: Introductionmentioning

confidence: 99%

Laser beam welding of Al–Mg–Si–Cu alloy 6013 sheet using silicon rich aluminium filler powders

Braun¹

2005

Materials Science and Technology

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Butt welds of 1 . 6 mm thickness sheet of the Al-Mg-Si-Cu alloy 6013 were produced using a 3 kW Nd : YAG (neodymium : yttrium-aluminium-garnet) laser. The sheet was welded in the T4 and T6 temper conditions using filler powders of alloys Al-5%Mg, Al-12%Si, Al-20%Si and Al-40%Si. Microstructure, hardness profile, tensile properties and corrosion behaviour of the welds were investigated in the as welded conditions and after a post-weld heat treatment to the T6 temper. Pores were observed in the fusion zone, which exhibited a dendritic microstructure. Post-weld artificial aging increased the hardness in the fusion zone owing to precipitation of strengthening phases. Joint efficiencies between 80 and 90% were achieved for 6013 alloy welds in the as welded T4 condition. After a post-weld heat treatment to the T6 temper, the strength approached 90% of the ultimate tensile strength of the base material 6013-T6 for welds made with silicon rich filler powders. Joints in the as welded T4 and post-weld heat treated T6 temper conditions suffered pitting when exposed to an intermittent acidified salt spray fog. In the as welded T6 condition, welds exhibited zones adjacent to the fusion boundaries that were not corroded. These corrosion free zones were not observed after alternate immersion tests in 3 . 5%NaCl solution. As welded 6013-T4 joints were susceptible to stress corrosion cracking in the heat affected zone when immersed in an aqueous chloride-bicarbonate solution.

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Section: Introductionmentioning

confidence: 99%

Laser beam welding of Al–Mg–Si–Cu alloy 6013 sheet using silicon rich aluminium filler powders

Braun¹

2005

Materials Science and Technology

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Structure‐property investigations on a laser beam welded dissimilar joint of aluminium AA6056 and titanium Ti6Al4V for aeronautical applications Part I: Local gradients in microstructure, hardness and strength

Vaidya¹,

Horstmann²,

Ventzke³

et al. 2009

Materialwissenschaft Werkst

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Sheets of AA6056 and Ti6Al4V were butt-joined by inserting the Ti-sheet into the profiled Al-sheet and by melting the Al-alloy alone using a split beam Nd:YAG laser.To study microstructural effects on properties, the Al-alloy was used in two tempers; T4followed by post weld heat treatment T6, and in T6 followed by a defined duration of natural ageing at room temperature. As a basic step for fatigue and fracture investigations, local gradients in properties of this dissimilar joint are investigated using microscopy, hardness and tensile tests. Possible sites, from which fracture may initiate, have been then identified. All property changes are found to confine to the aluminiumside. An intermetallic layer, although very thin, is found to form on the interface. The changeovers, firstly between the fusion zone and the heat affected zone and secondly between the heat affected zone and the base material, are found to be associated with changes in microstructure, hardness and strength. These are identified as the possible critical sites in addition to the interface. Fig. 1 to follow) for further weight saving and economy, since a specific material can be chosen for a specific local requirement. However, dissimilar welds are a metallurgical challenge [4]. Local gradients in microstructure, chemistry and properties become inherent and need to be accounted for in design.Moreover, when a non-ferrous partner is involved, intermetallic phases formed tend to be brittle [4] and consequently properties of the weld are impaired. Residual stresses [5] at the interface and in the partners may complicate the matter further.With weight alone as the criterion, three base metals become interesting on the density basis; magnesium, aluminium and titanium. Magnesium is, however, yet to find acceptance for wide aerospace applications and so only Al-and Ti-alloys become relevant for dissimilar joints. Some physical properties collected from the literature [6] are shown in In the following, the terminology "welding" [25] has been retained, since at least one partner was melted (and thus it is not considered as brazing). The partners are also referred to synonymously by the respective side, e.g., AA6056 as the Al-side.Moreover, specimens from the laboratory coupons (and not the component in Fig. 1c) have been tested. Experimental procedureSheets of the precipitation hardenable AlMgSiCu type alloy, AA6056 (uniform thickness 2 mm) and Ti6Al4V (thickness 1.8 mm; mill annealed) were welded to coupons as shown in Figs. 1a,b using a split beam 4 kW Nd:YAG laser in the heat conduction mode at BIAS in Bremen, Germany, without using filler wire. The coupon had the dimensions 330 x 94 mm 2 . To study the effect of starting microstructure on properties two tempers were selected for AA6056:• welding in T4 followed by artificial ageing T6 (190 °C-4h/air); denoted also as "T4/T6" or "T4 followed by post weld heat treatment T6", and• welding in T6 and naturally aged (at least for 7 weeks) without any further artificial ageing; denoted also as "T6...

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Dispersoid-free zones in the heat-affected zone of aluminum alloy welds

Meyer

Doyen

Emanowski

et al. 2000

Metall Mater Trans A

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The local microstructure in the heat-affected zone 1 (HAZ1) of a laser beam-welded Al-Mg-Si-Cu aluminum alloy is investigated closely. Dispersoid-free zones (DFZs), where the dispersoids of the base material (BM) are dissolved, are found in the vicinity of the fusion line (FL). They are not uniformly surrounding a grain, but oriented toward the FL. Their width can be as large as 10 m. Detailed analysis has revealed a decreased silicon concentration as well as a decreased hardness of the oriented dispersoid-free zones (ODFZs). Two mechanisms for the formation of this welding metallurgical feature are discussed.

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Laserstrahlschweißen der Al-Mg-Si-Cu-Legierung 6013

Cited by 3 publications

References 0 publications

Laser beam welding of Al–Mg–Si–Cu alloy 6013 sheet using silicon rich aluminium filler powders

Laser beam welding of Al–Mg–Si–Cu alloy 6013 sheet using silicon rich aluminium filler powders

Structure‐property investigations on a laser beam welded dissimilar joint of aluminium AA6056 and titanium Ti6Al4V for aeronautical applications Part I: Local gradients in microstructure, hardness and strength

Dispersoid-free zones in the heat-affected zone of aluminum alloy welds

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