Conduction laser welding

Quintino, L.; Assunção, Eurico

doi:10.1533/9780857098771.1.139

Cited by 13 publications

(4 citation statements)

References 63 publications

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“…Since none of the standard filler metal compositions meet the stricter requirements of HEAs, further investigations into the competence of such alloys to perform as fillers are worthwhile, and focus has shifted in this direction. In the following, we use the Pickering and Jones convention [36,37] and label HEAs to reflect the atomic number of the elements. However, there are non-equiatomic configurations with more predominant elements in the composition over others; this results in the renaming of selected alloys.…”

Section: Introductionmentioning

confidence: 99%

RETRACTED: Laser Welding of UNS S33207 Hyper-Duplex Stainless Steel to 6061 Aluminum Alloy Using High Entropy Alloy as a Filler Material

2022

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The high entropy alloy (HEA) filler used during the fabrication method determines the reliability of HEAs for steel-aluminum dissimilar alloy configuration. HEAs have a direct impact on the formation of intermetallic compounds (IMC) formed by the interaction of iron (Fe) and aluminum (Al), and influence the size of the joint’s interaction zone. A novel welding process for Fe-Al alloy joints was developed to prevent the development of a brittle iron-aluminum interface. This research involved investigation of the possibility of using HEA powdered filler. Fe5Co20Ni20Mn35Cu20 HEAs was used as a filler for the laser joining lap configuration joining hyper-duplex stainless steel UNS S33207 to aluminum alloy 6061. This HEA has unique properties, such as high strength, good ductility, and high resistance to corrosion and wear. A tiny portion of the stainless-steel area was melted by varying the welding parameters. The high-entropy alloy (HEA) with slow kinetic diffusion and large entropy was employed to aid in producing solid solution structures, impeding the blending of iron and aluminum particles and hindering the development of Fe-Al IMCs. The weld seam was created without the use of Fe-Al IMCs,. The specimen broke at the HEAs/Al alloy interface with a tensile-shear strength of 237 MPa. The tensile-shear strength achieved was 12.86% higher than for the base metal AA 6061 and 75.57% lower than for the UNS S33207 hyper-duplex stainless steel.

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Section: Introductionmentioning

confidence: 99%

RETRACTED: Laser Welding of UNS S33207 Hyper-Duplex Stainless Steel to 6061 Aluminum Alloy Using High Entropy Alloy as a Filler Material

2022

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“…According to the calculations given in the appendix, the corresponding estimated laser power densities on the specimen surface were 1.06, 0.870 and 0.726 × 10 6 for 0, −1 and −2 mm focal point positions, respectively. These power densities are near the threshold for keyhole formation [17, 18]; however, the power density should be between 1.5 and 2 × 10 6 W/cm 2 to obtain a stable keyhole welding for aluminium alloys due to their high thermal conductivity and high reflection coefficient [19]. Therefore, the welds probably showed both the keyhole and conduction mode characteristics which might have led to an unstable mode of welding [5].…”

Section: Resultsmentioning

confidence: 99%

Characterisation of figure-eight shaped oscillation laser welding behaviour of 5083 aluminium alloy

Kabasakaloglu

Erdogan

2020

Science and Technology of Welding and Joining

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Figure-eight shaped oscillation movement of laser was studied to improve the welding quality of 5-mm-thick 5083 aluminium alloy. The tests were conducted at 3 kW laser power for frequency levels ranging from 25 to 125 Hz and focal point positions as 0, −1 and −2 mm. The quality of welds was characterised by non-destructive testing methods including visual, liquid penetrant and radiographic inspections. In addition, mechanical properties were determined by tensile tests and microstructures were examined by digital video camera and optical microscope. The results showed that welds with lower penetration depth and less porous structure could be obtained at 125 Hz frequency independent of the focal point position when compared to the joints produced without beam oscillation.

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“…Analysis of the weldability domain with core fiber reveals several information. First, considering that for most materials, it can be assumed that the keyhole welding mode is triggered for power density above 10 6 W.cm -2 [9], most of the weld achieved with core fiber seems to be in keyhole welding mode. It can explain the easy achieving of full penetration welds for most materials, excepting AW-6061 aluminum alloy, known to present high thermal conductivity, and high optical reflectivity [10].…”

Section: Resultsmentioning

confidence: 99%

Yb: YAG Laser Welding of Aeronautical Alloys

Alexis

Beguin

Cerra

et al. 2018

MSF

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Interest in the use of laser technology is growing in the aeronautical sector. The implementation of new Yb: YAG solid laser sources and new optical generations (dynamic focal length; 2in1 fiber: Fiber core and ring core) offers advantages in terms of quality, accuracy, reproducibility and weld dimensions. The LASER beam Yb: YAG of these new sources is generated, no longer from a bar of yttrium-aluminum garnet but from a disk. Moreover, a top-hat shaped power distribution and a top-hat shaped power distribution with a sharply limited recess in the center (ring structure) may be at the focal point using respectively the inner fiber and the coaxial fiber. These technological innovations offer new possibilities for cutting and welding of sheet metal parts. The welding domains of EN AW-6061 aluminum alloy, Commercial Purity Titanium - Grade 2 (T40), AISI 321 stainless steel alloy, nickel based Hastelloy X and Inconel 625 and cobalt based Haynes 188 superalloys are defined according to process parameters such as power density, focal diameter, welding speed and fiber type. Optimal welding parameters are determined for each alloy. The evolution of the microstructures and the mechanical properties of each zone of the welds are explained according to the power density, the heat input energy and the welding speed.

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Conduction laser welding

Cited by 13 publications

References 63 publications

RETRACTED: Laser Welding of UNS S33207 Hyper-Duplex Stainless Steel to 6061 Aluminum Alloy Using High Entropy Alloy as a Filler Material

RETRACTED: Laser Welding of UNS S33207 Hyper-Duplex Stainless Steel to 6061 Aluminum Alloy Using High Entropy Alloy as a Filler Material

Characterisation of figure-eight shaped oscillation laser welding behaviour of 5083 aluminium alloy

Yb: YAG Laser Welding of Aeronautical Alloys

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