Development of a new approach to resistance spot weld AW-7075 aluminum alloys for structural applications: an experimental study – Part 1

Bamberg, Pedro; Gintrowski, Gregor; Liang, Zhen; Schiebahn, Alexander; Reisgen, Uwe; Precoma, Nico; Geffers, Christoph

doi:10.1016/j.jmrt.2021.10.142

Cited by 18 publications

(12 citation statements)

References 19 publications

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“…7000 series aluminum alloys are beneficial for automotive structures, allowing obtaining improved mechanical and safety properties. However, their proneness to hot cracking and welding embrittlement, to join 7000 series sheets the mechanical methods, such as self-piercing rivets are predestined [98].…”

Section: Main Alloy Componentsmentioning

confidence: 99%

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Studies on Quality of Joints and Phenomena Therein for Welded Vehicle Components Made of Aluminium Alloy – a Review

Derbiszewski,

Obraniak,

Rylski

et al. 2024

Preprint

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To fulfil a need of limitation automotive emissions the reduction of vehicle weight is widely recommended and achieved in many ways, both by the construction of individual elements of the vehicle, and by the selection of light materials including Al alloys. Connecting these elements with each other and with elements made of iron alloys can be realized, inter alia, by welding or stir welding. However, the quality of the welds obtained varies widely and depends on many design, operational and environmental factors. The present study focused on a review of various welding technics used to joint both similar and dissimilar Al alloys utilized in automotive industry, the effect of various process parameters on welds quality, and phenomena appeared in such welds..

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Section: Main Alloy Componentsmentioning

confidence: 99%

“…Bamberg et al [98] realized the RSW of AW-7075 free of welding discontinuities providing proper weld lobe, electrode cap durability and better microstructure characteristics. The welding was conducted using upslope welding current, CuAg0.1 electrode caps and higher electrode force.…”

Section: Resistance Spot Welding Rswmentioning

confidence: 99%

Studies on Quality of Joints and Phenomena Therein for Welded Vehicle Components Made of Aluminium Alloy – a Review

Derbiszewski,

Obraniak,

Rylski

et al. 2024

Preprint

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“…Aluminum alloys with high amounts of alloying elements and extended mushy zone, such as Al2024 and Al7075, are more prone to weld solidification cracking [4]. So far, several investigations have been conducted to address this challenge for a variety of processes, including resistance welding [5,6], metal inert gas (MIG) welding [7,8], tungsten inert gas (TIG) welding [7,[9][10][11], laser welding [11,12], and electron beam welding [13,14]. Among effective approaches demonstrated so far are welding parameters optimization [7,10,15], using pulsed current instead of continuous current in arc welding [16,17], as well as switching from fusion welding to solid state welding methods such as friction welding [18] and friction stir welding [19,20].…”

Section: Introductionmentioning

confidence: 99%

An adapted approach for solidification crack elimination in Al7075 TIG welding

Abdollahi,

Nganbe,

Kabir

2024

Mater. Res. Express

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Solidification cracking is a long-standing issue in fusion welding of high-strength aluminum alloys like Al7075, imposing limitations on their aerospace and automotive applications. The current study introduces a novel adapted approach in solidification crack elimination by incorporating TiC nanoparticles into the fusion zone using a filler paste as an easier to fabricate alternative to filler metals investigated so far. To assess the weldability of the proposed method, 3-mm thick Al7075 sheets were TIG welded (i) autogenously without any TiC nanoparticles (autogenous), (ii) heterogeneously using 1 vol.% TiC-nanoparticle enhanced Al7075 filler metal (heterogeneous filler metal), and (iii) heterogeneously using an in-house fabricated Al7075 paste containing 1 vol.% TiC nanoparticles (heterogeneous filler paste). Macroscopic analysis of weld specimens proved that both heterogeneous welding approaches effectively eliminated solidification cracks. This was confirmed by Houldcroft solidification susceptibility index deduction tests that demonstrated a strong reduction in solidification crack susceptibly in all heterogeneous joints as compared to the autogenous joint. Microstructural analysis confirmed the transformation from columnar to equiaxed grain morphology in the fusion zone as crucial factor in crack elimination. Overall, the proposed filler paste method represents a highly cost-efficient approach for eliminating solidification cracks in TIG joining of difficult to weld aluminium alloys.

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“…Therefore, aluminum and its alloy applications are increasingly adopted, and they are being used in aerospace and automotive fields, which can efficiently realize weight loss, reduce fuel consumption, and prevent environmental pollution [ 3 , 4 ]. Generally, 7075 aluminum alloys have high specific strength and prime fracture toughness; simultaneously, they have preferable resistance to stress corrosion cracking, which can guarantee their broad application [ 5 ]. In the aerospace field, they has been used to manufacture aircraft structures, fuselage shells, wings, propellers, and landing gear components [ 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

Deformation Behavior of an Extruded 7075 Aluminum Alloy at Elevated Temperatures

Ye,

Xia,

Qiu

et al. 2024

Materials

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Hot compression tests were conducted to explore the deformation behavior of an extruded 7075 aluminum alloy bar at elevated temperatures. Specimens with 0°, 45°, and 90° angles along the extrusion direction were prepared. The compression temperatures were 300 and 400 °C, and the strain rates ranged from 0.001 to 0.1 s−1. The corresponding microstructures were characterized via OM and TEM, and the macroscopic texture was tested using XRD. The results indicated that the strength of the 7075 alloy decreases with higher compression temperatures and is in a proportional relationship with respect to the strain rate. During high-temperature compression, it is easier to stimulate atomic diffusion in the matrix, which can improve thermal activation abilities and facilitate dynamic recovery and dynamic recrystallization. In addition, the coarsening of precipitates also contributed to dynamic softening. When compressed at 300 °C, the stress levels of the 0° specimens ranked first, and those for the 45° specimens were the lowest. When compressed at 400 °C, the flow stresses of the specimens along three directions were comparable. The anisotropic mechanical behavior can be explained by the fiber grains and brass {011} <211> texture component. However, higher temperature deformation leads to recrystallization, which can weaken the anisotropy of mechanical properties.

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Development of a new approach to resistance spot weld AW-7075 aluminum alloys for structural applications: an experimental study – Part 1

Cited by 18 publications

References 19 publications

Studies on Quality of Joints and Phenomena Therein for Welded Vehicle Components Made of Aluminium Alloy – a Review

Studies on Quality of Joints and Phenomena Therein for Welded Vehicle Components Made of Aluminium Alloy – a Review

An adapted approach for solidification crack elimination in Al7075 TIG welding

Deformation Behavior of an Extruded 7075 Aluminum Alloy at Elevated Temperatures

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