The effect of shielding gas composition on the toughness and crack growth parameters of AlMg4,5Mn weld metals

Prokić-Cvetković, Radica; Kastelec-Macura, S.; Milosavljević, Aleksandra; Popović, Olivera; Burzić, Meri

doi:10.2298/jmmb1002193p

Cited by 11 publications

(9 citation statements)

References 5 publications

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“…With the lowest shielding gas flow rate, the highest oxidation of the molten metal and thus the highest microhardness values were observed. Prokić-Cvetković [58] achieved similar results when He was utilized as a protective gas. The hardness values of the WM were slightly higher, leading to the conclusion that a higher quantity of helium increased the hardness.…”

Section: Microhardness Measurementsmentioning

confidence: 73%

“…The radius of the biggest pore was 0.42 mm. The porosity and cracking of weld joints are the main problems in aluminum welding due to the high thermal expansion coefficient of Al, the large change in the volume upon solidification, and the wide solidification temperature range [58][59][60][61]. In the weld joints created under variable shielding gas flow rates, hot cracking was not detected.…”

Section: Appearance Of Laser Weldsmentioning

confidence: 99%

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The Effect of Process Parameters on the Microstructure and Mechanical Properties of AW5083 Aluminum Laser Weld Joints

Vyskoč

Dománková

Jurči

et al. 2020

Metals

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In this article, the effect of process parameters on the microstructure and mechanical properties of AW5083 aluminum alloy weld joints welded by a disk laser were studied. Butt welds were produced using 5087 (AlMg4.5MnZr) filler wire, with a diameter of 1.2 mm, and were protected from the ambient atmosphere by a mixture of argon and 30 vol.% of helium (Aluline He30). The widest weld joint (4.69 mm) and the highest tensile strength (309 MPa) were observed when a 30 L/min shielding gas flow rate was used. Conversely, the narrowest weld joint (4.15 mm) and the lowest tensile strength (160 MPa) were found when no shielding gas was used. The lowest average microhardness (55.4 HV0.1) was recorded when a 30 L/min shielding gas flow rate was used. The highest average microhardness (63.9 HV0.1) was observed when no shielding gas was used. In addition to the intermetallic compounds, β-Al3Mg2 and γ-Al12Mg17, in the inter-dendritic areas of the fusion zone (FZ), Al49Mg32, which has an irregular shape, was recorded. The application of the filler wire, which contains zirconium, resulted in grain refinement in the fusion zone. The protected weld joint was characterized by a ductile fracture in the base material (BM). A brittle fracture of the unshielded weld joint was caused by the presence of Al2O3 particles. The research results show that we achieved the optimal welding parameters, because no cracks and pores were present in the shielded weld metal (WM).

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Section: Microhardness Measurementsmentioning

confidence: 73%

Section: Appearance Of Laser Weldsmentioning

confidence: 99%

The Effect of Process Parameters on the Microstructure and Mechanical Properties of AW5083 Aluminum Laser Weld Joints

Vyskoč

Dománková

Jurči

et al. 2020

Metals

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“…The need to reduce vehicle weight and emissions and to make fuel savings has led to an increase in the use of lightweight materials, such as aluminum alloys. Among them, AlMg4.5Mn alloy stands out, used in many areas, such as tanks for storage and pipelines for transportation of liquid gases, for pressure vessels in general, in vehicles, and more recently as the main material for the construction of yachts and ships [ 1 ]. It is characterized by high strength and good resistance to corrosion and wear, as well as relatively good weldability [ 1 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Shielding Gas Arc Welding Process on Cavitation Resistance of Welded Joints of AlMg4.5Mn Alloy

et al. 2023

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The effect of the shielding gas arc welding process on the cavitation resistance of the three-component aluminum alloy AlMg4.5Mn and its welded joints was investigated. Welding was performed using the GTAW and GMAW processes in a shielded atmosphere of pure argon. After the welding, metallographic tests were performed, and the hardness distribution in the welded joints was determined. The ultrasonic vibration method was used to evaluate the base metal’s and weld metal’s resistance to cavitation. The change in mass was monitored to determine the cavitation rates. The morphology of the surface damage of the base metal and weld metal due to cavitation was monitored using scanning electron microscopy to explain the effect of the shielding gas arc welding process on their resistance to cavitation.

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“…Since the fatigue crack in this case would propagate through both the heat affected zone and the parent material (due to welded joint geometry), each of these regions was analysed separately, taking into account its corresponding crack length. There was a total of three HAZ and PM model combinations, with slightly increased HAZ/decreased PM crack length and vice versa, whereas the total crack length was always 5 mm (due to the measuring foils used, RMF 5) [15].…”

Section: Introductionmentioning

confidence: 99%

Analytical vs Numerical Calculation of Fatigue Life for Different Welded Joint Regions

et al. 2020

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This research will show the analytical way of determining the remaining life of a welded joint with a fatigue crack initiated in its heat affected zone. The calculation will be divided into two stages, since the fatigue crack propagated through the heat affected zone, and then through the parent material. The analysis will be related to specimens with different fatigue properties taken into account for both regions. These calculations included a number of models, since different crack lengths were used for the heat affected zone and the parent material. There were three pairs of different HAZ vs PM fatigue crack lengths, always with the assumption that the total crack length is 5 mm, due to measuring range of the used measuring foils. The aim of this analysis was to apply method typically used in fracture mechanics in order to determine the number of cycles in a welded joint with an initiated fatigue crack, depending on a number of parameters. Obtained results were then compared to the results from the numerical analysis for the same cases. While the total number of cycles was mostly unaffected by these changes, some noticeable differences were observed between individual welded joint regions in question, the heat affected zone and the parent material.

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The effect of shielding gas composition on the toughness and crack growth parameters of AlMg4,5Mn weld metals

Cited by 11 publications

References 5 publications

The Effect of Process Parameters on the Microstructure and Mechanical Properties of AW5083 Aluminum Laser Weld Joints

The Effect of Process Parameters on the Microstructure and Mechanical Properties of AW5083 Aluminum Laser Weld Joints

Effect of Shielding Gas Arc Welding Process on Cavitation Resistance of Welded Joints of AlMg4.5Mn Alloy

Analytical vs Numerical Calculation of Fatigue Life for Different Welded Joint Regions

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