Effect of process parameters on the strength of resistance spot welds in 6082-T6 aluminium alloy

Pereira, A.M.; Ferreira, J.A.M.; Loureiro, A.; Costa, J.D.; Bartolo, Paulo Jorge Da Silva

doi:10.1016/j.matdes.2009.11.052

Cited by 89 publications

(48 citation statements)

References 23 publications

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“…The nugget size increasing until expulsion occurs. The results agree with different studies, see Ref (Aslanlar et al, 2007;Pereira, Ferreira, Loureiro, Costa, & Bártolo, 2010;Moshayedi & Sattari-Far, 2012). The increasing current, i.e.…”

Section: Effect Of Current On Joint Strength and Weld Nugget Areasupporting

confidence: 93%

Mechanical Properties Investigation of Multi-Lap Stainless Steel Sheets

Al-Attaby¹,

Al-Jumaili²

2015

JMSR

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The mechanical testing and microstructers for austenititc stainless steel have been carried out to indicate the effect of the localized heating on the spot welds. The results indicated that the increasing of the heating will increase the tensile shear strength rapidly up to the expulsion point. Therefore, the hardness increases with the increasing of the weld nugget area. Hence, the fracturing tendencies have been observed inside the nugget. Nevertheless, the outer surface cracking is developed by adding a thin layer of pure metals between the two stainless steel 304L sheets. It was shown that the addition of pure metals, 3-lap sheets decreases the joint strength as compared with the 2-lap joints for the same parameters. The effect of micro cracking and the intensive brittleness decreases the joint strength. The excessive cracking was observed in 3-lap as compared with the 2-lap joint.

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Section: Effect Of Current On Joint Strength and Weld Nugget Areasupporting

confidence: 93%

Mechanical Properties Investigation of Multi-Lap Stainless Steel Sheets

Al-Attaby¹,

Al-Jumaili²

2015

JMSR

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“…Therefore, cross-nugget failure occurs easily, leading to a low shear load, as discussed by Khodabakshi et al [26]. On the other hand, complete pull nugget failure mode was observed in the joint displaying maximum shear load value, as shown in Figure 3(b), which was proposed by the AWS standard and also reported in several other works [5,27]. …”

Section: Failure Modesupporting

confidence: 53%

“…The investigation of this change is most important for the safety and quality of the welded joints [3,4]. Welding time, welding current and load applied on the electrode prior to transmitting the welding current exhibit important effects on mechanical properties due to their influence on current flow [5]. An increase in weld current and heat input increased the failure load of spot welds on carbon and stainless steels, aluminum and magnesium alloys [3,[6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Effect of Process Parameters on the Mechanical Properties and Failure Behavior of Spot Welded Low Carbon Steel

et al. 2015

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In this research, the effect of spot welding parameters on weld quality was investigated. The main affecting welding parameters such as weld current, weld time, electrode force and holding time were determined as the basis for quality evaluation. The selected quality features were classified into mechanical properties and failure behavior, which were required for application with highly dynamic loading. The peak load as one of the important mechanical properties, as well as the two distinct failure modes which were cross-nugget and complete button pull, were observed using tensile-shear stress. To obtain detailed shear stress testing results and to determine the significance of parameters, a servo-hydraulic testing machine was run at a constant cross-head speed of 2mm/min followed by statistical analysis methods, which were Taguchi's L 16 orthogonal array and Analysis of Variance (ANOVA). Furthermore, the failure mode was to be observed based on the fracture surface used as reference for acceptance or rejection of the weld joint. Based on the results, the weld current was the significant factor affecting shear stress and the complete button pull was mostly found, which leads to the satisfactory condition of the joint. Cross-nugget and full button pull-out were the dominant failures observed in the lap-shear test. The cross-nugget failure leads to a low shear load, while complete button pull-out displays maximum shear load.

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“…On the other hand, RSW of steel and aluminum results in a non-uniform hardness distribution. Hardness in the FZ of steel spot welds is higher than the BM [54], while it's lower in the FZ of aluminum spot welds than the BM [55]. The uniform hardness distribution in Mg spot welds can be considered a minor advantage compared with aluminum spot welds, under loading which causes nugget failure.…”

Section: Microstructurementioning

confidence: 99%

Characterization of magnesium spot welds under tensile and cyclic loadings

2011

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Resistance spot welds of a magnesium alloy were characterized in terms of microstructure, hardness and monotonic and cyclic properties. Microstructural features in base metal and different zones in the weld region were discussed and the mechanical behavior of spot welds in tensile-shear configuration was studied. Effects of welding parameters were investigated on the micro-and macroscale characteristics of magnesium spot welds. To this end, five sets of spot weld specimens were prepared, utilizing different welding parameters. The effect of cyclic loading was studied on microstructure and hardness of the base metal and the weld region, and it was shown that microstructural features do not change remarkably under cyclic loading. Fatigue crack initiation and propagation behavior was discussed for different specimen sets under both low and high cyclic loads. Fatigue cracks under high cyclic loading initiated close to the nugget edge, and decreasing the cyclic load nucleated the cracks farther from the nugget.The final publication is available at Elsevier via http://dx.doi.org/10.1016/j.matdes.2011.06.001 © 2011 ABSTRACTResistance spot welds of a magnesium alloy were characterized in terms of microstructure, hardness and monotonic and cyclic properties. Microstructural features in base metal and different zones in the weld region were discussed and the mechanical behavior of spot welds in tensile-shear configuration was studied. Effects of welding parameters were investigated on the micro-and macro-scale characteristics of magnesium spot welds. To this end, five sets of spot weld specimens were prepared, utilizing different welding parameters. The effect of cyclic loading was studied on microstructure and hardness of the base metal and the weld region, and it was shown that microstructural features do not change remarkably under cyclic loading. Fatigue crack initiation and propagation behavior was discussed for different specimen sets under both low and high cyclic loads. Fatigue cracks under high cyclic loading initiated close to the nugget edge, and decreasing the cyclic load nucleated the cracks farther from the nugget.

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Effect of process parameters on the strength of resistance spot welds in 6082-T6 aluminium alloy

Cited by 89 publications

References 23 publications

Mechanical Properties Investigation of Multi-Lap Stainless Steel Sheets

Mechanical Properties Investigation of Multi-Lap Stainless Steel Sheets

Effect of Process Parameters on the Mechanical Properties and Failure Behavior of Spot Welded Low Carbon Steel

Characterization of magnesium spot welds under tensile and cyclic loadings

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