Effects of surface conditions on resistance spot welding of Mg alloy AZ31

Liu, L.; Zhou, Sq Q.; Tian, YH; Feng, Jia; Jung, Jae Pil; Zhou, Y.

doi:10.1179/136217108x394726

Cited by 36 publications

(21 citation statements)

References 23 publications

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“…Furthermore, the surfaces of the plates were chemically cleaned, using a solution of 2.5 g chromic oxide and 100 mL distilled water before welding, as suggested by previous work. [26] Welding was performed by the conventional RSW technique using a S-400 Robotron 600V single-phase AC spot welding machine (Centreline (Windsor) Ltd., Windsor, ON, Canada). The welding conditions are listed in Table II.…”

Section: Methodsmentioning

confidence: 99%

Resistance-Spot-Welded AZ31 Magnesium Alloys: Part I. Dependence of Fusion Zone Microstructures on Second-Phase Particles

Xiao

Liu

Zhou

et al. 2010

Metall Mater Trans A

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A comparison of microstructural features in resistance spot welds of two AZ31 magnesium (Mg) alloys, AZ31-SA (from supplier A) and AZ31-SB (from supplier B), with the same sheet thickness and welding conditions, was performed via optical microscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD), and transmission electron microscopy (TEM). These alloys have similar chemical composition but different sizes of second-phase particles due to manufacturing process differences. Both columnar and equiaxed dendritic structures were observed in the weld fusion zones of these AZ31 SA and SB alloys. However, columnar dendritic grains were well developed and the width of the columnar dendritic zone (CDZ) was much larger in the SB alloy. In contrast, columnar grains were restricted within narrow strip regions, and equiaxed grains were promoted in the SA alloy. Microstructural examination showed that the as-received Mg alloys contained two sizes of Al 8 Mn 5 second-phase particles. Submicron Al 8 Mn 5 particles of 0.09 to 0.4 lm in length occured in both SA and SB alloys; however, larger Al 8 Mn 5 particles of 4 to 10 lm in length were observed only in the SA alloy. The welding process did not have a great effect on the populations of Al 8 Mn 5 particles in these AZ31 welds. The earlier columnar-equiaxed transition (CET) is believed to be related to the pre-existence of the coarse Al 8 Mn 5 intermetallic phases in the SA alloy as an inoculant of a-Mg heterogeneous nucleation. This was revealed by the presence of Al 8 Mn 5 particles at the origin of some equiaxed dendrites. Finally, the columnar grains of the SB alloy, which did not contain coarse secondphase particles, were efficiently restrained and equiaxed grains were found to be promoted by adding 10 lm-long Mn particles into the fusion zone during resistance spot welding (RSW).

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Section: Methodsmentioning

confidence: 99%

Resistance-Spot-Welded AZ31 Magnesium Alloys: Part I. Dependence of Fusion Zone Microstructures on Second-Phase Particles

Xiao

Liu

Zhou

et al. 2010

Metall Mater Trans A

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“…Investigations of Mg-to-Mg RSW similar joints deal with different aspects of weld characterization, e.g., effect of surface condition on RSW strength [8], effect of welding conditions on microstructure and static strength of spot-welds [9,10], and nugget growth simulation [11]. Work on magnesium RSW dissimilar joints have mainly focused on Mg-to-steel and Mg-to-aluminum, as they are the dominant metals in automobile body fabrication [12,13].…”

Section: Introductionmentioning

confidence: 99%

Fatigue characterization and modeling of AZ31B magnesium alloy spot-welds

Behravesh

Jahed

Lambert

2014

International Journal of Fatigue

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Cyclic behavior of AZ31B spot-welds was studied using different specimen configurations, and compared with steel and aluminum spot-welds. Fatigue strength of magnesium spot-welds was similar to aluminum and less than steel. Three failure modes were observed in tensile-shear specimens and one mode of failure in cross-tension specimens. Fatigue crack initiation life was 50% and 30% of the total life for tensile-shear and cross-tension specimens, respectively. A number of available fatigue models were assessed by predicting fatigue life of magnesium spot-welds. Although these models do not account for the asymmetric cyclic hardening behavior, some of them performed successfully for magnesium spotwelds.

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“…As a result, the oxides or oils were damaged and extruded out of welding zone, thus, a bond formed between the fresh surfaces under the friction and pressure. Generally speaking, surface characteristics, including surface finish, oxides, coatings, and contaminants on a base metal, are of significant importance to welding or brazing process [20,21]. However, it is not easy to quantitatively study the effects of the surface characteristics during ultrasonic welding.…”

Section: Microstructure Characteristics and Their Effects On The Strementioning

confidence: 99%

Microstructure and Mechanical Properties of Ultrasonic Welded Joint of 1060 Aluminum Alloy and T2 Pure Copper

Liu

Yan-shu

et al. 2017

Metals

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Abstract:The microstructure and mechanical properties of Al/Cu ultrasonic welding joints were investigated. Results show that: (i) the joint strength increased when the welding time increased within a certain range, and a maximal resistant force of 163.04 N was obtained when the welding duration and welding static pressure were 200 ms and 7.2 MPa, respectively; (ii) with a further increase of welding time, the bonding interface was gradually occupied by a thick strip layer of brittle Al 2 Cu (θ 2 ) phase, thus decreasing the strength; (iii) the maximum temperature in the welding region was 360 • C during the welding process, and a recrystallization phenomenon was identified near the welding interface; (iv) the average nanohardness of Cu, the Cu-Al interfacial reaction layer and Al were 1.04 GPa, 1.34 GPa, and 0.53 GPa, respectively, which is consistent with the formation of the intermetallic compound identified by energy-dispersive X-ray spectroscopy (EDS) and XRD analysis.

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Effects of surface conditions on resistance spot welding of Mg alloy AZ31

Cited by 36 publications

References 23 publications

Resistance-Spot-Welded AZ31 Magnesium Alloys: Part I. Dependence of Fusion Zone Microstructures on Second-Phase Particles

Resistance-Spot-Welded AZ31 Magnesium Alloys: Part I. Dependence of Fusion Zone Microstructures on Second-Phase Particles

Fatigue characterization and modeling of AZ31B magnesium alloy spot-welds

Microstructure and Mechanical Properties of Ultrasonic Welded Joint of 1060 Aluminum Alloy and T2 Pure Copper

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