Taguchi Optimization of Pulsed Current GTA Welding Parameters for Improved Corrosion Resistance of 5083 Aluminum Welds

Rastkerdar, Ebad; Shamanian, M.; Saatchi, A.

doi:10.1007/s11665-012-0346-5

Cited by 24 publications

(13 citation statements)

References 33 publications

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“…In general, the difference in solidified grain structure is due to solidification velocity. Since the P‐GTAW process has slower melt convection, the coarser grains are growing steadily due to the slower development of solidification interfaces in welds . Figure a shows the FZ microstructure of weld 1 processed with 130 A I p and 40% T p .…”

Section: Resultsmentioning

confidence: 99%

“…The weldments produced with shorter T p showed a lower corrosion potential ( E corr ) than those made with longer T p . Rastkerdar et al said that the changing of welding parameter changes the E corr , without affecting the pitting nucleation potential ( E pit ) significantly. The difference in E corr could be the result of the changes occurred in morphology and surface distribution of anodic and cathodic intermetallic particles whereas E pit only affected the crystallographic pitting behavior .…”

Section: Resultsmentioning

confidence: 99%

“…Hence, a mean welding current ( I m ) is used to calculate the heat input instead of welding current ( I ). The mean current and heat input was calculated using the following equations and the arc efficiency was taken as 70%

M e a n c u r r e n t I_{m} = true[(I_{p} T_{p} + I_{b} T_{b}) / true(T_{p} + T_{b} true) true] a m p s

H e a t i n p u t H I = true[(I_{m} \times V) / S true] \times η J {mm}^{- 1}

where I p , Peak current, amps; I b , Base current, amps; T p , Peak current pulse duration, %; T b , Base current pulse duration, %; V , Voltage, V; S , Welding speed, mm s –1 ; and η , Arc efficiency, %.…”

Section: Methodsmentioning

confidence: 99%

“…All the electrodes were immersed in an aqueous solution containing 3.5% NaCl which has the pH range of 7–8, which is similar to seawater. The experiment was conducted from –1 V/SCE to +1 V/SCE at the scan rate of 1 mv s –1 . The elemental and microstructural features of weldments before and after corrosion were studied under scanning electron microscope (SEM) equipped with an energy dispersive spectrometry (EDS) and also the weldments before corrosion were characterized using X‐ray diffraction (XRD) technique to reveal the presence of intermetallic particles.…”

Section: Methodsmentioning

confidence: 99%

“…However, the corrosion properties of weldments mainly depend on the precipitation of β ‐phase (Al 3 Mg 2 ) and other intermetallic particles. So the microstructural changes occurred during welding causes more anodic reactions and induces the formation of pits . The fusion welding processes can instigate β ‐phase precipitation and grow it in size along the grain boundaries whereas in solid‐state welding processes the dispersion and partial dissolution of anodic β ‐phase particles could result in improved corrosion resistance .…”

Section: Introductionmentioning

confidence: 99%

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Effect of Pulse Duration on Corrosion and Impression Creep Properties of AA5083‐H111 Al–Mg Alloy Weldments Processed by P‐GTAW

Umar

Sathiya

2018

Adv Eng Mater

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In this work, the corrosion and impression creep properties of weldments are determined using potentiodynamic polarization test and impression creep test. It is evident that the shorter pulse duration results in comparatively finer grains and reduces the loss of magnesium in fusion zone, which facilitates an increase in precipitation of anodic β-phase (Al 3 Mg 2 ) and Mg 2 Si particles in the grain boundaries. It leads to the formation of pits by dissolving Mg atoms and propagate along the interdendritic region and finally corrode the surface thoroughly. On contrary, the increase in pulse duration results in uniform distribution of iron-rich Al 6 (Fe,Mn) intermetallics as well as Fe and Mn particles in the interdendritic region which induce localized cathodic reaction and these localized cathodes assisted in achieving noble corrosion resistance by increasing the width of passive region. Also, an increase in creep resistance is attained with an increase in activation energy at a temperature of 573 K owing to the uniform dispersion of iron-rich Al 6 (Fe, Mn) intermetallics in the grain boundaries of weldments processed with longer pulse duration. Hence, it is inferred from this research that the rise in pulse duration improves the corrosion and creep resistance of weldments by altering the morphology and surface distribution of intermetallics.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%