Galvanised steel to aluminium joining by laser and GTAW processes

Sierra, Guillaume; Peyre, P.; Deschaux-Beaume, Frédéric; Stuart, David; Fras, Gilles

doi:10.1016/j.matchar.2008.03.016

Cited by 121 publications

(73 citation statements)

References 20 publications

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“…Moreover, the nearly zero solid solubility of iron in aluminum alloy is readily to promote the formation of intermetallic compounds. 6) Several solid state welding methods have been investigated to join steel and aluminum alloy, including explosion welding, 7,8) ultrasonic welding, 9) magnetic pressure welding, 10,11) friction welding [12][13][14] and friction stir welding. 15,16) The solid state welding techniques are expected to restrain the growth of the intermetallic compound layer within a permissible limit, which has been identified as 10 μm thickness, 17) but the adaptability of these methods is restricted in automotive industry due to equipment configuration.…”

Section: Introductionmentioning

confidence: 99%

“…15,16) The solid state welding techniques are expected to restrain the growth of the intermetallic compound layer within a permissible limit, which has been identified as 10 μm thickness, 17) but the adaptability of these methods is restricted in automotive industry due to equipment configuration. In the last few years, arc welding-brazing, [18][19][20][21] laser reactive wetting 6) and laser brazing 4,5,[22][23][24][25] of the dissimilar materials of steel and aluminum alloy have drawn great attentions. Lin et al [18][19][20] studied dissimilar metals TIG welding-brazing of aluminum alloy to stainless steel using Al-Si, Al-Cu and Al-Si-Cu filler wires.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Intermetallic Compounds in Dissimilar Material Resistance Spot Welded Joint of High Strength Steel and Aluminum Alloy

et al. 2011

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Dissimilar materials of H220 Zn-coated high strength steel and 6008 aluminum alloy were welded by median frequency resistance spot welding. Interfacial characteristics and kinetics of growth of intermetallic compound layer at steel/aluminum interface in the welded joint were investigated. The intermetallic compound layer was mainly made up of η-Fe2Al5 and θ-FeAl3 phases, and its morphology and thickness varied with positions along the interface. The growth behavior of the intermetallic compound layer was dominated by η-Fe2Al5, which exhibited parabolic characteristic. The growth coefficient of η-Fe2Al5 could be expressed as with k0 of 132 m 2 /s and Q of 239 kJ/mol. The kinetics of growth of the intermetallic compound layer indicated that its formation and growth were mainly driven by reactive diffusion between Fe and Al atoms, and hence the thickness and morphology of the layer were dependant on interaction time between liquid aluminum alloy and solid steel, and also interfacial temperature history during welding. The brittle intermetallic compound layer at the steel/aluminum interface was the weak zone where cracks inclined to derive and propagate during tensile shear testing. The fracture surfaces of the welded joint displayed mixed fracture morphology with both brittle and ductile features.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization of Intermetallic Compounds in Dissimilar Material Resistance Spot Welded Joint of High Strength Steel and Aluminum Alloy

et al. 2011

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“…The fretting stress field thus created may be sufficient for certain applications. [4] However, for a perfect tightness and an optimum load transfer with good thermal and electrical conductivities, a sound metallurgical bond of the same type as that which can be found in assemblies produced by laser or arc welding [5] has to be formed at the insert/alloy interface. This is achieved by using specific insert moulding techniques such as ultrasonic vibration assisted casting, [6] expendable pattern casting [7] or the ''Alfin'' process [8] still employed today to bond nickel austenitic cast iron ring carriers to pistons.…”

Section: Introductionmentioning

confidence: 99%

Chemical Changes at the Interface Between Low Carbon Steel and an Al-Si Alloy During Solution Heat Treatment

Zhe

Dezellus

Gardiola

et al. 2011

J. Phase Equilib. Diffus.

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The aim of this work was to characterize the chemical changes during solid state solution heat treatment of a metallurgically bonded steel/Al-Si interface. For this purpose, low carbon steel plates covered with the A-S7G03 aluminium alloy (7 wt.% Si, 0.3 wt.% Mg analogous to A356) were prepared by dip coating, water-quenching to room temperature and reheating in the solid state at 480-560°C for 3-160 h. Upon reheating at 535°C, a reaction layer was observed to grow at the interface between steel and the iron-saturated Al-Si alloy. As long as an intimate contact could be maintained, the total thickness, x, of the reaction layer increased with time, t, according to a nearly parabolic growth law x 2 = KAEt 2 b. At 535°C, the value of the growth constant was K = 4.045310 214 m 2 s 21 . This constant was found to be thermally activated [K = K 0 exp(2Q/ RT)] with K 0 = 4.37310 24 m 2 s 21 and Q = 153 kJ mol 21 . The whole chemical interaction process was controlled by solid state volume diffusion and the reaction layer sequence corresponded to a diffusion path in the Al-Fe-Si phase diagram. A striking feature of the reaction process is the unbalanced diffusion of aluminium atoms through the reaction zone which rapidly results in the formation of Kirkendall voids. As these voids coalesce, solid state diffusion becomes more and more difficult and the steel/alloy bond gets weakened. Oxidation appears to be an aggravating factor, where applicable.

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“…al. [16], which no non-uniform chemical distribution zone was found. The different of our research work and G. Sierra, et., al. work was type of base metal lying on top of lap joint.…”

Section: Discussionmentioning

confidence: 84%

“…al. [16] used laser beam welding and gas tungsten arc welding (GTAW) to weld galvanized steel to aluminum alloy by applying self-brazing technique. In their work on GTAW, they applied lap joint configuration with aluminum alloy lying on the top and arc was given to steel surface from the bottom.…”

Section: Introductionmentioning

confidence: 99%

GTAW of Zinc-Coated Steel and Aluminum Alloy

Borrisutthekul¹,

Seangsai²,

Paonil³

2018

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Abstract. In this study, effect of zinc-coated layer on steel sheet of dissimilar metals welding between SCGA270C steel and A5052 aluminum alloy by GTAW was investigated. In the experiments, two types of self-brazing welding; 1) welding between non-zinc-coated steel/aluminum alloy, and 2) welding between zinc-coated steel/aluminum alloy, were carried out. The lap joint configuration in which steel was lying on top of aluminum alloy was applied. From the results of zinc-coated steel case, the reaction between the lowmelting-point zinc with both molten and solid aluminum alloy provided larger welding width between two metal sheets. Moreover, zinc, which is heavier than aluminum alloy, was fallen down but not well mixed into molten aluminum alloy. Consequently, thick intermetallic compound layer near welding interface between steel/aluminum alloy was formed. Comparison of load resistance between non zinc-coated case and zinc-coated steel case, the wider welding width which consequently improvement the load resistance of the welds was obtained, when using low heat input. However, when applying higher, significant contraction of aluminum welding pool promoted crack along the non-uniform chemical composition zone in case of zinc-coated steel. These cracks were the cause of reduction of load resistance of the welds between zinc-coated steel/aluminum alloy.

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Galvanised steel to aluminium joining by laser and GTAW processes

Cited by 121 publications

References 20 publications

Characterization of Intermetallic Compounds in Dissimilar Material Resistance Spot Welded Joint of High Strength Steel and Aluminum Alloy

Characterization of Intermetallic Compounds in Dissimilar Material Resistance Spot Welded Joint of High Strength Steel and Aluminum Alloy

Chemical Changes at the Interface Between Low Carbon Steel and an Al-Si Alloy During Solution Heat Treatment

GTAW of Zinc-Coated Steel and Aluminum Alloy

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