Evaluation of cold metal transfer (CMT) process for welding aluminium alloy

Pickin, C. G.; Young, Ken

doi:10.1179/174329306x120886

Cited by 227 publications

(85 citation statements)

References 3 publications

(3 reference statements)

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“…Therefore, CMT process not only has the GMAW characteristics of low cost and high efficiency, but also reduces heat input effectively. Basic operating principles of CMT process were previously reported by Pickin and Young [15] through comparing the process stability between conventional arc welding and CMT process for welding thin aluminum alloy sheets. And this work has been expanded by Feng et al [16] for welding aluminum sheets.…”

Section: Introductionmentioning

confidence: 99%

Investigation of droplet transfer behaviours in cold metal transfer (CMT) process on welding Ti-6Al-4V alloy

Sun¹,

Lv²,

Xu³

et al. 2015

Int J Adv Manuf Technol

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Ti-6Al-4V alloy is widely used in the aeroengine industry due to its excellent comprehensive mechanical properties. In this paper, the droplet transfer behaviours of cold metal transfer (CMT) welding Ti-6Al-4V alloy have been studied by analysing captured electrical waveforms and high-speed images of droplet transfer process. The results indicated that the current and voltage waveforms of CMT welding Ti-6Al-4V alloy are different from that of typical CMT cycle. A current pulse appears in short-circuit phase to adjust energy distributions of different stages, and it results in smoother droplet transfer process. Frequency of droplet transfer increases with augment of wire feed rate or decrease of inductance correction value. Droplet size is greater with high wire feed rate or small inductance correction value.

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Section: Introductionmentioning

confidence: 99%

Investigation of droplet transfer behaviours in cold metal transfer (CMT) process on welding Ti-6Al-4V alloy

Sun¹,

Lv²,

Xu³

et al. 2015

Int J Adv Manuf Technol

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“…Il aété développé spécifiquement pour le soudage des alliages d'aluminium [3]. CMT est l'acronyme de « Cold Metal Transfer ».…”

Section: Introductionunclassified

Soudage homogène MIG de l'alliage d'aluminium 6061

Benoit

Paillard

Baudin

et al. 2013

MATEC Web of Conferences

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Abstract. The homogeneous welding (same filler metal as base metal) of the 6061 aluminium alloy with MIG process has never been reported in the open access literature. This work shows that the CMT (Cold Metal Transfer) MIG, a derivative of MIG, allows producing welds without hot-cracking. Moreover, further heat treatments partially increased or fully restore the mechanical properties of the weld. These results are compared with 6061 heterogeneous welds usually met in the industry.Résumé. Le soudage homogène (métal d'apport identique au métal de base) de l'alliage d'aluminium 6061 avec un procédé dit semi-automatique (MIG) n'a jamaisété reporté jusqu'à maintenant dans la littérature. Nous montrons ici que l'utilisation d'un dérivé du procédé de soudage MIG, le MIG CMT (Cold Metal Transfer) permet d'obtenir des cordons de soudures sains (sans fissurationà chaud). De plus des traitements thermiques ont permis de retrouver partiellement ou de restaurer totalement les propriétés de la soudure. Nos résultats sont comparésà des essais de soudage MIG CMT avec le métal d'apport préconisé pour le soudage de l'alliage 6061.

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“…[10,11,33,34] The IM layer which forms between the aluminum weld and the steel sheet ensures dissimilar bonding, but limiting its thickness is mandatory for obtaining ductile joints for both static and dynamic applications. [20,21] Among the Al x Fe y phases listed in the binary Al-Fe phase diagram, [35] two main phases were identified in laboratory experiments to form at the interface between solid iron or steel and liquid aluminum or its alloys: Al 5 Fe 2 as the major g-phase [36][37][38] together with Al 3 Fe (also referred to as Al 13 Fe 4 ) as the minor h-phase. [39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55] Both [17][18][19]21,24,27,29] or at least either one [22,23] of these two phases were also found to form during dissimilar CMT welding of aluminum alloys with steel.…”

Section: Introductionmentioning

confidence: 99%

“…[9][10][11] An opportunity for joining particularly thin metal sheets by combining the advantages of both fusion and solid-state welding offers the Cold Metal Transfer (CMT) process developed by Fronius. [12] The CMT process enables spatter-free joining of similar metals, e.g., Al-Al bead-on-plate [13][14][15] or butt welding, [16] as well as joining of dissimilar metals, e.g., Al-steel butt welding with tapered steel sheet edges, [17][18][19] overlap welding, [20][21][22][23][24][25][26][27][28][29] or even spot welding. [30][31][32] In comparison with conventional gas metal arc (GMA) welding processes, the heat input of the CMT process is significantly reduced.…”

Section: Introductionmentioning

confidence: 99%

Influence of Filler Alloy Composition and Process Parameters on the Intermetallic Layer Thickness in Single-Sided Cold Metal Transfer Welding of Aluminum-Steel Blanks

Silvayeh

Vallant

Sommitsch

et al. 2017

Metall Mater Trans A

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Hybrid components made of aluminum alloys and high-strength steels are typically used in automotive lightweight applications. Dissimilar joining of these materials is quite challenging; however, it is mandatory in order to produce multimaterial car body structures. Since especially welding of tailored blanks is of utmost interest, single-sided Cold Metal Transfer butt welding of thin sheets of aluminum alloy EN AW 6014 T4 and galvanized dual-phase steel HCT 450 X + ZE 75/75 was experimentally investigated in this study. The influence of different filler alloy compositions and welding process parameters on the thickness of the intermetallic layer, which forms between the weld seam and the steel sheet, was studied. The microstructures of the weld seam and of the intermetallic layer were characterized using conventional optical light microscopy and scanning electron microscopy. The results reveal that increasing the heat input and decreasing the cooling intensity tend to increase the layer thickness. The silicon content of the filler alloy has the strongest influence on the thickness of the intermetallic layer, whereas the magnesium and scandium contents of the filler alloy influence the cracking tendency. The layer thickness is not uniform and shows spatial variations along the bonding interface. The thinnest intermetallic layer (mean thickness < 4 lm) is obtained using the silicon-rich filler Al-3Si-1Mn, but the layer is more than twice as thick when different low-silicon fillers are used.

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Evaluation of cold metal transfer (CMT) process for welding aluminium alloy

Cited by 227 publications

References 3 publications

Investigation of droplet transfer behaviours in cold metal transfer (CMT) process on welding Ti-6Al-4V alloy

Investigation of droplet transfer behaviours in cold metal transfer (CMT) process on welding Ti-6Al-4V alloy

Soudage homogène MIG de l'alliage d'aluminium 6061

Influence of Filler Alloy Composition and Process Parameters on the Intermetallic Layer Thickness in Single-Sided Cold Metal Transfer Welding of Aluminum-Steel Blanks

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