The relation between microstructure and corrosion behavior of GTA welded AZ31B magnesium sheet

Study of the corrosion behavior of magnesium alloy weldings in NaCl solutions by gravimetric tests

“…1a and b) and the presence of small precipitated particles is clearly visible. As mentioned in the previous chapter, according to other authors (Ben-Hamu et al, 2007) β-phase is not stable at room temperature, the presence of Mg 17 Al 12 precipitated particles may be explained as follows: in the case of "as fabricated" material is very likely that β-phase precipitated particles are metastable compounds produced during the cooling of the hot rolling process, the same result could explain its presence in the melted material The fast cooling rates during welding processes would help to produce metastable structures, this hypothesis is also supported by the small amount of dispersed particles present in the heat-affected zone. It can be argued that β-phase particles present in the as fabricated base material are dissolved during the thermal cycle of the welding, so that the presence the β-phase metastable in the AZ31 alloy specimens has two explanations, the small dispersed particles present in the α-matrix are produced during the hot-rolling process and there are larger particles in the welded zones due to the freezing.…”

“…GTAW is a welding system which allows to obtain high quality weld joints while minimizing spots, arc instability, porosity and the lack of penetration that may happen in the case of other arc welding techniques such as Shielded Metal Arc Welding (SMAW) or laser (Ben-Hamu et al, 2007).…”

Laser Welding of Thin Sheet Magnesium Alloys

“…However, the laser welding of thin sheet metals can still be problematic. Issues include the loss of material due to evaporation and inadequate control of heat, which leads to cutting and melt-through issues (Aghios, Bronfiu et al 2001;Cao, Jahazi et al 2006;G. Ben-Hamu 2007).…”

“…Ben-Hamu 2007). There are plenty of reports on the welding of copper, stainless steel and aluminum alloys (Aghios, Bronfiu et al 2001;Cao, Jahazi et al 2006;G. Ben-Hamu 2007) in thin sheets of less than 1 mm thickness, but few studies have been published to date that focus on thin sheets of similar thickness in the case of magnesium alloys.…”

Surface modification of the AZ91 magnesium alloy

“…The availability of welding equipment, noteworthy price competitiveness, equipment mobility and the simplicity in work fulfilment, all this speaks in favour of the GTAW method [20,21]. Equally important are also: short processing time, flexibility operation, economy in time, energy and material consumption and processing precision, which are signalized in Ref.…”