Effect of Nd:YAG laser welding on microstructure and hardness of an Al–Li based alloy

Microstructure and mechanical properties of newly developed aluminum–lithium alloy 2A97 welded by fiber laser

“…Orientation imaging microscopy has proved that the grains in EQZ have random orientation [7,23,31], therefore, for the laser welded 2A97 Al-Li alloy, non-epitaxial growth has occurred. Two hypotheses, HAZ/PMZ recrystallization mechanism [32] and solidification mechanism with both nucleation and growth [33][34][35][36], have been proposed to explain the formation of EQZ.…”

“…Therefore, to extend the range of application for Al-Li alloys and obtain further overall performance, it is imperative to use the welded structure and develop suitable welding methods. However, conventional arc welding of Al-Li alloys faces many problems, including the presence of porosities and hot cracking, loss of elements, and serious mechanical properties degradation, making the welded Al-Li structure not meet the requirement of performance [6][7][8].…”

“…Although laser beam welding of Al-Li alloy has been documented by a number of papers, most of them have been limited to certain types including 8090, 1420, 2090, etc. [6,7,[9][10][11][12], and up to now, many researches on 2A97 Al-Li alloy are primarily focused on the effects of heat treatments on the microstructure and mechanical properties [13,14]. Some information is available regarding friction stir welding of 2A97 [15,16], however, there are few reports published in the open literature on laser beam welding of 2A97 Al-Li alloy.…”

A Weldability Study of Al–Cu–Li 2198 Alloy

“…As is well known, Al-Li-Cu alloys such as A2198 exhibit high strength levels due to the precipitation state achieved through a relatively complex precipitation sequence, which can involve solute clusters, GP zones, and θ′, T1, and δ′ phases [20,21]. After welding, these structures undergo an evolution with the possible decrease of mechanical properties in the HAZ (i.e., due to the precipitation of the T1 phase at the grain boundaries).…”

Effect of porosities on tensile properties of laser-welded Al-Li alloy: an experimental and modelling study

“…Although there is a huge potential for LBW to be used in Al-Li alloys [16,17], the technique is not well understood currently. The welding parameters, keyhole dynamics, vapour and plasma characteristics, welding defects prevention and mechanical properties of the welded Al-Li alloy joints have been studied and reported in [18][19][20].…”