| dc.description.abstract | The need for thin foil welding is increasing significantly, particularly in the electronic
industries. The technologies that are currently available limit the joining processes in terms of
materials and their geometries. In this paper, a series of trials of fusion welding (bead-on- plate) of
commercially pure titanium (CPTi) foils were conducted using a blue diode laser (BDL) welding
method. The power used was 50 W and 100 W for 0.1 mm and 0.2 mm thick foils, respectively.
Following welding, various samples were prepared to examine the weld profiles, microstructures,
hardness, tensile strength, and fracture surface characteristics. The results showed that the base
metal (BM) had an annealed microstructure with equiaxed grains, while the weld zones contained
martensite (α’) with large grains. The hardness increased in both regions, from around 123 HV
to around 250 HV, in the heat-affected zone (HAZ) and fusion zone (FZ) areas. The tensile tests
revealed that the strengths of the welded samples were slightly lower than the unwelded samples,
i.e., UTS = 300–350 MPa compared with 325–390 MPa for the unwelded samples. Fracture took
place within the BM area. All of the samples, welded and unwelded, showed identical fracture
mechanisms, i.e., microvoid coalescence or ductile fracture. The weld zone experienced very small
strains (elongation) at fracture, which indicates a good weld quality. | en_US |
