Fig.1

Schematic diagram of the laser surface treatment process"

Table 1

Laser parameters for the selected engraving machine"

Fig.2

Schematic and physical diagrams of the fixture of shear mechanical properties for bonding joints"

Fig.3

Schematic representation of the interfacial contact angle model"

Table 2

Experimentally used laser energy density and its power parameters"

Fig.4

XPS spectra of the interface between the base material （a）~（c） and the laser-treated （d）~（f） interface"

Fig.5

Surface morphology of laser processing with different laser energy densities"

Fig.6

White light interference surface profiler"

Fig.7

Three-dimensional profiles of surfaces processed with different laser energy densities"

Fig.8

Effect of laser energy density on the infiltration and shear strength of the bonding joints"

Fig.9

Effect of laser energy density on the surface morphology of the bonding joint and a schematic diagram of the bonding interface with different groove depths"

Fig.10

Shear macroscopic fracture morphology of bonding joints in different energy densities"

Fig.11

Schematic diagrams of typical laser-treated surface groove processing paths"

Fig.12

Surface morphology of different laser groove shapes processed"

Fig.13

Surface profiles machined with different laser groove shapes"

Fig.14

Wettability of surfaces of five groove shapes and shear strength of bonding joints"

Fig.15

Morphology of surface droplets with five types of groove"

Fig.16

Force analysis of bonding joints under shear loads"

Fig.17

Shear fracture morphology for five surface shapes"

Fig.18

Surface morphology of bonded joints at four laser overlap rates"

Fig.19

Surface profiles of the bonding joints for four laser overlap rates"

Fig.20

Wettability and shear strength of the bonding joints at different overlap rates"

Fig.21

Fracture morphology of the bonding joints with four overlap rates"