1：Experimental Design and Method Selection:

Three patterns including dimple, groove and grid were laser textured on the 30CrMnSiA steel substrate by nanosecond fiber laser. The processed surface was characterized by surface morphology, surface roughness (Ra and Rz) and wettability. The single lap adhesive joints were fabricated and fracture surfaces were observed. The accelerated hygrothermal aging experiments were performed.

2：Sample Selection and Data Sources:

30CrMnSiA steel was used as the substrate material. The sheets were cut into 100 mm × 25 mm×2 mm.

3：List of Experimental Equipment and Materials:

Pulsed fiber laser (SP-070P-A-EP-Z-B-Y), super depth optical microscopy (OM, DSX510), field emission scanning electron microscope (FESEM, MERLIN Compact), contact angle measuring instrument (JGW-360B), universal material testing machine (Instron 5967), high-low temperature-humidity test chamber (GPL-2, ESPEC LIMITED, Shanghai, China).

4：Experimental Procedures and Operational Workflow:

The textured patterns were processed by pulsed fiber laser. The processed surface was characterized by surface morphology, surface roughness (Ra and Rz) and wettability. The single lap adhesive joints were fabricated and fracture surfaces were observed. The accelerated hygrothermal aging experiments were performed.

5：Data Analysis Methods:

The surface topography profile and roughness including Ra and Rz were evaluated by OM. The static contact angle was measured by the sessile drop method. The tensile shear strength was calculated by the ratio of the load (F) to the area of the adhesive bonded area (S).