The material utilized is stainless steel, and the goal is to weld the connecting pin to the connecting component to produce a complete watch strap. The weld joint necessitates a significant depth of fusion to guarantee a secure bond, and no depression should exist after welding.

Post-polishing, the weld seam’s appearance must match the connecting piece without any evidence of welding marks, distortion, discoloration, or other defects. The laser welding machine utilized is WF300, coupled with W-PCTL2020 workbench, with a welding speed of 4mm/s. The FSI fiber is deployed, with a core diameter of 0.4mm, while the collimated focusing head is CF3612080AV.

Effect drawing after welding

Distinctive features of laser welding

In the typical laser welding of watch strap connecting pins, inserting the pins into the connecting pieces requires an elevation of roughly 0.2-0.5mm, depending on the pin’s thickness. The welding process is to focus the laser on the contact circumference between the connecting pin and the connecting piece. In this example, the pin’s diameter is 0.8mm, hence its circumference is C = 3.14 * 0.8 = 2.5mm. Consequently, the duration necessary for a singular weld is S = 2.5 / 4 = 0.63s.