Spot welding effect is achieved by focusing the laser beam into a small spot, typically a few millimeters in diameter. This concentrated heat source creates a localized melt pool that fuses the metal parts together.

The YAG laser is a solid-state laser that produces a high-intensity beam of light with a wavelength of 1064 nanometers. This wavelength is particularly effective at welding gold and silver materials because it is absorbed well by these metals.