Trintfar fiber laser welding machine is a handheld device which adopts a high-quality fiber laser source to produce a fiber optic beam. After transmission processing, the light is focused on the workpiece to achieve continuous welding. The handheld fiber laser welding machine is more flexible and replaces the fixed light path in previous welding machines. The flexibility of the handheld equipment facilitates the welding of molds, advertising characters, kitchen utensils, doors and windows, etc but also makes laser welding possible in outdoor operations. Because the handheld fiber laser welding machine is so versatile it replaces traditional welding of electric welding, argon arc welding, etc. The handheld welding machine avoids the two thresholds of thermal strain and post-treatment, is environmentally friendly and pollution-free. The welding results are of high quality with no deformation or scar of the work piece.