A LOOK AT THESE WELDING METHODS
YAG vs. Fiber Laser Welding
YAG and fiber laser welding are valuable welding methods for precision joining, but they do have some important distinctions that are key when weighing the right method for injection mold repair and maintenance. These differences run the gamut from cost to efficiency to performance, so a clear understanding of these two weld methods is key in selecting the right one for a given project.
What is YAG welding?
Nd:YAG (neodymium-doped yttrium aluminum garnet) lasers use a solid crystal rod as the gain medium. These are typically pumped by flash lamps to generate a beam around 1064 nm. This design produces a high level of pulse power but relatively low electrical efficiency and significant heat in the crystal.
Nd:YAG lasers typically have poorer beam quality, especially as power increases, because thermal gradients in the crystal degrade. This often means slower travel speeds and a broader heat‑affected zone, and this level of heat can cause stress and distortion to the workpiece.
It’s also important to note that YAG lasers are far less efficient, often around 2 to 3% conversion efficiency. This wastes most of the input power as heat, which demands more robust cooling and more frequent lamp replacement. This also leads to increased energy consumption, more downtime, and higher maintenance costs.
What is fiber laser welding?
Fiber laser welding uses a long optical fiber as the gain medium. This fiber is pumped by diodes, which guides the beam more efficiently and maintain excellent beam quality even at higher powers. Fiber laser welders can also operate around 080 nm but with far higher electrical-to-optical conversion efficiency and more stable outputs.
Fiber lasers maintain a low beam parameter, often enabling spot sizes near 0.1 mm while keeping power density high — this supports faster and deeper welds. Fiber lasers typically achieve electrical-to-optical efficiencies of around 30%, which reduces power consumption, cooling load, and operating costs over the life of the machine
