Welding of copper with an infrared fiber laser is still a challenge for current state-of-the-art laser. The high reflectivity leads to irregularities at the beginning of the process and the low surface tension and viscosity of copper causes a high sensitivity for sputter ejections especially at low and mid welding speeds.  Unfortunately welding copper with near infrared wavelength can be challenging due to material properties in solid phase, such as the low absorption in a range of few percent and the relative high heat conductivity. These properties influence spatter ejections as well as random variation in penetration depth due to instable in-coupling of the laser power. To overcome these challenges different techniques have been used in our Special laser welding machine for Copper and other high reflective materials. 
Our Self-develloped Brilliant single mode laser sources provide extremely high power densities for a reliable coupling into high reflective materials and proper welding process. Our suplementary solution aside our high brightness laser source, to avoid sputter ejections is a perfectly  controlled oscillation of the laser beam, the so called wobbling. Wobbling leads to a high beam speed at a low feed rate resulting in a stable key hole and a strong reduction of sputter at low welding speeds. Thereby the wobbling gives the opportunity to change the shape of the weld seam in a wide range. And our anti porosity system reduce drastically the creation of porosity which initiates the sputter ejections. 
Industrial end-users as well as consumers demand for reliable and cost efficient weld seams in products. Thus formulate the expectation on a widely controllable weld seam behavior in terms of spatter free, homogeneous joint with low electrical resistance.