Laser welding together has its advantages: high energy density, high welding speed, high welding quality (aspect ratio can reach 2 - 2), weld fine microstructure and high strength; 2. small heat affected zone and welding deformation data; end simple automation, can advance productivity; welding is difficult to close position, the implementation of long-distance welding; numerical control operations and collaboration, welding end surfaces and thin messy shaped pipe; any pollution and corrosion; also can be used for laser welding of dissimilar metals between different types.
The definition of laser scanning welding: a scanning head device in sixth axis robot, at the end of the laser from the laser source of the cable that is directly connected to the scanning head, in a scanning head two to three adjustable lens can be reflected laser light onto the workpiece. When the lens is shaken, the laser beam runs from one point to another, and the welding is carried out. For robot arm, it is not necessary to use the scanning head to precisely locate each spot. The distance between the laser scanning head and the workpiece surface can exceed 500mm, and when the focal diameter is 0.6mm, the processing area is about 190mm * 320mm elliptic region.
This is also the most likely to be used for the operating distance and operating range of the system. Because the manipulator has a repositioning action greater than 90 degrees in the welding process, if the distance is too large, it will lead to unnecessary waste of time in the relocation process. If the operation distance is reduced, it also means that the small operation area, the continuity of welding process and the utilization rate of laser will be greatly restrained. Another advantage of large operating distance is the extension of the lens glass using his maintenance, improve maintenance after the air curtain, using his glass is greatly extended, can be used for welding over 15000 pieces.