In the past, the surfacing welding repair of molds generally used W-inert gas-shielded arc welding (referred to as TIG welding). However, in recent years, due to the advent of pulsed laser surfacing welding machines, more subtle and precise mold repairs have become possible. In Japan, laser surfacing welding machines were originally used for jewelry processing due to their precision operability. But now it has been widely used in the repair of plastic, die-casting, stamping and other molds. Since it can repair and repair the mold parts, wear parts, defects and pinholes with an accuracy of 0.01mm, it is an effective repairing method, and its market is expanding and demand is high, so that both mold manufacturers and entrusted processors can This technology and equipment have been introduced.
The laser pulse width, the number of frequencies, and the beam diameter (focus diameter) are adjusted in consideration of the material and shape of the weld overlay, so that optimum welding conditions can be set during welding. Since the microscope focus and the laser focus distance are continuously adjusted, it is easy to set the conditions. First, in order to prevent poor fusion of the repaired portion, only the laser is applied to the surfacing portion without using the wire. Then, the tip of the wire is inserted, and a small amount of fusion is performed for surfacing; then normal surfacing is performed until a poorly welded weld layer such as a pinhole is formed.
With the repair and modification of molds such as plastic molding, die-casting, and stamping, in addition to modification and correction, there are welding defects for mechanical parts and precision parts, and poor welding such as TIG (such as secondary undercuts, pinholes, etc.) Repair, as well as surfacing welding between various metals.