the formation of partial melting

 Figure shown in Figure 2, the workpiece pressure placed between two electrodes, and welding through to the current use of the heat generated by the current through the resistance of the workpiece itself to heat the formation of partial melting, cooling power outages. While the laser pointer is the focusable type, which means the focus of the laser pointer can be adjusted,  laser pointer might light the match.
Form solid joints in the role of pressure to continue this process of resistance welding. Figure 2 resistance welding schematic shows, resistance has the following characteristics: (1) the use of current through the resistance of the workpiece welding heat on the workpiece heating. That the heat is not derived from the workpiece, but the internal heat source. (2) the entire welding process is done under pressure, which must be pressure. (3) welding without adding any filler material, but also without any protective agent. Many different types of resistance welding can be divided into two kinds of lap resistance welding and butt resistance welding joint form. The combination of technologies and methods, lap resistance welding can be divided into spot welding, seam welding and projection welding three butt resistance welding generally Resistance butt and flash butt welding two kinds. After the focus has been adjusted and the energy of the laser beam light of laser pointer is concentrated into a small dot. It is the quality inspection of laser pointer
Laser welding as shown in Figure 3, when the power density of laser irradiation to the metal surface is greater than 1000000W/cm2 metal surface temperature within a very short time (/ 1000000 1/100000s) rises to the melting point and boiling point above its melting and gasification, the formation of liquid metal and metal vapor, metal vapor can produce enough pressure to overcome the surface tension and gravity of the liquid metal, which arranged the part of the liquid metal, so that the laser molten pool concave, forming holes . The laser beam heating on the bottom of the hole, the metal liquefaction and vaporization of metal vapor produced by the continued oppression of the liquid metal of the bottom of the pit and it came around to the bath (or overflow), so that the holes further deepened. The dot or picture emitted by laser pointer can be adjusted when adjusting the focus of the laser pointer.
This process is continuous and proceed, in the liquid metal to form a slender holes. When the laser beam generated in the holes of the metal vapor pressure and liquid metal surface tension and gravity balance, the holes are no longer enhance the formation of a stable depth of the hole, which is the effect of holes.