When speakers are not talking or signal is not weak

 When speakers are not talking or signal is not weak, the receivers of green laser pointer will automatically mute.
This makes the incubation period of growth of undercooled austenite, C curve to the right and the shape change, temperature change partial disappearance, such as the curve updw below (known as CCT curves) Therefore, the actual quenching, as long as the cooling rate is not updw meet the curve the austenitic Figure 4 C curve can be transformed into martensite, the cooling rate curve is just tangent to the updw line, the cooling rate is called the critical cooling rate of the martensitic transformation. To get the full martensite, the cooling rate must be greater than the critical speed of the martensitic transformation. Conventional quenching water quenching cooling rate of about 600 ° C / S. Laser Hardening, due to the high power density, the heating time is short. Portable receivers of green laser pointer are specially designed for personal users.
According to calculations, the cooling rate of the laser hardening up to thousands of degrees per second, an order of magnitude higher than the maximum cooling rate of the conventional heat treatment. Therefore, the laser heating workpiece is very easy to achieve self-quenching. 4 laser quenching the metal surface of the surface preparation depends on the surface of the laser radiation energy absorption capacity. General metal surface after machining, surface roughness is small, the reflection rate of up to 80 ~ 90%, the metal surface to absorb light energy efficiency. In order to improve the efficiency of absorption of the metal surface of the laser in front of the laser hardening of surface preparation. Surface preparation methods to including phosphide France, to improve the surface roughness, oxidation, and spray coating method, coating method. green laser pointer is convenient for users to carry with.
The user should use the goggle to protect the safety and security of themselves
One of the most commonly used are the following: 1) black coating method) is coated on the surface of the parts with carbon ink or graphite - binder mixture, the formation of the absorbing film, the absorption rate of up to about 90%, increase carbon materials . This method can be used for any material can also be a partial coating, the coating thickness is difficult to control, the laser will produce a dazzling light and smoke effects are not very stable. With black paint applied to the part surface coating absorption rate similar to the carbon coating, the coating adhesion.