Apr 04, 2020
For laser welded diamond saw blade, it is necessary to detect the appearance, microstructure, and welding strength. Appearance inspection is mainly used to detect whether there are macro defects in welding, such as hole crack, undercut, and incomplete penetration. Generally, 100% inspection is needed. Apparent structure inspection is mainly used to detect the change of chemical composition, apparent structure, and phrase structure of welding parts. The research shows that the fine chemical composition of melting zone tissue appears gradient diffusion, the hardness of the transition layer is lower than that of the base body, higher than that of the cutter head, showing Gradient change. The welding strength testing mainly tests the tensile strength, bending strength, impact toughness, and residual stress of weldments. Generally, 100% of welding strength testing is required. Different special testing tools have been developed at home and abroad, such as the spe623 welding strength testing machine in Germany and torque wrench in China. At present, the residual stress testing of weldments is basically not involved, while the residual stress after welding is not involved The value and distribution of stress seriously affect the service life of the diamond saw blade.
At present, there are still some problems with the laser welding of a diamond saw blade. We need to further study the formula of matrix or transition layer material for special laser welding of diamond saw blade, the research of new ultra-fine or nano pre alloy powder, and the mechanism of laser welding of diamond saw blade, especially in the process of laser welding of diamond saw blade Research on temperature field, flow field, mass field, and stress field, and Research on on-line quality monitoring technology of laser welding diamond saw blade process. In fact, only by fully understanding the mechanism of laser welding diamond saw blade, can we develop a new on-line quality monitoring technology; only by mastering the theory of pre-alloyed powder, can we develop a new ultra-fine or nano pre-alloyed powder and better use the new ultra-fine or nano pre-alloyed powder to develop a special diamond saw blade.