Nowadays, with development of the SMT towards the high density and the microminiaturized direction, the high integrated production request of printed circuit board assembly (PCBA) proposes the huge challenge to the reliability of reflow soldering. In the process of reflow soldering of the PCBA, warpage deformation is one of the important problems in the reliability research. And it will cause registration problems in chip placement as well as solder joint failure. Therefore, it has extremely th...