Branch Snyder Department of International Ltd. Shenzhen-Electronic Technology Co., Ltd. - The Department of Electronic Technology Company is a professional custom single-sided, double-sided, 2-40 storey density multilayer professional supplier, to provide customers with high-precision high quality Shenzhen board, quality assurance, reasonable prices. Also called slope for the PCB temperature from ambient temperature to be raised to the activation temperature. In this area, welding circuit board process, the heat capacity of the circuit boards and components are different, they actually raise the temperature of the different rates. Temperature circuit boards and components should not exceed 2 ~ 5 ℃ per second speed continuous rise, if excessive, cause thermal shock, Shenzhen circuit board technology, circuit boards and components that are likely to damage, such as tiny cracks ceramic capacitors . The temperature rise is too slow, the paste will be excessive temperature, solvent evaporation is insufficient, affecting the quality of welding. Oven preheat zone usually accounts for the entire length of the heating zone of 15 to 25% Branch Snyder Department of International Ltd. Shenzhen-Electronic Technology Co., Ltd. - The Department of Electronic Technology Company is a professional custom single-sided, double-sided, 2-40 storey density multilayer professional supplier, circuit board technology tutorials, to provide customers with high-precision, high-quality Shenzhen circuit boards, circuit boards common problem solving methods, quality assurance, reasonable prices. Welding roughly divided into preheating, insulation, reflux, cooled four intervals (different BGA rework station work to do slightly different) regardless of lead solder or lead-free solder, solder balls are reflow zone melting stage, except that the temperature has Different reflux former curve can be seen as a slow heating and insulation process. Understand this basic principle, any BGA rework station can be so. Phone circuit board technology, the Shenzhen circuit board technology, Newell Newell hit by the Shenzhen Electronic Technology Limited. Newell Shenzhen Electronic Technology Co., Ltd. (www.yipcb.com) (www.yipcb.com) strong, credible, a printed wiring board in Shenzhen, Guangdong and other industries has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Newell invasive and you hand into the brilliant, for a better future!