红色AAA级黄片-91成人爽a毛片一区二区-有没有一级片黄色电影免费-国产一级二级三级黄色片-国产aaa级成人片-欧美黄色一级成人片-美女大黄大色一级毛片-欧美黄色一级高清视频播放-搜索中国1级裸体黄色片

Industry News
Location:Home >> News >> Industry News
How to choose when the soldering temperature lead-free solder? How to choose the shape of the tip?
For lead-free soldering temperature selection should take into account the thickness of the PCB board, whether the size of the pad, the device and the surrounding area have a greater cooling, suggest that the use of conventional solder temperature is selected around 350 ℃, to meet the requirements of the situation in the size of the tip of the election as much, because the larger the tip, the greater the heat capacity, the temperature can be set lower, the less heat loss. In this case the relative increase welding speed will ensure the quality of welding.