Formula: gram weight X0.00 15. If the thickness is known, the gram weight is: thickness /0.00 15. The distance between the opposite upper and lower sides of an object. Refers to the thickness of an object. Symbol "t" in millimeters
Compared with surface mount technology and manual welding operation, lead-free technology has a stronger demand for lead-free wave soldering. There is still a long way to go to have a solid understanding of all aspects of wave soldering.
Extended data:
By remelting the solder paste pre-distributed on the printed circuit board pads, the mechanical and electrical connection between the solder terminals or pins of the surface mount components and the printed circuit board pads can be soldered.
Wave soldering is a new welding technology with the enhancement of people's awareness of environmental protection. Tin-lead alloy was used before, but lead is a heavy metal, which is very harmful to human body. Therefore, lead-free technology is popularized, * Sn-Ag-Cu alloy * and special flux are used, and the welding temperature needs higher preheating temperature.
In most products that do not need miniaturization and high power, TH or hybrid technology circuit boards are still used, such as televisions, home audio-visual equipment and digital set-top boxes, and perforated components are still used, so wave soldering is needed. From the technological point of view, wave soldering machine can only provide a little adjustment of the most basic equipment operation parameters.
Baidu Encyclopedia-Bo Fenghan