What should we pay attention to when soldering the circuit board?
What should we pay attention to when soldering the circuit board?
1, electric iron more than 3-5 seconds components and printed circuit boards will be damaged, especially the lead-free soldering temperature for a long time more vulnerable to damage, overheating will make the pad failure, will pcb printed surface lines, board Because of overheating bad
2, surface mount ceramic capacitors, it is easy to heat and then cold and internal rupture, transistor, IC class is also easy to fail, the best use of electrostatic welding of CMOS components soldering iron.
3, welding the wrong, can only take down, no special skills, feel more experience, commonly used maintenance tools tweezers, suction tin, suction tin metal belt, will be of great help to the maintenance.
Suction holes blocked with a suction device, or use tin metal band.
We summarize the soldering iron and the circuit board is 45 degrees, the welding surface is smooth, the solder joint is too big not too small, the welding time should not be too long, it is easy to burn the components and damage the copper wire on the board. Welding sequence is basically from the inside out, the first low after high.
If the soldering general electronic components (no large-scale integrated circuits on the circuit board or other easy to breakdown of the device), soldering iron can not be earthed; if so, it must be grounded or with static ring. General election 30-60W external electric soldering iron, 1mm below the rosin-containing solder, the tip must be clean, wipe on the sponge can not be hard scratch. Soldering, the tip should also contact the device pins and circuit boards, and then into the solder, such as the temperature is suitable, we can see the solder melted, such as mercury, spread from the pin to the circuit board copper pad and fill, soldering iron and solder, soldering carry out. Pay attention to the welding time should be as short as possible, so to ensure the appropriate temperature is very important, can be pre-tested with a soldering iron melt solder.