Soldering iron - summary of welding knowledge
1. Knowledge of welding
1) Heat gun temperature: about 380 degrees is appropriate;
2) Soldering iron temperature: 340-200 degrees is appropriate;
3) The function of washing board water: wash off the rosin;
3) IC welding method: stacking tin method;
4) It is better to have rosin in the solder, which is easy to tin;
5) IC removal method: pick up tin;
6) Note: Try not to touch the soldering iron directly with tin in some places, and use heat transfer to melt the solder;
7) Both solder paste and rosin are fluxes; solder paste is used for industrial production, and rosin is used for manual welding;
8) The soldering iron is mainly composed of a soldering iron tip (copper alloy with better heat transfer) and a soldering iron core;
9) It is better to use more solder than less, otherwise there will be false soldering;
10) Solder bridge (the role of tin on the soldering iron head)
11) Select the appropriate welding head according to the characteristics of the device: pointed head (resistance and capacitance), cutter head (IC), B head, etc.;
2. Welding steps
1) Familiar with PCB, identify directional devices (diodes, etc.);
2) Comply with welding rules;
3) Periodic inspection (welding effect of components, short circuit phenomenon), which is very important, discovering problems in stages will greatly reduce the difficulty of troubleshooting;
3. Common errors
1) The orientation of the device is incorrect;
2) Short circuit is the most common welding problem, and it must be checked periodically;
3) The problem of resistance and capacitance;
4. Difficulties
1) IC welding (ICs in various packages need to adopt appropriate welding methods);
3) Pad short circuit (0 ohm resistance);
4) The connection between the lines (tin at both ends can be easily connected);
5. Suggestions
1) Welding needs more practice, practice makes perfect, grasp the rhythm during the practice;
2) Welding is the basic skill of debugging, good welding greatly improves the speed of debugging hardware errors;
