Detailed explanation of the working principles of four welding methods during welding
1. Solder suction and soldering method
By utilizing the negative pressure effect of the built-in cavity of the solder absorber, the heated and melted solder is sucked into the cavity, separating the lead wire from the solder pad.
2. Soldering method for removing tin suction ropes
The method of removing solder from the solder pad by using a suction wire is to separate the lead wire from the solder pad by using the suction wire to remove molten solder.
Apply rosin flux to the part of the braided wire, then place it on the solder joint to be soldered, and then place an electric soldering iron on the braided wire to heat the solder joint. After the solder at the solder joint melts, it is absorbed by the copper braided wire.
If the solder at the solder joint is not sucked completely at once, a second or third time can be carried out until it is sucked completely. When the Dynamic rope is full of tin, it can not be used again, and the place full of solder needs to be cut off.
3. Short needle welding method
The empty needle soldering method is to use an empty needle (or a syringe needle) of similar size (with a hole diameter slightly larger than the diameter of the lead) to cover the lead that needs to be soldered. When the electric soldering iron heats up the soldering tin and melts, quickly rotate the needle until the soldering iron is removed and the soldering tin solidifies before stopping. At this point, the needle is pulled out and the lead has been separated.
4. Remove soldering with a tin absorbing soldering iron
Tin absorbing electric soldering iron is a special type of soldering iron that can heat the solder joint and suck the tin into the inner cavity to complete the soldering process.
When using an electric soldering iron for the first time, there are four small steps to follow.
1. Preheating: The soldering iron head is at a 45 degree angle, pressing against the solder pad and component feet.
Pre heat the component feet and pads. The tip of the soldering iron head cannot support the position without copper sheet on the PCB board to avoid burning the board into a single mark; The soldering iron head should preferably be in the direction of the circuit: the soldering iron head should not block the through-hole: the preheating time is 1-2 seconds.
2. Tin loading: Introduce the tin wire from the contact surface between the component foot and the soldering iron; When the tin wire melts, control the incoming speed; When the tin fills the entire solder pad, remove the tin wire; The tin wire cannot be directly placed on the soldering iron head to prevent the flux from burning black; The entire tin loading time is approximately 1-2 seconds.
3. Remove the tin wire: Remove the tin wire and place the furnace extension on the solder pad; The time is approximately 1-2 seconds.
4. Remove the soldering iron: When there is only slight smoke emitted from the soldering tin, the soldering iron can be removed to solidify the solder joint.
