Soldering iron welding method and welding steps for large heat capacity welding parts
1. Manual welding technology
① Three ways to hold the soldering iron when welding
② How to hold solder wire
③ Cleaning and tinning on the welding surface before welding.
④ Master the welding temperature and time.
⑤ Properly control the heat generated by the solder joints.
2. Welding steps for large heat capacity weldments
For weldments with slightly larger heat capacity, a five-step welding method can be used:
① Preparation: Place the parts to be welded, soldering iron, solder wire, soldering iron stand, flux, etc. on the workbench in a convenient place for operation. Heat and clean the working surface of the soldering iron tip, and apply a small amount of solder.
② Heating the workpiece to be welded: Place the soldering iron tip on the welding point to heat the soldering point; the working surface of the soldering iron tip is coated with solder to speed up the heating rate. If there are more than two components on a soldering point, try to heat the welding parts of all the welded parts at the same time.
③ Melting solder: When the solder joint is heated to the working temperature, immediately touch the solder wire to the welding surface of the welded part. The solder wire should be added in the direction of the soldering iron tip, but should not directly touch the soldering iron tip.
④ Remove the solder wire: When the solder wire melts to an appropriate amount, it should be removed quickly.
⑤ Remove the soldering iron: After the solder joint has been formed but the flux has not evaporated, quickly remove the soldering iron.
For weldments with small heat capacity, the above five-step operation method can be simplified into a three-step operation method:
① Preparation: Hold the preheated, cleaned and tin-lined electric soldering iron in your right hand, hold the soldering wire close to the soldering iron head in your left hand, and assume the position to be soldered, as shown in Figure (a).
② Heating the workpiece and the solder wire at the same time: Touch the soldering iron and the solder wire to the welding point from both sides of the workpiece at the same time, so that an appropriate amount of solder melts and fills the welding part, as shown in Figure (b).
③ Remove the soldering iron and solder wire at the same time: When the solder joint is formed and the heat is reached, remove the soldering iron and solder wire at the same time.
