There are two methods for manual repair soldering: one is contact soldering repair, and the other is heated gas soldering repair.

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In addition to good welding equipment, it is also necessary to have the welding tools needed for good welding. These welding tools are responsible for preparing the material before welding and cleaning the surface after treatment.

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Whether the board should be cleaned before soldering depends on the condition of the board. Those boards coming directly from PCB manufacturing should be clean due to the safe quality control techniques used throughout the manufacturing process.Likewise, fully assembled boards delivered to the end user do not require any additional cleaning if they have been carefully packaged and shipped.

Matters needing attention when welding SMT chips a. Generally, the time of the whole welding operation of the solder joint is controlled within 2~3s. b. The time between each welding step is very important to ensure the welding quality, and it needs to be mastered gradually through practical operation. c. After the welding operation is completed, the position of the welded part cannot be changed until the solder paste is completely solidified. d. The electric soldering iron should generally be an internal heating type (20~35W) or a constant temperature type, and the temperature should not exceed 300℃. Generally, a small conical soldering iron tip is used.