The SMT reflow soldering process involves the remelting of a previously arranged mud like solder into the solder layer of a printed circuit board, completing the soft soldering of mechanical equipment and protective grounding between the solder ends or pins of surface assembled electronic devices and the solder layer of the circuit board. The advantage of this process is that the ambient temperature is easier to control, and air oxidation can be prevented during welding operations, making production costs easier to manipulate. Novotel will introduce the improvement of SMT reflow soldering process and equipment maintenance.

1、 Improvement Method for Manufacturing Chip Process in SMT Reflow Soldering Furnace with Excellent Quality

1. It is necessary to set a scientific and reasonable temperature curve for SMT production and processing reflow soldering furnace, and conduct real-time temperature curve detection on time.

2. Strictly follow the welding direction during PCB design for welding.

3. Avoid conveyor belt vibration during welding operations.

4. It is essential to conduct a safety check on the actual welding effect of the first printed circuit board.

5. Whether electric welding is sufficient, whether the surface of spot welding is smooth, whether the spot welding appearance is half moon shaped, whether there are tin balls and residues, and whether there are continuous welding and empty welding. It is also necessary to check the color changes and other conditions on the surface of the PCB. Adjust the temperature curve based on the inspection results. Regular inspection of weld quality is required in batch production.

6. Regularly inspect the SMT production and processing reflow soldering furnace for cleaning. Due to the long-term operation of the equipment, organic chemical or inorganic pollutants such as rosin adhered to the formation, in order to avoid secondary pollution of the PCB and ensure the smooth progress of the process technology, regular maintenance and cleaning should be carried out.

2、 Common problems in the maintenance and operation of SMT reflow soldering equipment

1. It is necessary to establish rules and regulations for the maintenance of SMT production and processing reflow soldering equipment. After using the SMT production and processing reflow soldering furnace, it is necessary to carry out equipment maintenance work, otherwise it is difficult to maintain the service life of the equipment.

2. Conduct daily safety inspections, maintenance and upkeep of various parts, and pay attention to the conveyor belt to prevent it from getting stuck or falling off;

3. When repairing equipment, the power should be turned off in standby mode to prevent electric shock or even short circuit faults;

4. The equipment must be stable and not tilted or in unstable conditions;

5. Regularly inspect the SMT production and processing reflow soldering furnace, including the furnace, conveyor belt, and cooler for cleaning, and develop weekly, monthly, and quarterly maintenance plans to ensure the quality of SMT production and processing reflow soldering.