How to reduce the transverse temperature difference of reflow soldering temperature

During the reflow soldering process, due to factors such as heat conduction and component placement, uneven temperatures on both sides of the component can often occur, resulting in a lateral temperature difference. To reduce the lateral temperature difference in reflow soldering, JEENOCE suggests taking the following measures:

1. Improving the design structure of reflow soldering furnace

In the design of reflow soldering furnaces, multiple layers of furnace walls and the addition of heat dissipation fins can be used to increase the heat dissipation area of the furnace walls and reduce the impact of heat conduction. Meanwhile, the airflow inside the reflow soldering furnace can also be adjusted to distribute heat more evenly.

2. Adjusting preheating temperature and time

Before performing reflow soldering, it is necessary to preheat the components to reach a certain surface temperature. The difference in preheating temperature and time can lead to uneven temperature on both sides of the component. Therefore, it is necessary to adjust the preheating temperature and time according to the characteristics of the component and the performance of the reflow welding machine, so as to minimize the temperature difference on both sides of the component.

3. Reduce reflow soldering temperature

When performing reflow soldering, the reflow soldering temperature can be appropriately reduced to reduce the temperature difference on both sides of the component. However, it should be noted that reducing the reflow soldering temperature may lead to a decrease in welding strength. Therefore, it is necessary to appropriately reduce the reflow soldering temperature while ensuring welding strength.

4. Increase the area of the preheating zone

During reflow soldering, the preheating zone is the first area where the component is heated, so increasing the area of the preheating zone can reduce the temperature difference on both sides of the component. This can be achieved by increasing the length and width of the preheating zone.

5. Using high-quality solder

When performing reflow soldering, using high-quality solder can reduce the occurrence of welding defects, thereby reducing the temperature difference on both sides of the component. It should be noted that different brands and models of solder may vary, and testing and screening are necessary before use.