If the reflow profile provides insufficient heat, it will result in bad solder joints which is one of the most common defects. On the other hand, it is important for the temperature to be high enough in order to achieve the desired results. The time is about 30 to 60 seconds and it should not exceed to avoid the creation of brittle solder joints.Īnother thing that you should know is that the peak of the temperature has to be strictly controlled as many of the components could fail if they are exposed to excessive heat. The time in which the solder is held above the melting point temperature (time above liquidus) is important to ensure that the "wetting" occurs between the printed board and the components. Reflow- In this general stage, the temperature in the oven is increased above the melting point of the solder paste, forming it into liquid.The soaks last no more than 60 to 120 seconds, depending on the type of assembly. Soak- This is the part of the project in that ensures that the components have reached the required temperature before entering the next reflow stage.Fast heating could cause component defects such as Proheat- During this phase of the process the printed circuit board, components, and solder are heated to a specific dwell or soak temperature, with the main aspect, which is not to be heated too quickly (usually no more than +2 degrees a second). To create an appropriate reflow profile, thermocouples are connected to a simple assembly (often using high-temperature solder), in different locations to measure the range of temperatures across the printed circuit board. The process is focusing on creating acceptable solder joints with pre-heated components, which provides the opportunity to melt the solder without causing damage by overheating. Reflow soldering is the most popular and widely used method of connecting surface mount technology (SMT) components to a Stick around to review in-depth and learn everything you are looking for. Air or nitrogen is heated to a high enough temperature and then blown to the assembly, and the solder on both sides of the component melts and bonds to the motherboard.Ĭritical steps in reflow soldering, and common After a solder paste is used to attach thousands of tinyĮlectrical components to their contact pads, the entire assembly is sent to a controlled heat.
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