This pump creates a solder that can almost be described as a “wave” over the board this sells the board’s components. Wave soldering is done by passing circuit boards over a pan, with a pump, of molten solder. The range for reflow temperature is between 240 and 250 degrees Celsius for a Pb-Free (Sn/Ag) solder. Solder also contains toxins if heated too heavily, so you want to ensure your heat gun is at the correct temperature before starting. A heat gun is a relatively inexpensive method to heat solder paste onto your components and the board however, it still can get quite hot, and thus you need to be careful while handling it. Reflow soldering is done on a smaller scale. When you require bulk soldering, which involves many circuit boards in a short period, wave soldering is the most efficient method. Both have benefits depending on your project. There are two ways of soldering: wave soldering and reflow soldering. Soldering is very important during the PCB design process it’s the only way to adhere circuits to your board. What is the difference between reflow soldering and wave soldering? Reflow Soldering ![]() Have options for repeatable placement for surface mount components.Get a detailed and well-designed printed PCB.Be sure to have a PCB element footprint design.You will require suitable reflow profile conditions.You want to make sure that the reflow soldering process is a success, consider the following: For an Effective Reflow Soldering Process Reflow soldering is a reliable method with very high pitch leads. This secures the electrical components to the circuit board. The board is put through a tunnel with controlled heat to melt the solder paste. Once the solder paste is applied, place the components on the board. You can then use reflow ovens or infrared lamps to produce this high heat-solder individualized solder joints with a hot air pencil. Use controlled heat to reflow the solder paste into a molten state this creates permanent solder joints. Solder paste, a mixture of powdered solder and flux, attaches many small electrical elements to a contact pad. ![]() Reflow soldering is a process that involves attaching surface mount components to a circuit board (PCB). 4 Reflow Soldering for PCB Manufacturing.2.1 For an Effective Reflow Soldering Process.The heat sensitive parts in the machine must be modified, or measures must be taken to prevent heat transfer to these parts. The design of the furnace must be changed to meet such requirements. for lead-free solder or non eutectic solder (used for BGA, double-sided plates, etc.), higher furnace temperature is required, These new processes usually require the temperature in the reflux zone to reach 3500c-4000c. Many furnaces used now are designed to have a high operating temperature of not more than 3000 C. The industry has applied the process as soon as possible, and the time has been saved. However, the industry must probably go through this painful learning period to solve the problems encountered. Nitrogen protection can partially eliminate oxidation and damage to PCB due to temperature increase. ![]() At present, many substitutes developed generally have a melting point temperature of about 40C higher than that of tin lead alloy, which means that reflow soldering must be carried out at a higher temperature. Reliable and economical lead-free solders are being developed. Although the lead used in the electronic industry is very small, less than 1% of the total consumption, it is also prohibited and will be phased out in the next few years. This is mainly caused by the characteristics of the solder alloy and the different fluxes.įor the sake of environmental protection, lead will be strictly restricted in the 21st century. In terms of process, the welding process has the greatest impact. The change in material, especially in solder, is the largest. With the development of environmental protection, people pay more and more attention to lead-free technology. Early reflow solders were all made of lead containing materials. Lead free reflow soldering is also called lead-free reflow furnace.
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