![]() ![]() While wetting begins at the solidus temperature, best wetting is achieved at a peak temperature 15º C or more above the liquidus. Alloys are called eutectic when the solidus and liquidus are equal.In between the solidus and liquidus, a region called the plastic range, some portion of the alloy is solid but the majority is liquid.Below the solidus, an alloy is 100% in a solid state.The phase change from the solid state to the liquid state begins upon reaching the solidus and ends upon reaching the liquidus. ![]() *Eutectic – Solidus and Liquidus are equal **MP – Melting pointĮach alloy has temperatures at which it changes from solid to liquid ( Figure 1). Some applications that fall under the RoHS directive are exempt from being lead-free because the reflow temperature requirements can only be met with high-lead solder alloys which are exempt under RoHS regulation.įigure 1. ![]() Sometimes this is due to the product falling under the RoHS (Restriction of Hazardous Substances) directive and sometimes it is a corporate directive. Many applications have a requirement for use of lead-free solder alloy. What type/size does the power need to be for the smallest feature in the application?.Is there a reflow temperature requirement or limitation?.When choosing a solder alloy, there are a few questions that need to be answered. It is always worth a call to your Nordson EFD solder sales specialist to review requirements to ensure you are using the best solder paste for the job. There are additional details of alloy and flux performance not covered that can be very important in the selection process. ![]() KingPCB is very knowledgeable about solder types and other elements of PCBs, such as types of substrate materials, board variations, and important design features.This guide covers the most significant steps in selecting a solder paste. Choose your soldering partner wisely, research carefully for your requirements and provide a soldering process that works for you. The type of soldering is just one of the many elements of PCB assembly. Reflow soldering is typically used for small-scale manufacturing products that do not require a method suitable for fast, inexpensive mass production. To sum up, wave soldering is faster, cheaper, and cost-effective for high-volume orders. When using reflow soldering to manufacture printed circuit boards, you don’t need to worry about controlling the environment. Failure to create the correct wave soldering environment is more likely to result in board defects. However, in some ways, wave soldering is more complex and requires careful monitoring of issues such as board temperature and the time the board spends in the solder wave. The choice of which type of soldering to use depends on a variety of factors, such as pad shape, component orientation, PCB type, etc.įor printed circuit boards with through-hole components and larger surface mount components, wave soldering is an ideal method. SMT (manual or automatic machine placement).It is refers to the use of solder paste (a mixture of solder and flux) to connect one or more electronic components to a contact pad and then melt the solder by controlled heating to achieve a permanent bond. Reflow soldering is different from wave soldering and is commonly used to solder surface mount components. Need to clean wave solder holes and solder components.Need for solder rework after wave soldering.Failure to adequately control the temperature may result in cracking and electrical loss. Insert the component into the corresponding holeĭuring the wave soldering process, it is worth noting that proper temperature is very important.It is called “wave soldering” because the soldering surface of the plug-in board is in direct contact with the high-temperature liquid tin, which maintains a sloping surface, and a special device makes the liquid tin form a wave-like phenomenon. Wave soldering is a batch soldering process that allows many boards to be manufactured in a very short period of time. Wave soldering and reflow soldering are common soldering methods for PCB assembly.Įach method has its advantages and disadvantages, and this article will walk you through their meaning and application. The reliability of a circuit board is achieved by sticking electronic components to your board through soldering. Soldering is an important part of the printed circuit board manufacturing process. ![]()
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