Friday, December 6, 2013

SMT Reflow Soldering Oven Advantages

By Tiffany Gill


SMT reflow soldering oven is used for attaching different electrical components to the boards. In this process, the solder paste, which is a mixture of powdered solder and flux, is used for connecting the joints permanently. Standard ovens used for this purpose are much larger, and this makes these types of devices more convenient for different purposes, for example, in labs.

These devices are generally used for different surface mount components. Using smaller, energy efficient and compact models provides reduced assembly costs. Computer controlled heat won't cause any damage to even the most sensitive parts. The whole process consists of at least four different stages, or more.

In the first stage, often called the preheat zone, the solvent in the paste begins to evaporate. In thermal soak zone the fluxes are temporarily attached. In the third stage, also called the reflow zone, the maximum temperature is reached. This temperature depends on the component with the lowest tolerance on high temperature.

Cooling zone is important part of the process. In this stage, the board is gradually cooled, and the joints are solidified. A cooling rate depends on components sensitivity as well. Generally, the rate of four degrees of Celsius per second is the most commonly used. Cooling rates have a significant effect on solder joint grain structure.

There are different types of SMT soldering ovens, including medium to high volume models, the ones designed as bench top models, and also nitrogen based. Compared to standard devices designed for the same purpose, they provide lower energy consumption and take up less space. Compact and practical, they can find their usage in different processes.

With at least four independently controlled heating zones, medium to high volume machines are additionally equipped with numerous very useful things, including independent thermocouple inputs. Computer operated and calculated functions make these devices easy to operate and maintain. Smaller devices are often used for prototyping, for example.

The whole process is computer operated and controlled. Parameters can be set automatically, or manually adjusted. The set of parameters can be saved to a memory. Once you reload the saved set, you can adjust individual parameters to suit your present needs. This include specific zone temperature settings and upper and lower limits.

These compact sized models provide very good efficiency, easy handling and low consumption of energy. Advanced thermal management options and other innovative possibilities are making them very useful in all types of industries. Safety systems include audible and visual alarms and automatic shutdown options.

Larger SMT ovens provide up to ten controlled upper and lower full-convection heating zones. They provide maximum functionality, automatic hood-life mechanism and high precision conveyor mechanism. This is a reliable solution for all medium and high volume manufacturers. It combines high mass heat sources with efficient thermal heat transfer, ensuring very good process stability.

Different types of SMT reflow soldering oven with pin over mesh conveyor system meet any production requirement. Pin conveyors permit inline and double-sided processing. All components are built of high quality stainless steel, to maintain dimensional tolerances at the high temperature lead-free processing. All systems are equipped with special battery backup.




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