Reflow oven
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A reflow oven is a machine used primarily for reflow soldering of surface mount electronic components to printed circuit boards.
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[edit] Types of Reflow Ovens
[edit] Infrared and Convection Ovens
The oven contains multiple zones, which can be individually controlled for temperature. Generally there are several heating zones followed by one or more cooling zones. The printed circuit board moves through the oven on a conveyor belt, and is therefore subjected to a controlled time-temperature profile.
The heat source is normally from ceramic infrared heaters, which transfers the heat to the assemblies by means of radiation. Ovens which also use fans to force heated air towards the assemblies (which are usually used in combination with ceramic infra-red heaters) are called Infrared Convection Ovens.
Some ovens are designed to reflow PCBs in an oxygen-free atmosphere. Nitrogen is a common gas used for this purpose. This minimizes oxidation of the surfaces to be soldered.
[edit] Vapour Phase Oven
The heating of the PCBs is sourced by thermal energy emitted by the phase change of a heat transfer liquid condensing on the PCBs. The liquid used is chosen with a desired boiling point in mind to suit the solder alloy to be reflowed.
Some advantages of vapour phase soldering are:
- High energy efficiency due to the high heat transfer coefficient of vapour phase mediums
- Soldering is oxygen-free. There is no need for any protective gas (e.g. Nitrogen)
- No overheating of assemblies. The maximum temperature assemblies can reach is limited by the boiling point of the medium.
This is also known as condensation soldering.
[edit] See also
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