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Wave soldering
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==Effects of cooling rate== It is important that the PCBs be allowed to cool at a reasonable rate. If they are cooled too fast, then the PCB can become warped and the solder can be compromised. On the other hand, if the PCB is allowed to cool too slowly, then the PCB can become brittle and some components may be damaged by heat. The PCB should be cooled by either a fine water spray or air cooled to decrease the amount of damage to the board.<ref name=Todd>Todd, Robert H.; Allen, Dell K.(1994). Manufacturing Processes Reference Guide. New York: Industrial Press Inc.</ref>
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