It appears that you are describing a multiple ZONE lead free profile.
Multiple zones are required for production soldering to ensure that the assembly being soldered is heated in a safe and controlled manner. This ensures that the board and components are heated from room temperature to reflow temperature and back to room temperature without damaging overheating or underheating that would cause cold solder joints.
You can consult with your solder paste supplier for information on the proper parameters for your solder.
Edward Zamborsky
Regional Sales Manager
OK International Inc.
Ed Zamborsky is a Regional Sales & Technical Support Manager for Thermaltronics, located in New York. His position requires frequent customer visits throughout North America and the Caribbean and his position encompasses not only sales but the role of trainer and master applications engineer for all of Thermaltronics products. His expertise includes such specialties as hand soldering, convection and conduction reflow techniques, array rework, fluid dispensing equipment, and fume extraction. Ed has authored many articles and has presented many papers on topics such as; Low Volume SMT Assembly, Solder Fume Extraction, SMT Rework, BGA Rework, Lead-Free Hand Soldering, High Thermal Demand Hand Soldering, Lead Free Visual Inspection and Lead Free Array Rework.
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