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Selective Soldering  by: John Dean Automated selective soldering is the fastest growing area within electronic assembly due to the ever increasing pressure to improve product quality and shorten cycle times in the manufacturing process. With more complex, double-sided surface mount assemblies, the use of the traditional wave soldering process to solder through-hole components is no longer an option. The higher density and lower ultimate cost of SMT makes it the preferred assembly technology. However, the mechanical strength of through-hole connections continues to make through-hole the technology of choice in assembling connectors. As the number of through-hole components on boards has decreased, hand soldering is primarily used as an alternative. Hand soldering is a manual operation and, therefore prone to defects, such as excessive solder, inadequate hole fill, flux residues and thermal stresses at the solder joints. It is not reliable or repeatable and depends entirely on ability and skills of the operator. Selective soldering is the process whereby specific through-hole devices on a board are selectively soldered using programmable selective soldering machines. Unlike wave soldering, where a conveyor transports boards through a stationary wave, a selective-soldering procedure uses robotics to individually moves the board over a stationary soldering nozzles and tooling (see Fig:1 ) The robotic PCB support fixture is programmed to move the board in an ‘X’,’Y’ & ‘Z’ direction, precisely positioning the board over the solder fountain. Selective soldering uses two different techniques to drag or dip solder individual sites or components on the board. About The Author John Dean, Customer Support Manager, Ultra CEMS. Web-Site: www.ultra-cems.com E-mail: Jdean@ultra.co.uk This article was posted on August 14, 2005 Read More Articles from the "Gadgets and Gizmos" Category: Understanding The Operation Of Mobile Phone Networks by Peter Lenkefi The Science Behind DLP Television by Mitchell Medford The Nintendo Wii is NOT the Game Cube by Kit Allen Family Gift Ideas for the Online Shopper by Chris Robertson Cars with Built-in Vehicle Tracking by Shawn Davis Hitachi 55 Plasma TV Delivers Five-Star Performance by John Lloyd The Advantages of a Dish Satellite T V System by Roger Overanout Privacy Makes Bug Detectors a Must by Shawn Davis Plasma TV Cabling by Jakob Culver Picking Up The Best Satellite TV Deals From The Right Retailers: A Checklist For Satellite TV Shoppers by Teddy LCC << Back to "Gadgets And Gizmos" Index

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