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Lead-free Solder Wire Reduces Iron Tip Erosion
December 5, 2005 |Estimated reading time: 1 minute
EAST SUSSEX, England — The SR37-LFM-48S from Almit Technology is a lead-free wire designed to reduce the leaching of soldering iron tips and minimize the cost of tip degradation found at higher lead-free processing temperatures.
The Almit cored solder wire is based on the company's lead-free-qualified SR37 flux chemistry paired with a modified SAC alloy — giving the wire its low-wear characteristics at the soldering iron tip. Lead-free alloys have been found to wear at 300% the rate of traditional eutectic formulas. The SR37-LFM-48S is said to deliver degradation rates comparable to that of 60Sn/40Pb alloys, extending tip life.
The chemistry of SR37-LFM-48S allows most of the flux within the cored wire to flow off the tip iron tip during soldering, while a small amount of flux remains on the tip to maintain its condition. The flux released from the iron tip is said to aid in the wetting process to form a stronger joint. The formulation also prevents the flux from charring the tip, even at elevated lead-free temperatures of 380° or higher. This charring has also been known to contribute to ferrous tip-plating erosion. The SR37-LFM48S low-leaching cored solder wire for lead-free hand or robotic cell soldering is available now in 0.5- to 1.6-mm diameters.