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Topic: Lead free soldering iron:The new Weller model WESD51 is rated for esd protection. Lead-free requires that the soldering iron be adjusted for 20 deg. C hotter than for lead. This requires an iron with a potentiometer and a digital readout. The most popular of these irons were the EC2001M and 2002.
Topic: heat damage: It is possible to damage an led by lingering with the iron, while soldering very close to the body. The safe way is to hold a pair of needle-nose on the leads, up against the body. This requires a helper, unless you have 3 hands.
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