I am working on building "Build Your Own Clone" guitar effects pedals, and am having some difficulties soldering. Everything seems to work fine for about a half hour. I try to keep the soldering tip tinned and turn off the iron if I won't use it for more than 5 minutes. After soldering 5 or 10 components over a half hour or so, my soldering iron tip becomes unusable. It has clumps of solder on it. I cannot remove the old solder with a sponge, and new solder will not melt on the tip. Attached is a picture. What is going on here? My iron is a ZD-99, and it is temperature adjustable. I am using 60/40 leaded solder with flux.
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