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You will not transfer much heat to the wire joint to be soldered by just touching the bare tip to it. Instead, melt a blob of solder onto the hot tip, then touch the joint, and the molten solder will greatly help the heat transfer to heat the joint to soldering temperature. Then touch the joint with the solder wire and it will quickly melt right into the joint and flow well. You will be surprised at how much easier this makes the soldering process!