Prepping the Soldering Iron

A sharp point is needed to control the flow and direction of the solder, especially on vertical joints. For a pyramid-tipped, acetylene-fueled soldering iron, make sure that the tip is clean and that the four facets are flat and meet at a fine point. Use a grinder with a metal wheel to flatten the facets, then sand them using an orbital sander with 80-to-120-grit paper.