I'm guessing you want to become better at soldering chassis. So let me point out that whoever came up with the idea of heating your joint before applying the solder never built a slot car, worked with a wave soldering assembler or tinned copper gutters on a breezy day. Probably didn't do a lot of electronic assembly after the vacuum tube days either! What you want to do is make sure everything is clean of course, use a toothpick with a slightly crushed end to apply acid flux where you want solder to be, use another toothpick to apply oil lightly where you don't want solder to go, apply just enough solder to the iron before you touch it to the parts you want soldered. Once you touch the molten solder to the workpiece you'll see it flow quickly across the workpiece and you can lift your iron as soon as it reaches the extent you desire. Surface tensility will pull excess solder away from your joint leaving a nice neat clean joint. Small parts like pin tubes will lift with the iron but you can hold them down with the edge of a lightly oiled exacto knife. And practice, practice, practice...
Chris Dadds, Master Carpenter
Building beautiful, smooth slot car tracks for your home, club or raceway since 1987!
(I only build things so I can support my tool collecting habit.)
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