That works well enough, until it doesn't. A few potential problems.
1. You might notice that the typical Weller soldering gun tip is much
stiffer and harder than the soft copper wire. When you try to push on
a solder connection with the tip, the Weller tip will not bend, while
the copper wire tip will bend into a pretzel. Copper alloys can be
"Hardening of Copper Alloys"
2. The copper wire is likely a different resistance than the real
Weller tip. My guess(tm) is that the Weller tip has a higher
resistance than the copper wire. If you have a milliohmmeter or ESR
(equivalent series resistance) meter, measure a real Weller tip and
compare it to the copper wire tip. If the copper wire has a radically
lower resistance, you might find that transformer winding in the
soldering gun will tend to overheat (or simulate a fuse). If the tip
becomes red hot, try a longer wire, or buy a real tip. Use an IR
thermometer to measure the tip temperature. 600°- 650°F (316°- 343°C)
for lead-based solder and 650°- 700°F (343°- 371°C) for lead-free
3. The idea behind a soldering gun is to heat the tip and not the
clamp where the tip meets the screw clamps. If you want to use wire,
I suggest you bend the ends of the wire in the same manner as a real
Weller tip to obtain maximum clamping pressure and surface area:
4. You probably need the blob of copper on the tip to prevent the
flux from destroying the tip. Try twisting the wire near the tip and
maybe beat on the twist with a hammer.
Tech Tips Tuesday, Super Hot Soldering Gun
How to Make a Soldering Gun Tip
Homeade Weller soldering gun tips DIY
Full disclosure: I gave up on soldering guns years ago and no longer
have any soldering guns. Temperature controlled irons are better.
Jeff Liebermann je...@cruzio.com
PO Box 272 http://www.LearnByDestroying.com
Ben Lomond CA 95005-0272
Skype: JeffLiebermann AE6KS 831-336-2558