how to fix bad soldering on water heater

Hi All I just discovered a slow leak at the hot water pipe on the water heater, the plumber installed 2 yrs ago but looks like a bad soldering job. The leak is very, very small, I only own a butane torch for building brass frames for slot cars, could it be used on this joint? I was thinking of putting some flux on it and heating it till the existing solder flows right. Would that work? I never worked with copper pipe before.
TIA <paul>
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You make slot cars? Cool. It's been thirty years.

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yea, still running the old(1/24) ones! Gilbert frames, or my own,and HO with the nephews; but can't race them with the new cars! I use attachment to rebuild the frames.
I noticed the mineral deposits(whitish stuff at joint) on the pipe kinda stopping the leak, can't afford a plumber right now, can my torch fix the leak as I describe? TIA <paul>

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There is no want like that of a twelve year old boy looking at a glass case full of 1/24 slot cars and parts. He knows there is no way he can afford one with his paper route money, so he goes home to his HO cars and the snap together track that always had connection problems.
*SNIFF*
Is it too late for a 46 year old plumber to give his inner child a big cool slot car track with neat 1/24 scale cars and a buncha cool wheels and motors and frames and stuff?

Leave it alone and it will "heal" itself. Seriously.
MM
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Thanks Mark for the info, I now sleep bettah!
The link below is a portal to lots of slot car stuff, 1/24 is cool but has drawbacks, like too big for the house! 1/32 is fast and you can setup a nice layout and the cars are super detailed, HO is okay, I still like it, but too small for some tastes.
I go to the 1/24 tracks just to enjoy the sound of those motors and check my reflexes, (I'm 51!!) The HO clubs, to help save on expenses/time have rules on controllers, cars, I still like Group 7 style unlimited superfast cutting edge building (but no time to do it, like when I was a teen) so I run the 'vintage' stuff I have. Some guys want me to try HO racing again, but I have those time constraints!
Thanks again and I hope the link below will get the motor humming! <paul>
http://www.professormotor.com

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