by imrdirtcars on Thu Apr 23, 2009 5:48 pm
The true challenge of soldering is how do you hold the part, and it took some time to figure out the best method.
Each part has different requirements on how to hold it, how to keep the heat away from soldered joints around it, and how to keep it straight.
I use a couple different soldering irons (with different size tips), though the main one is a Weller 75 watt soldering station. Many parts are torch soldered, since the joint is very clean when you use a torch. I have a couple different torches as well.. a pencil type torch, and a larger 'gun style' torch, that has a nice electric start.. so you just pull the trigger and it's burning.
As far as solders go? I also have a couple different types.. I use silver bearing solder for parts that need to be very strongly bonded.. the main chassis rails for instance are soldered this way. Delicate parts are soldered with very thin electronics solder, that has a low melting point.
The right flux is very important too, i use a very strong acid flux, because it very quickly cleans the joint when you heat it, and the solder flows very smoothly. The problem with using strong flux is getting it cleaned up afterwards, which is a whole other issue i have to deal with.
I've built a number of different jigs to hold the parts, that i've developed over the years. As i build the cars, I create a database of photos of how i hold each part, so i can duplicate it should i forget the next time around.