Can anyone help me solve a problem I'm having with soldering. About half the time it works perfectly and the rest does not. I sandpaper the metal and rub it with alcohol, then bind the joint (say, a landing gear) with copper or steel wire, then smear with flux and heat the part with a Weller iron. I've also used hobby-sized and full-sized blow torches. The silver solder flows on to the joint and then flows right off again. In any case, the joint fails. The problem is usually with wire-bound joints. Should the wire be wound closely or wider apart? Should I be using a better flux? I used to use a liquid flux that got better results. Any tips would be appreciated. Thanks.