From: "Chuck Guzis" <cclist at sydex.com> On 1/13/2006 at 2:05 PM Sridhar Ayengar wrote: Not really--"high temperature" is relative in this case. I use an acetylene-air torch for soft-soldering; many use oxyacetylene (you're dealing with a big hunk of metal and local heating is more improtant that getting the entire part hot). The problem is that joints are of the plumbing sort--you depend on capillary action to form the joint and fill any small gaps. Eutectic Sn/Pb is ideal. The substitutes, including some rather expensive indium alloys that I've tried, just don't flow the same way. I don't know of any plumber who perfers lead-free solder to the leaded kind.