[Poland308]

http://www.harrisproductsgroup.com/en/P ... ckade.aspx

I've been using this for a while now to repair copper tubes in old steam coils. It wets out real nice and deals pretty well with the embedded mineral deposits left from steam or water. I use the tig welder to get precise heat control on the paper thin copper. It has a low melting point and excels at building up material over holes without dripping into the tube. I bought about a lb / the 20 stick tube for less than 25$. I also used it on some steel to copper joints where the coil headers are joined to steel pipe, and on an old brass impeller for a grinder pump. Used it to build up some worn spots and chips from junk getting stuck in the pump.

[LtBadd]

Used with TIG, interesting. So you use the rod just as filler, no flux needed even on steel and brass?

[Poland308]

Correct! I brushed off as much as could with a wire brush and then go at it.

[Rupes]

Being a plumber I use silver solder, usually 5% silver. Wets really nice and a bit more ductile and flows a bit better than 2%. Doesn't fill real well though unless you are really careful. Might be handy for filling when the idiot builder puts screw holes in my copper. Wonder if its exclusive to Harris or under other trade names.

[Poland308]

This stuff has a lower melting temp than any of the silver bearings braze rod. I use 15% and 45% a lot for refrigeration. I've never tried this stuff on refrigeration coils or pipe.