Soldering Copper to brass/alloy fittings

[walker]

Anyone have any tips on soldering copper pipe to brass/alloy fittings?  I seem to have no problem doing copper to copper, but from copper to brass especially if its the bottom side of a vertical joint I seem to have some difficulties.

[harshal]

I do soldering on 3/4 in copper to brass fitting on water heater all time.no sweat on it.i use the map gas i think its hotter than the blue gas .i mean its has higher temp for soldering.not sure what size of your tubing are?

[walker]

Just 1/2 inch usually. And I've used the yellow Mapp Gas, just doesn't seem to stick, I don't know if I'm just not cleaning it good enough or what.

[bster352]

This is more for fixtures and anti-scald valves but maybe due to the no-lead. You could try the Masters Tinning Flux if you are having difficulties.

http://www.gfthompson.com/index.php/masters/masters-tinning-flux4-detail

[newf22]

Just to add to bsteer comment...... Ha that no lead flux works wonders I love it

[walker]

Thanks for the tips, I'll be picking some of that stuff up.