Sweating a brass fitting to a copper pipe
 

When sweating a brass fitting to a copper pipe, how do you when to
remove the torch and apply the solder?

Brass takes more heat. A common mistake is to overheat to the point that your flux melts away. Use good thick flux or you'll fight it...The black stuff that comes in the little snuff cans will cause you headaches a lot of the time.

I heat my fittings and touch the solder to the OPPOSITE side of the fitting as the flame...When the solder melts and sucks in you know you've got it and can pull the heat off. Remember that the solder is drawn toward the flame so you shouldn't apply the solder where the flame is held.

Thanks thekctermite, Very helpful reply.

I just did this in my office, I had to remove a coupler and insert a T to provide water in the warehouse for the swap cooler, just make sure you heat the pipe enough so the solder stick instead of run off.

Thanks for the help cochise7969

And just a clarification, when soldering brass to copper, apply the heat to the brass first. The copper heats faster than brass.

Thanks wrangler for a valuable tip

Exactly what flux and what solder are we talking about.?I have the problem with a toilet drain.

You are probably not getting it hot enough. You might need oxy-acetylene to get it hot enough. A regular can of propane and a cheesy torch head aint going to do it.