What to use to braze copper to stainless steel?

[twophase]

Hey guys. Anyone have suggestions on what brazing alloys will work for brazing copper tubing to 304 stainless fittings? This is a plate heat exchanger as an r134 evaporator. Thanks in advance.

[2sac]

silver solder

[t527ed]

silver solder

+1 the good stuff and the white paste flux.

[jimp]

Hey guys. Anyone have suggestions on what brazing alloys will work for brazing copper tubing to 304 stainless fittings? This is a plate heat exchanger as an r134 evaporator. Thanks in advance.

I just did a couple and used 45% with the Harris white paste.

[ryan1088]

I just did a couple and used 45% with the Harris white paste.

I was thinking 45% coated rod.

[jackintheboxtec]

The orange coated rod

[supertek65]

X2

I use 50%flux coated rod
And paste.

The real trick is EVEN heat.

I use a smith torch with the round tip.

The orange coated rod

[grkmano]

stay bright? with flux

[monkeyman#1]

56 percent silver and flux, does a great job, nice flow

[twophase]

silver solder

So when you say silver solder, I assume it's different from the lead free plumbing solder? I know that's got a decent ammount of silver in it.

I have a little bit of blue flux coated rod that looks like it's a pretty high silver content. Anyone know what that might be? I only have six 3/8 in. joints to make and those packs of high silver alloys are brutally expensive. If the silver plumbing solder will work, I'll probably just try that since it is just a personal project, long term reliability is not a major concern, and it's on the low pressure side. If not, I'll just have to cough up the $$$.

[jimp]

I was thinking 45% coated rod.

I like to control the flux, and brush it on before I braze.

[supertek65]

NO 95/5 solder will NOT work!

The blue rod will work.

Orange better. 56% silver. 23% copper. Zinc and tin.

You buy it by the rod

You only need one!

[2sac]

So when you say silver solder, I assume it's different from the lead free plumbing solder? I know that's got a decent ammount of silver in it.

I have a little bit of blue flux coated rod that looks like it's a pretty high silver content. Anyone know what that might be? I only have six 3/8 in. joints to make and those packs of high silver alloys are brutally expensive. If the silver plumbing solder will work, I'll probably just try that since it is just a personal project, long term reliability is not a major concern, and it's on the low pressure side. If not, I'll just have to cough up the $$$.

Safety Silv 45% . Plumbing solder will not work. Sears sells the coated rods the others are talking about. Any welding or gas supply store should have those also.