Joining Brass to Copper with Braze™

Joining Brass to Copper with Braze™


Welcome! Lucas-Milhaupt brings you 70 years of expertise in the brazing industry. Today we’re gonna demonstrate joining brass to copper with our lowest melting temperature, Cadmium-free silver brazing alloy, Braze 560. This alloy
is a near eutectic with a melt range from 1145-1205 degrees Fahrenheit. The material
freely wets and flows on the surface of both brass and copper based materials. Please note that the brazing sequence used for this alloy can be used for most of our other silver brazing alloys. Step one is to remove any temperature sensitive parts, then clean the tubing and
fitting. Parts should be properly cut and reamed to remove burrs. Cleaning should be performed so that the surface contaminants are removed without unwarranted loss of the base metals. Lightly roughen the tube ends and the fitting with wire brushes, steel wool or fine grades of abrasive papers. Any residual particles in the joints surfaces should be
avoided and any residue remaining after mechanical cleaning must be removed. The next step is to apply flux to the assembly. When applying the flux, a uniform, brushed on coating is
all you will need. Over-fluxing, or under-fluxing of joints may lead to problems in the process such as increased buracity in the braze joint or difficulty removing flux residue. Step
3 is to assemble the joint and begin heating. Apply heat with a reducing flame to minimize oxidation of the part. Heat the part evenly and uniformly. The flux will indicate when
to apply filler material to the braze joint. Step 4 is to apply the filler metal when the
flux is completely molten and clear. Note the fluidity of the alloy as it flows freely
and capillaries through the joint. Here you see the finished braze joint and fillet. Step
5 is to quench the part; this will shock off the majority of the flux residue. Wait until
the filler metal has cooled below its solidification point before quenching. Make sure all color has left the assembly prior to quenching. This will ensure that the filler metal stays
in the joint. Flux residue can also be removed in a bath of hot water as fluxes are salts
and will dissolve well into an aqueous solution at higher temperatures. The flux residue must be removed, as the flux is corrosive. After brazing, inspect the joint for any voids or lack of fill. To summarize, these are the steps for joining brass to copper with Lucas-Milhaupt’s Braze 560. Clean the tubing and fitting, apply the flux, assemble the joint
and begin heating, apply the filler metal, then quench the part and remove residue. For more information on brazing, please visit our website or contact your Lucas-Milhaupt
representative, thank you.

9 Comments

  1. i just had the most difficult time of my life doing one on my hotwater tank god damn it i wasnt using enough paste after 2 or more hours i succedes by disassembling the whole thing cleaning it cery very very damn stupidly clean then shit load of flux and then i got lucky and hope to never do this again in my whole life

  2. Can I use solder that is using welder in the electronic components to brazing copper with brass and aluminum? Please advice

Leave a Reply

Your email address will not be published.


*