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Copper is one of the most widely used metals in the construction industry. Copper brazing refers to the welding of joints at high temperatures. The method is often used by engineers as an alternative to welding when temperatures above 850 degrees are being used for soldering purposes.
There are many benefits to using copper brazing for joint melding work. For example, they protect against fires that are present near the joints and raise the temperature. They are also better suited for air conditioning and refrigeration purposes. Not to mention, they work better for fuel gas distribution systems. Water supply tankers and reservoirs also do not corrode joints melded using copper brazing.
There are certain points that should be kept in mind when preparing to braze copper. A slightly carburizing flame should be used and proper fluxes are essential when using silver brazing alloys. Lap joints work best with an annealed copper brazed joint. Both oxygen free and oxygen bearing copper can be used for brazing work.
The clearance for allowing filler metal penetration in small to medium diameter pipes should not be more than 0.002 to 0.003 inches. For large diameter pipes, clearance should not exceed 0.008 to 0.100 inches.
For forming the joints, there are two methods that can be used. You can insert the filler metal in the joint recess or you can feed in the filler metal from the outside after heating the joint up to the right temperature. Keep in mind that a scarf joint can be used for forming joints where double thickness is not a desired trait for the lap.
For more tips and tricks about your favorite metallurgical processes, head on over to NTT. There is an on-site course available on Brazing for HVAC which includes working with copper. Discover thorough courses and seminars on all the topics you wish to explore, and find guidance under industry leaders and experts from every field!
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