What is brazing in plumbing?
Mechanically this is the same process as soldering. It can be distinguished from soldering by temperature: in brazing the filler metal melts above 840 °F (450 °C). Because of the higher temperatures a brazed joint is stronger than a soldered joint.
Which gas is used for brazing of copper pipes?
For most brazing jobs using oxygen-acetylene gases, a carburizing or neutral flame should be used. The neutral flame has a well-defined inner cone See diagram. Avoid an oxidizing flame. Excess acetylene removes surface oxides from the copper.
What is the process of brazing?
Brazing is a metal-joining process in which two or more metal items are joined together by melting and flowing a filler metal into the joint, with the filler metal having a lower melting point than the adjoining metal. The filler metal flows into the gap between close-fitting parts by capillary action.
What’s the best way to braze copper pipe?
When you’re finished brazing, slowly close the oxygen knob on the torch, followed by the acetylene knob and then close both tank valves to make sure no gases are passing thru. I always like to purge my hoses before saying I am completely done.
When do you need to braze a water line?
Brazed joints are used for refrigeration, high-pressure air lines and HVAC where maximum joint strength is a must, and soldered joints are used in low-pressure applications such as potable water lines and some heating systems.
What kind of solder do you use to braze a water line?
The tools and type of filler materials vary from a soldered joint to a brazed joint, so let’s go thru both of them together. When soldering potable water lines, you’ll be using this type of solder which is called 95/5. This type of solder can’t be used when brazing so, you’re gonna be needing a filler material.
What kind of torch do you use to braze pipes?
Brazing smaller pipes is possible with a small propane torch, but larger pipes such as 1” and up require more heat, therefore, it’s recommended to use an oxy/acetylene system with an appropriate torch seeing silver solder melts at a higher temperature than normal solder.
What’s the best way to heat a brazing pipe?
Start heating the tube, first applying flame at a point just adjacent to the fitting. Work the flame alternately around the tube and fitting until both reach brazing temperature before applying the brazing filler metal. 2. When a flux is used, it will be a good temperature guide.
What kind of metal do you use to braze copper pipe?
The joint surface MUST be clean. Refer to the Harris Filler Metal Selection Guide for recommended brazing Filler Metal selection. When brazing copper to copper, alloys such as Dynaflow®, Stay-Silv® 5, or Stay-Silv® 15 are recommended. These alloys contain phosphorus and are self- fluxing on copper.
Brazing smaller pipes is possible with a small propane torch, but larger pipes such as 1” and up require more heat, therefore, it’s recommended to use an oxy/acetylene system with an appropriate torch seeing silver solder melts at a higher temperature than normal solder.
Brazed joints are used for refrigeration, high-pressure air lines and HVAC where maximum joint strength is a must, and soldered joints are used in low-pressure applications such as potable water lines and some heating systems.
