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Brazing With and Without Flowing Nitrogen + Using Silver Solder Rings

HVAC School
432K subscribers
155K views 8 years ago
Tim Bagnall demonstrates brazing with and without nitrogen flowing with 5 different rod/solder types. He also demonstrates the use of solder rings as well as the Hilmor swage tool. When Tim brazes without flowing nitrogen, the inside of the copper tube gets covered in black scale. That scale can flake up and clog up your filter-driers, discharge line mufflers, and other components that connect to your copper piping. When he opens the piping up, the copper is weak and corroded. However, when Tim brazes WITH nitrogen, the copper tube remains black scale-free, regardless of solder type. Tim uses the Harris 0, Sil-Fos 15, Blockade, Blockade FC, and Safety-Silv 56 FC solder on his joints while flowing with nitrogen. (Remember, most of the time, flux-coated rods are for dissimilar metals.) When using solder rings WITHOUT flowing nitrogen, Tim starts off by using the Hilmor swage tool. He then uses the Sil-Fos solder rings. Some scale developed insi …...more
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Brazing With and Without Flowing Nitrogen + Using Silver Solder Rings
2.2KLikes
155,055Views
2016Nov 23
Tim Bagnall demonstrates brazing with and without nitrogen flowing with 5 different rod/solder types. He also demonstrates the use of solder rings as well as the Hilmor swage tool. When Tim brazes without flowing nitrogen, the inside of the copper tube gets covered in black scale. That scale can flake up and clog up your filter-driers, discharge line mufflers, and other components that connect to your copper piping. When he opens the piping up, the copper is weak and corroded. However, when Tim brazes WITH nitrogen, the copper tube remains black scale-free, regardless of solder type. Tim uses the Harris 0, Sil-Fos 15, Blockade, Blockade FC, and Safety-Silv 56 FC solder on his joints while flowing with nitrogen. (Remember, most of the time, flux-coated rods are for dissimilar metals.) When using solder rings WITHOUT flowing nitrogen, Tim starts off by using the Hilmor swage tool. He then uses the Sil-Fos solder rings. Some scale developed inside the pumping without nitrogen. When Tim uses solder rings WITH nitrogen, no scale forms on the inside of the piping. However, exceptionally hot tubing can also contribute to flake formation. Tim also shows us his port setup. A final word of caution: solder rings may slip and fall down into the joint if they get too hot. Read all the tech tips, take the quizzes, and find our handy calculators at https://www.hvacrschool.com/.

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HVAC School

432K subscribers