the.com/brazing
Gluing metal with molten metal, because welding seemed too violent and screws too cowardly.
means Joining two pieces of metal by melting a filler metal—often brass or a brass-like alloy—into the joint between them, where it flows in and hardens to bond the parts without melting the parts themselves.
from From "braze," which traces back to the word "brass"—the alloy that gave the technique both its name and its early filler material. "Brass" itself is an old Germanic word (Old English "bræs") of uncertain deeper origin, with no clear cognates elsewhere—one of those metallurgical terms that sat in English from early on without a tidy family tree. The verb sense, "to solder with brass," grew naturally from working that yellow metal, and the related "brazen" (made of brass, hence bold and hard-faced) is a cousin from the same root.
- no melting
- Base metals stay solid; only filler liquefies
- capillary action
- Molten filler crawls into joints against gravity
- hot threshold
- Above 840°F separates brazing from soldering
- ancient craft
- Egyptians brazed gold jewelry 5,000 years ago
- flux required
- Cleans surfaces so metal actually bonds
hvac copper tube joints — residential air conditioning systems use silver braze to join refrigerant lines worldwide
dental gold restorations — tooth-colored crowns and bridges brazed with gold alloy in dental labs for 70+ years