Chapter 23 Flashcards
Alloy
adhesion connection is made with a minimum of ________ (bronze) which melts above 800 degrees Fahrenheit and flows by capillary motion between close-fitting metal.
Brazing
the bonding (adhesion), rather than fusing (melting), of two metal objects. Basic brazing techniques are used such as overlap and fillet joints.
Bronze
adhesion connection is made with a minimum of alloy (________) which melts above 800 degrees Fahrenheit and flows by capillary motion between close-fitting metal.
Bronze Filler rods
come in different sizes and have a lower melting point than the metal being bonded depending on their alloy composition.
* Silicon bronze is used for copper sheet and mild steel.
* Nickel bronze is used for mild steel, cast iron, and wrought iron.
Fillet joint
(Braze Welding)
o Set up the two pieces of sheet metal at right angles.
o Using the proper gas pressure and flame adjustment, “tin” the joint.
o After “tinning,” go back over the joint with a non-fluxed filler rod to smooth the joint.
Flux
required for bronze or brass brazing is usually a borax type consisting of sodium borate with other additives. (Flux is any substance or mixture used to promote the fusion of metals or minerals,
for example, alkalis, borax, lime, fluorite, etc.)
* removes all oxides from the metal surfaces to be welded.
* forms a protective coating over the heated metal surfaces that prevents oxidation.
* floats the oxides and their impurities with which it combines to the top of the molten metal.
Fusing
(melting)
Overlap joint
(Brazing)
o Overlap two pieces of sheet metal by approximately 1/4 inch.
o Using the proper gas pressure and flame adjustment, “tin” the joint.
o After “tinning,” go back over the joint with a non-fluxed filler rod to smooth the joint.
Oxides
Flux removes all _______ from the metal surfaces to be welded.
Tin/Tinning
Heat the area on the metal to be bonded to a cherry red color and “_____” it by applying a light coating of fluxed filler rod
Oxidation
the combining of oxygen with any other substance
o When oxygen slowly combines with a substance
adhesion connection is made with a minimum of ________ (bronze) which melts above 800 degrees Fahrenheit and flows by capillary motion between close-fitting metal.
Alloy
the bonding (adhesion), rather than fusing (melting), of two metal objects. Basic brazing techniques are used such as overlap and fillet joints.
Brazing
adhesion connection is made with a minimum of alloy (________) which melts above 800 degrees Fahrenheit and flows by capillary motion between close-fitting metal.
Bronze
come in different sizes and have a lower melting point than the metal being bonded depending on their alloy composition.
* Silicon bronze is used for copper sheet and mild steel.
* Nickel bronze is used for mild steel, cast iron, and wrought iron.
Bronze Filler rods
