Soldering & Brazing ALWAYS USE LEAD FREE SOLDER!!!!
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Transcript of Soldering & Brazing ALWAYS USE LEAD FREE SOLDER!!!!
Soldering & Brazing
ALWAYS USE LEAD FREE SOLDER!!!!
Soldering
• Soldering: process in which two or more metal items are joined together by a melting and flowing a filler metal, solder below 842*F, into the joint.
• The filler metal has a lower melting point than the adjoining metal.
• Soldering differs from welding in that soldering does not involve melting the work pieces.
Soldering Applications• Plumbing, electronics, and metalwork • Commonly used in repairs & joining of dissimilar metals • Plumbing: Soldering provides reasonably permanent but
reversible connections between copper pipes in plumbing systems
• Electronics: soldering connects electrical wiring and electronic components to printed circuit boards (PCBs).
• Metalwork: Jewelry repair, sheet metal objects such as food cans, roof flashing, rain gutters.
• Used to seal & repair automobile radiators.• Small mechanical parts are often soldered or brazed as well. • Soldering is also used to join copper foil in stained glass work.
Applications
Advantages of Soldering• Low power & temperature• Easily automated process• Dissimilar materials may be joined (cast iron & steel)• Thin material parts may be joined• Moderate skill level
Disadvantages of Soldering
• Careful removal of the flux residuals is required in order to prevent corrosion;
• Large sections cannot be joined• Fluxes may contain toxic components• Soldered joints cant be used in high temperature applications
• Low strength of joints.
Soldering Equipment
• Guns, irons, torches, filler
Electrical Soldering Video
• Electrical soldering (4:46)– https://www.youtube.com/watch?v=BLfXXRfRIzY
• Procedure– Clean soldering iron tip– Allow iron to heat up – Apply small amount of ROSIN core solder to tip– Heat wire– Apply Solder– Unplug soldering iron
Torch Soldering Video
• Torch Soldering Video– https://www.youtube.com/watch?v=WpHQ0WCDlFI
• PROCEDURE– Cut pipes to size– Clean or all fittings with wire brush or sand paper– Apply flux to ALL joints– Heat metal– Apply solder (1” pipe = 1” solder)
Brazing / Braze Welding
• Brazing: high temperature soldering (above 842*F)• Flux coated bronze or brass filler rod used to join work pieces
• The base metal does not melt.
In the past, nearly all solders contained lead, but environmental concerns have increasingly dictated use of lead-free alloys for electronics and plumbing purposes
Advantages of Brazing
• It's easy to learn.• You can join virtually any dissimilar metals.• Repair cast iron• The bond line can be very neat in appearance.• Joint strength is strong enough for most non-
heavy-duty use applications
Disadvantages of Brazing• A poor joint/weak joint may be hard to identify• Long-term effects of dissimilar metals • Filler color may differ from base metal• Low melting point…brazed parts may not be used in high temperature applications. (e.g. exhaust manifold)
Brazing Video
• Brazing Video (8 minutes)– https://www.youtube.com/watch?v=0fly4f0STGw
• Procedure – Thoroughly clean metal– Evenly preheat metal – Apply brazing rod to metal– Air cool– Remove glass slag