Aluminum is not commonly used as a brazing filler metal due to its high melting point and poor flow characteristics.

Flux serves multiple purposes in brazing, including removing oxides from the base metal, preventing the formation of oxides during brazing, and increasing the fluidity of the molten filler metal.

Oxy-acetylene torches, propane torches, and butane torches are all commonly used for brazing.

Preheating the base metal before brazing helps to reduce thermal shock and improve the flow of the molten filler metal.

Butt joints, edge joints, lap joints, and T-joints are all common types of brazing joints.

Brazing typically involves lower melting temperatures than welding, which can be beneficial for joining dissimilar metals or materials that are sensitive to heat.

Silver-copper, copper-phosphorus, and nickel-silver are all common types of brazing alloys.

Pickling is the process of removing excess flux from a brazed joint using a chemical solution.

Fluoride is not commonly used as a brazing flux due to its corrosive nature.

Brazing is the process of joining two pieces of metal using a molten filler metal that has a lower melting point than the base metal.

Wire, rod, sheet, and paste are all common types of brazing preforms.

Postheating is the process of heating a brazed joint to a temperature above the melting point of the filler metal to improve the strength and ductility of the joint.

Air is not commonly used as a brazing atmosphere due to its high oxygen content, which can lead to oxidation of the base metal.

Degreasing is the process of cleaning the base metal prior to brazing to remove any dirt, grease, or oil that could interfere with the brazing process.

Resistance brazing machines are not commonly used for brazing, as they are typically used for welding.