Guide to soldering
soldering tutorial
Guide to Braze Welding
Brazing Process Fundamentals: How to Braze in Six Steps
Guide to brazing
Guide to Brazing, Braze welding, materials, and soldering
Brazing joins two metals by heating and melting a filler (alloy) that bonds to the two pieces of metal and joins them. Brazing can join dissimilar metals such as aluminum, silver, copper, gold, and nickel.
Soldering is a low-temperature analog to brazing. By the American Welding Society’s definition, soldering takes place with fillers (also known as solders) that melt at below 840°F (450°C). Metals that can be soldered include gold, silver, copper, brass, and iron. The filler melts. When it solidifies, it is bonded to the metal parts and joins them.
Braze welding is the use of a bronze or brass filler rod coated with flux to join steel workpieces.
Terminology in Brazing and Soldering
The phase is the temperature at which bonding takes place between the solid base material and the liquid filler metal
Capillary action is the force that pulls water up into a paper towel or pulls a liquid into a very fine straw
Tensile strength of a joint is its ability to withstand being pulled apart
Shear strength of a joint is its ability to withstand a force parallel to the joint
Ductility of a joint is its ability to bend without failing
Fatigue resistance of a metal is its ability to be bent repeatedly without exceeding its elastic limit and without failure
Corrosion resistance of a joint is its ability to resist chemical attack
A paste range is the temperature range in which a metal is partly solid and partly liquid as it is heated or cooled.
Brazing temperature is the temperature to which the base metal is heated to enable the filler metal to wet the base metal and form a brazed joint.
Fluxes used in brazing and soldering have three major functions:
● They must remove any oxides that form as a result of heating the parts.
● They must promote wetting, which is the phenomenon whereby a liquid filler metal or flux spreads and adheres in a thin, continuous layer on a solid base metal. In soldering the process is often called tinning.
● They should aid in capillary action by pulling the molten alloy into the joint.
Forms:
Fluxes are available in many forms, such as solids, powders, pastes, liquids, sheets, rings, and washers. They are also available mixed with the filler metal, inside the filler metal, or on the outside of the filler metal
Brazing and soldering fluxes will remove light surface oxides, promote wetting, and aid in capillary action. Fluxes will not remove oil, dirt, paint, glues, heavy oxide layers, or other surface contaminants.
Soldering fluxes are chemical compounds such as muriatic acid (dilute hydrochloric acid), sal ammoniac (ammonium chloride), or rosin. Brazing fluxes are chemical compounds such as fluorides, chlorides, boric acids, and alkalies.
These compounds react to dissolve, absorb, or mechanically break up thin surface oxides that are formed as the parts are being heated.
Torch Brazing and Soldering:
Furnace Brazing and Soldering:
Induction Brazing and Soldering
Dip Brazing and Soldering:
Resistance Brazing and Soldering