Exam 19: Soldering, Brazing, and Braze Welding Processes

The only difference between soldering and brazing is that brazing is done at a lower temperature, below 840 degrees F (449 degrees C), and soldering is done at a higher temperature, above 840 degrees F (449 degrees C).

Brazing uses more filler metal than braze welding.

Using excessive flux in a joint may result in flux being trapped in the joint, weakening the joint, or causing the joint to leak or fail.

The ____ of a brazed joint is its ability to withstand a force parallel to the joint.

____ of a joint is its ability to bend without failing.

With the ____________________ method, the prefluxed parts are immersed in a bath of molten solder or braze metal, which is protected by a cover of molten flux.

The ____ method of heating uses an electric current that is passed through the part.

____ of a joint is its ability to resist chemical attack.

____ solders are most commonly used on electrical connections, air-conditioning and refrigeration drain piping, and for architectural accents where good corrosion resistance is needed. They must never be used for water piping.

A(n) ____________________ is the temperature range in which a metal is partly solid and partly liquid as it is heated or cooled.

If fluxes become overheated or burned, they will stop working as fluxes, and become a contamination in the joint.

The ____________________ method uses high-frequency sound waves to produce the bond or to aid with heat in the bonding.

Braze welding uses capillary action to pull filler metal into a tightly fitted joint.

Because soldering and brazing are similar processes, both are classified by the American Welding Society (AWS) as ____________________.

____ solder alloys have excellent wetting, flow, and strength characteristics, but they are expensive.

The oxyacetylene flame has a very high temperature near the inner cone, but it has little heat in the outer flame.

The use of fluxes eliminates the need for good joint cleaning.

The ____ method of heating uses a high-frequency electrical current to establish a corresponding current on the surface of the part.

One function of fluxes is to remove any oxides that form as a result of heating the parts.

____ alloys are the most popular brazing alloys.They are available as regular and low-fuming alloys.