Exam 20: Soldering and Brazing

The process of using heat to soften metal so it can be bent or formed has been used ____.

The lower temperature used in ____ does not tend to create hard spots where the base metal becomes hardened.

Soldering and brazing are a weak way of joining or repairing parts.

If galvanized metal is being soldered or if tin-lead solder is being used, additional ventilation should be provided to prevent ____________________ poisoning.

You cannot control the heat for soldering by decreasing the torch angle.

Pretinning parts is an excellent way of assembling small parts when you are working by yourself.

Pennies manufactured before 1982 are solid ____.

You can control the heat for both brazing and soldering by raising and lowering the torch flame.

When brazing beads, some of the signs that the braze metal is being overheated include the bead spreading out over the metal surface, the flux turning black, and/or a white powdery zinc oxide forming alongside of the braze bead.

All metal drill bits have a small flat spot on the tip called the ____________________ .

____________________ is the process of putting a small amount of braze metal on the parts before assembly and then remelting the braze metal to fuse the parts together.

With a(n) ____ joint, the area of the joint is greater than the thickness of the parts being joined.

The application of a surface layer of braze material can be used to add a decorative and durable surface to mild steel.

Always securely clamp metal being drilled because if the drill bit grabs the metal, it will spin around the bit.

Bending with heat produces as accurate a bend as if it were bent in a jig.

____________________ takes place at temperatures below 840 degrees F.

Brazing takes place at temperatures above ____ degrees F.

Overheating can burn off the ____ coating found on many nuts and bolts. Such fumes can be hazardous, so you must avoid breathing these fumes during the brazing process.

____________________ is the force that pulls water up into a paper towel or pulls a liquid into a very fine straw.

In severe cases of overheating, zinc in a brazing alloy may start to burn with a(n) ____ flame.