Oxy-Fuel Welding and Brazing: Torch Types, Flames, Joints, Temperatures, Tank Sizes, and Exam Prep

Flashcards covering brazing and soldering fundamentals: torch types, flame types, joint methods, temperatures, regulator settings, silver content in brazing rods, copper melting point, and common gas cylinder sizes.

What are the two most common torch types used for brazing?

Oxy-acetylene and air-acetylene.

Name the three torch types commonly used for soldering.

Propane, natural gas, and acetylene.

Among the torches M, L, and K, which has the thickest walls?

K.

Among the torches M, L, and K, which has the thinnest walls?

M.

What color is the writing on the K torch?

Green.

What color is the writing on the M torch?

Red.

What is the mnemonic used to remember the relative sizes and colors of M, L, and K torches?

Small (M) = red, middle (L) = blue, large (K) = green.

Which two torch types are typically used for air conditioning refrigeration?

K and L.

What are two common pipe joints mentioned besides flare and swage?

Crimping and brazed joints (raised joint using a fitting).

What do you call the process used to soften copper so it can be bent, flared, or swedged?

Annealing.

Name two valid joints you can make to connect two pieces of pipe.

Compression joints and brazed joints.

How do you differentiate between soft soldering and brazing in terms of temperature?

Around 840°F (the cutoff between soft soldering and brazing).

What regulator pressure should an air-acetylene setup be set to?

About 14-15 psi.

What is the typical silver content range in brazing rods?

About 5\% to 56\% silver.

What silver content is commonly seen in brazing rods in the field?

About 15\% silver.

At what temperature does copper melt?

Approximately 1900°F.

What is the approximate flame temperature of an oxy-acetylene torch?

Around 5400°F.

What is the approximate flame temperature of an air-acetylene (aero) torch?

Around 3000°F.

What is the brazing temperature range in Fahrenheit?

Approximately 1100-1600°F.

What is the neutral flame?

A flame with a one-to-one ratio of oxygen to acetylene.

Which flame has more acetylene than oxygen?

The carburizing (fuel-rich) flame.

Which flame has more oxygen than acetylene?

The oxidizing flame.

What is the typical oxygen tank size and its name?

R tank, about 20 cubic feet.

What is the usually smaller acetylene tank called and its typical capacity?

MC tank, about 10 cubic feet.

What acetylene tank size around 40 cubic feet is mentioned, and what is its name?

E tank (also B tank is 40 cubic feet).