ESCO Brazing & Soldering

The two most common types of copper tubing are _________ and _________

Soft copper and rigid (hard)

The copper tubing used for air conditioning and refrigeration (ACR) is measured using the __________ diameter

Outer diameter

The types of copper tubing used for air conditioning and refrigeration are _________ and ___________

-Type K

-Type L

-ACR

The small tubing cutters used to cut copper in close quarters are sometimes called a/an _________ tubing cutters

Imp

The most popular choice for refrigerant lines in split-system air conditioners, heat pumps, and mini-split systems is ____________________

Type L soft copper

The tank used for acetylene in portable oxyacetylene kits is typically a(n)_________________

MC" tank (10 cubic feet)

Once copper tube has been cut with a tubing cutter, the end should be_____________

Deburred or reamed

Flaring is the process of expanding the end of a copper tube into a _________ shape

Funnel

A flare tool with a burnishing cone will put a polished finish on the flare and will make a perfect _____ degree flare

45 degree flare

The process of expanding one end of a copper tube so that a tube of the same diameter will slide into the joint, eliminating the need for a fitting, is called _________

Swaging

A system for joining copper tubing that uses a powered tool with interchangeable jaws for different size piping and fittings is called a_________ system

Crimping system

Purging nitrogen through the lines during brazing will displace any oxygen in the tubing and prevent _______ and _______ formation

Oxidation or scale formation

Brazing is a procedure by which tubing is joined by _______________

Melting a filler metal into the joint, bonding it at high temperatures

Air-acetylene torches that are equipped with a pressure regulator and should be adjusted no higher ______________

14-15 psig

When brazing copper to copper, the pressure regulators on the oxygen and acetylene tanks are typically set to produce

1:1 ratio

When brazing, the three most common types of torch flames _______, ________ and ________

Carburizing flame, neutral flame, and oxidizing flame

Soldering, also called sweating, is done at a lower temperature than brazing usually under__________ F.

840

When soldering copper tubing, the filler metal should be melted by the ______________________

Heated copper tubing, not directly by the torch flame

Whichever method is used to join the copper tubing, once assembled the first task that should be performed is _________________________.

A pressurized leak test using an inert gas

To determine the proper test pressure that should be used to test a system for leaks, the system component data plates should be referenced and ___________________

The lowest of all the listed pressure should be used

An ultrasonic leak detector, micro foam solution, or a trace gas, and an electronic detector can all be used to____________________

Locate a small leak

When working with pressurized nitrogen, the tank should always be equipped with a _________________

Pressure regulator

A system that passes a leak test should be _________________

Evacuated prior to being charged

When brazing or soldering, it is always a good safety practice to have ___________ near the work area

The proper fire extinguisher near the work area

When soldering, what is used to prevent oxides from forming and help the molten solder to flow more easily into the joint?

A Chemical flux

The tank used for oxygen in portable oxyacetylene kits is typically a(n) _______________________

"R" tank (20 cubic feet)

The tank used for an air-acetylene torch is typically a(n); ___________________

“MC or B" tank (40 cubic feet)

When brazing with oxyacetylene, a flame that has slightly more oxygen than acetylene, greater than a 1 :1 ratio of oxygen to acetylene, is called __________ flame

Oxidizing

When brazing with oxyacetylene, a flame that has a 1 :1 ratio of oxygen to acetylene, is called a _________ flame

Neutral flame

On a nitrogen tank regulator, the gauge on the left side displays the _______________

Tank pressure

On a nitrogen tank regulator, the gauge on the right side displays the _____________

Outlet pressure

What is considered a "safe practice" when brazing or soldering copper tubing?

-Bleed the pressure in the torch tanks to 0 psi prior to loading them for transport.

-Ensure there is proper ventilation in work areas where a torch is to be used

As flux is heated, it will ________________

Begin to bubble as the water boils off

If a brazed joint is found to have a defect or leak _______________

The joint can be reheated to correct the defect or the joint must be cut off and a new one made

When a chemical flux is used during brazing or soldering the flux residue ________________

Must be cleaned from the copper tubing once it has cooled

To adjust the amount of heat being applied to the workpiece while soldering or brazing ________________

The distance between the flame and the tubing can be increased or decreased

The gases most commonly used for soldering copper tubing are _______________ and _________________ gas

Propane and Mapp

The gas most commonly used for brazing copper tubing is ____________

Acetylene

One of the most critical tasks performed when brazing is _____________________

Adjusting the torch to produce the proper flame

The maximum flame temperature produce by an oxyacetylene torch is about ___________ degrees Fahrenheit

5400

The maximum flame temperature produce by an air-acetylene torch is about _____________ degrees Fahrenheit

3000

The melting point of copper is approximately ________________ degrees Fahrenheit

1900

Punch, compression, hydraulic, mechanical, and drill-assisted spin bits are all types of ________________

Swage kits

What is the preferred method of joining copper tubing by most mini split system manufacturers?

Flaring

What type of copper has the thickest wall section, is typically used for underground applications, and is marked with green-colored lettering?

Type K copper

What type of copper has the thinnest wall section, is typically used for low-pressure applications, and is marked with red-colored lettering?

Type M copper

The ratings assigned to copper tubing are designated and certified by ______________________

American Society for Testing and Materials, ASTM

When working with ACR copper, the brazing temperatures typically range from ___________________

1100 0 F - 1600 0 F

To change flame size on an air-acetylene torch ___________________

The torch tip needs to be changed