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Auto > Chapter 17 Welding Theory > Flashcards

Chapter 17 Welding Theory Flashcards

1
Q

A(n) … flame has a balance of fuel gas and oxygen. It is the most commonly used flame because it adds nothing to the weld metal.

A

neutral

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2
Q

Gauges that read “0” (zero) pressure when the pressure is released, or those that have a damaged glass or case, must be repaired or replaced.

A

True

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3
Q

A () works by holding the forces on both sides of a diaphragm in balance.

A

regulator

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4
Q

A () will stop both reverse gas flow and the flame of a flashback.

A

flashback arrestor

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5
Q

The regulator pressure-adjusting screw should be backed off each time the oxyfuel system is being shut down.

A

true

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6
Q

The purpose of the () valve is to prevent gases from accidentally flowing out of one hose through the torch body and then into the other hose.

A

reverse flow

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7
Q

High-pressure valve seats that leak result in a(n) () or rising pressure on the working side of the regulator

A

creep

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8
Q

A regulator that is left pressurized causes the diaphragm to stretch, the () to straighten, and the adjusting spring to compress

A

bourdon

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9
Q

A(n) () flame has an excess of oxygen. This flame has the highest temperature and may put oxides in the weld metal.

A

oxidizing

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10
Q

Rupture disk safety devices are one-time-use devices

A

true

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11
Q

A(n) () occurs when the flame burns back inside the tip, torch, hose or regulator.

A

flashback

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12
Q

The working pressure of a gauge is always a little less than the torch tip pressure due to some line drop

A

True

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13
Q

Internal and external moving parts on a regulator or a gauge DO NOT require oiling

A

True

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14
Q

A flashback that reaches the cylinder may cause a fire or an explosion

A

True

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15
Q

The () pressure gauge shows the regulated pressure being controlled for the torch

A

Working

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16
Q

Leak-detecting solution must be free flowing so that it can seep into small joints, cracks and other areas that may have a leak.

A

True

17
Q

All oxyfuel processes use a high-heat, high-temperature flame produced by burning a fuel gas mixed with carbon dioxide

A

False

18
Q

Acetylene is the most widely used fuel gas because of its high temperature and concentrated flame.

A

True

19
Q

A(n) () is made up of a small ball held tightly against a seat by a spring

A

safety release valve

19
Q

A(n) () occurs when a flame goes out with a loud snap or pop

A

backfire

20
Q

The () hand torch is the most common type of oxyfuel gas torch used for welding and cutting

A

oxyacetylene

21
Q

A(n) () is the only safe device to use when lighting any torch.

A

Spark lighter

22
Q

Dedicated cutting torches are usually shorter than combination torches.

A

False

23
Q

A(n) () is a thin piece of metal held between two seals

A

safety disc

24
Q

A(n) () flame has an excess of fuel gas. This flame has the lowest temperature and may put extra carbon in the weld metal

A

carburizing

25
Q

Why is acetylene the most popular fuel gas used for oxyfuel welding

A

Acetylene is the most widely used fuel gas because of its high temperature and concentrated flame.

26
Q

What do pressure regulators do?

A

All pressure regulators reduce the high cylinder or system pressure to the proper lower working pressure.

27
Q

List 5 various types of pressure regulators.

A

low-pressure regulators, high-pressure regulators, single-stage regulators, dual-stage regulators, cylinder regulators

28
Q

Why are two-stage regulators used sometimes and not a single-stage regulator.

A

Because some small single-stage pressure regulators have difficulty maintaining the proper working pressure under high flow rates. Two-stage regulators have two sets of springs, diaphragms, and valves. A two-stage regulator does not require periodic readjustments and offers consistent supply pressure.

29
Q

Why is the pressure at the torch tip always lower than the pressure shown on the working pressure gauge?

A

The torch tip pressure is always a little less than the working pressure due to some line drop.

30
Q

Why should the regulator pressure adjusting screw be backed off each time the oxyfuel system is being shouting shut down?

A

This is done to release the spring and diaphragm pressures, which, over time, may cause damage.

31
Q

Why do gas cylinders have different designs fittings?

A

A gas cylinder has fittings because there is a variety of different designs for various types of gases to ensure that regulators cannot be connected to the wrong gas or pressure,

32
Q

Why is it unsafe to use oil on a regulator?

A

Oiling a regulator is unsafe and may cause a fire or an explosion.

33
Q

What is the advantage of using a combination welding and cutting torch?

A

The combination welding and cutting torch offers more flexibility because a cutting head, welding tip, brazing tip, or heating tips can be attached to the same torch body

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