Gas Welding(SB-5)

Question 1

Which factor should you consider when considering gas welding?

Answer 1

All of the above

Question 2

From what special type of alloy(s) are welding tips made?

Answer 2

Copper

Question 3

From what special type of alloy(s) are welding tips made?

Answer 3

1 psig or less

Question 4

What device(s) control(s) the volume of oxygen and fuel-gas burned at the torch tip?

Answer 4

Two needle valves at the torch mixing head

Question 5

In a low-pressure welding torch, the fuel-gas enters as a result of suction created in the torch by a jet of higher-pressure _____.

Answer 5

oxygen

Question 6

(True or False) In a medium-pressure welding torch, the working pressure of oxygen and
fuel-gas is equal.

Answer 6

true

Question 7

What primary function do filler rods serve in oxygas welding?

Answer 7

As a source of metal to fill the weld joint

Question 8

The copper coating on steel filler rods enables the rods to _____.

Answer 8

resist corrosion during storage

Question 9

Which factor determines the proper diameter of filler rod to use for gas welding two steel plates?

Answer 9

thickness of the metal

Question 10

Which factor determines the type of filler rods to use in oxygas welding?

Answer 10

Specifications of the metal being joined

Question 11

(True or False) Welding tip sizes are standardized among manufacturers.

Answer 11

false

Question 12

What mistake have you most likely made when you have difficulty controlling the melting of the welding rod, the welds are being made too fast, and their appearance and quality areunsatisfactory?

Answer 12

welding tip too large

Question 13

What factor dictates the adjustment you must make to the flame after igniting a welding
torch?

Answer 13

type of metal welded

Question 14

What type of flame is best used for welding high-carbon steels, nonferrous metals, and
hardfacing?

Answer 14

carburizing

Question 15

What type of flame is correct for use on most metals?

Answer 15

neutral

Question 16

What flame is limited in use and harmful to many metals?

Answer 16

oxidizing

Question 17

What is the first corrective step you should take when needle valves fail to shut off when
hand tightened in the usual manner?

Answer 17

Open the valve and using the working gas pressure blow out any foreign matter.

Question 18

When there is a leak around the torch valve stem, you should tighten the packing nut or
repack it if necessary. For repacking, NEVER use oil. Instead, you should use only _____.

Answer 18

the packing recommended by the manufacturer

Question 19

You must remove deposits of _____ regularly to ensure good performance of welding tips.

Answer 19

slag and carbon

Question 20

What procedure should you follow to recondition the end of a torch tip that has become rough and pitted?

Answer 20

Place emery cloth, grit side up, on a flat surface and rub the tip end over it until the tip is
back to its original condition.

Question 21

What type of file is commonly used to recondition a welding tip?

Answer 21

mill

Question 22

When forehand welding, you point the flame in the direction of travel and hold the tip at
about a _____ angle.

Answer 22

45 degree

Question 23

The forehand method is best for welding _____.

Answer 23

sheet and light plate up to 1/8 of an inch thick

Question 24

When backhand welding, you point the flame away from the direction of travel and hold the
tip at about a _____ angle.

Answer 24

60

Question 25

For which of the following reasons should you use the backhand method instead of the forehand method when welding plates thicker than 1/8 inch?

Answer 25

All of the above

Question 26

For which reason is it possible to weld steel plates faster by using the backhand technique and a reducing flame rather than the forehand technique and a neutral flame?

Answer 26

All of the above

Question 27

Which factor is an advantage of using multilayer welding instead of single layer when welding thick plate and pipe?

Answer 27

All of the above

Question 28

(True or False) Sheet metal melts easily and does not require special edge preparation.

Answer 28

true

Question 29

On what thickness of plate do you begin to make a slight root opening between the parts to get complete penetration?

Answer 29

3/16 to 1/4 inch

Question 30

What size plate requires beveled edges 30 degrees to 45 degrees and a root opening of 1/16 inch?

Answer 30

1/4 inch+

Question 31

What action must you take to relieve stresses developed when oxygas welding low-alloy steels?

Answer 31

Heat-treat before and after welding

Question 32

What causes the surface of the molten puddle to appear greasy when welding wrought iron?

Answer 32

Slag used in manufacturing the wrought iron

Question 33

(True or False) When you oxygas weld cast iron, you must preheat the entire weldment to between 750°F and 900°F. After completing the weld, you must postheat the weldment to between 1100°F to 1150°F to relieve stresses.

Answer 33

true

Question 34

Which characteristics apply to the method of joining a light stainless steel sheet by oxygas welding?

Answer 34

Flux, a carburizing flame, no puddle, and a relatively small torch tip

Question 35

To what temperature range should you preheat the joint area when you oxygas weld deoxidized copper?

Answer 35

500-800

Question 36

Assuming the same welding process and same part thickness, compared with the technique for joining steel parts, the technique for joining deoxidized copper calls for the use of a/an _____.

Answer 36

larger torch tip and more preheating

Question 37

What type of rod is used for welding brass by the oxygas process?

Answer 37

silicon copper

Question 38

Which action should you take when oxygas welding copper-nickel alloys?

Answer 38

adjust the flame to a slightly oxidizing flame.

Question 39

You must wear a respirator to guard against poisonous fumes when you weld _____.

Answer 39

lead

Question 40

What type of welding rod should you use to minimize cracking when gas welding wrought aluminum alloys?

Answer 40

4043

Question 41

Pure aluminum is one fourth as strong as _____.

Answer 41

steel

Question 42

For which reason do you use a flux when welding aluminum alloy?

Answer 42

To remove the aluminum oxide formed during the welding process

Question 43

Edge notching is a recommended procedure for oxygas butt welding aluminum plate because it _____.

Answer 43

aids in getting full penetration and prevents distortion

Question 44

What temperature should you not exceed when preheating aluminum alloys?

Answer 44

700

Question 45

(True or False) The forehand method of welding is preferred for aluminum alloys.

Answer 45

true

Question 46

What action should you take to reduce the possibility of heat-treatable aluminum alloys cracking during the welding process?

Answer 46

all of the above

Question 47

Which requirement must be met to complete a successful weld when oxygas welding pipe?

Answer 47

all of the above

Question 48

(True or False) For welding pipe, the backhand technique is preferred because it produces faster melting of the base metal surfaces, allows a smaller bevel to be used, and results in a savings of 20% to 30% in welding time, rods, and gases.

Answer 48

true