TPC 418 Gas Welding Process

Question 1

In oxy fuel welding, you can control the rate of heat input to the base metal by varying the

Angle of the torch
Dipping of the Filler rod
Setting of the gas regulator
Speed of the torch

Answer 1

Speed of the torch 

Question 2

In torch brazing, the filler metal is distributed in the joint as a result of

Capillary action
Gravity
Heat
Pressure

Answer 2

Capillary action

Question 3

The purpose of using a flux in welding and brazing is to

Clean the base metal
Lower the melting point of the filler metal
Lubricate the joint
Prevent the base metal from melting

Answer 3

Clean the base metal

Question 4

The purpose of postheating is two

Eliminate the need for a flux
Lower the welding temperature
Reduce stresses in the welded structure
Speed up the welding process

Answer 4

Reduce stresses in the welding structure

Question 5

When you weld low-carbon steel, you should

Dip the filler rod into the weld puddle
Keep the flame well away from the weld puddle
Use a flux
Use an oxidizing flame

Answer 5

Dip the filler rod into the weld puddle

Question 6

When welding aluminum, you need to remember that aluminum

Begins to glow just before it melts
Conducts heat away from the weld site rapidly
Does not require preheating or post heating
Melts at a higher temperature than most metals

Answer 6

Conducts heat away from the weld site rapidly

Question 7

In preparing aluminum parts for welding, you should______ the surfaces to be welded

Burnish
Grease or oil
Scrape or file
Use carbon tetrachloride to clean

Answer 7

Scrape or file

Question 8

When welding brass, you should use a

Copper filler rod
Flux
Reducing flame
Zinc, filler rod

Answer 8

Flux 

Question 9

What kind of flame should be used when welding lead?______nickel? _______Magnesium.?_______

Carburizing; Neutral; neutral
Neutral; carburizing; carburizing
Oxidizing; carburizing; neutral
Oxidizing; oxidizing; carburizing

Answer 9

Nutral; carburizing; carburizing

Question 10

To make the best possible welds using oxyfuel equipment, you should

Know what metals you are joining
Move the filler rod in and out of the flame
Quench the welded part it in water immediately
Use a neutral flame unless directed otherwise

Answer 10

Know what metals you are joining

Question 11

Oxyfuel welding and oxygen cutting are alike in that both processes

Produce a kerf
Require lighting the torch with a sparklighter
Result in combustion of the base metal
Use a torch that delivers a stream of oxygen

Answer 11

Require lighting the torch with a sparklighter

Question 12

Which of the following must be worn during an oxygen cutting operation?

Face shield
Goggles with dark lenses
Leggings
Skull cap

Answer 12

Goggles with dark lenses 

Question 13

When piercing a steel plate with an oxygen cutting torch, which step should be performed first?

Blow the slag away from you
Cut a kerf from the edge to the spot
Heat the spot to a bright red
Open the cutting oxygen valve

Answer 13

Heat the spot to a bright red

Question 14

The purpose of scarfing is to

Create a groove in a metal piece
Pierce a hole in a metal sheet
Remove a surface defect from unfinished steel
Remove excess metal from a casting

Answer 14

Remove a surface defect from unfinished steel

Question 15

If you need to cut a metal other than mild steel or medium carbon steel, you might make it difficult job easier if you

Decrease the amount of preheating
Lay a bead of low-carbon steel along the cut line
Make a cut in short segments
Use a helper with a second torch

Answer 15

Lay a bead of low-carbon steel along the cut line

Question 16

The oxyfuel process in which the base metal is not melted and the filler metal is drawn into a thin joint by capillary action is called

Braze welding
Brazing
Fusion welding
Turning

Answer 16

Brazing

Question 17

The purpose of using a flux in brazing is to

Control the flow of the filler metal
Eliminate oxides from the metal surfaces
Lower the melting point of the base metal
Protect the surface of the metal after brazing

Answer 17

Eliminate oxides from the metal surfaces

Question 18

A special concern when brazing ______ is that the filler metal melts at a temperature very near the melting point of the base metal

Aluminum
Cast-iron
Malleable iron
Stainless steel

Answer 18

Aluminum

Question 19

When brazing and braze welding, which of the following safety precautions must you observe?

Avoid skin contact with the flux
Do not create sparks in the area
Seal chemical containers before working on them
Wear a full face shield

Answer 19

Avoid skin contact with the flux

Question 20

Soldering differs from brazing in that soldering

Does not require melting the base metal
Occurs at higher temperatures
Occurs at lower temperatures
Requires melting the base metal

Answer 20

Occurs at lower temperatures

Question 21

What is the purpose of hard face welding? What is the purpose of thermal spraying?

Apply a surface coating; join flat surfaces
Apply a surface coding; rebuild worn areas
Join flat surfaces; rebuild areas
Rebuild worn areas; apply a surface coating

Answer 21

Rebuild Worn areas; apply a surface coating

Question 22

In torch hard facing, the new material melts______ the surface. In Flame spraying, the new material melts _________the surface.

After it is placed on; after it is placed on
After it is placed on; before it reaches
Before it reaches; after it is placed on
Before it reaches; before it reaches

Answer 22

Before it reaches; before it reaches

Question 23

Which of the following is a common surfacing material?

Carbon
Ceramics
Glass
Thermoplastics

Answer 23

Ceramics

Question 24

When using thermal spraying for Shaft repair, which step should be performed first?

Cleaning
Machining
Surfacing
Undercoating

Answer 24

Machining

Question 25

Electric arc spring operations require eye protection with a lens shade number of

1 to 3
1 to 5
6 to 8
9 to 10

Answer 25

9 to 10