Week 1 Flashcards
What is a mix of two or more elements in a metal called
Alloy
What element determines the basic properties of steel
Iron
Stainless steels are defined by the presence of what?
Chromium
The ability of a metal to resist penetration is called?
Hardness
Ability of a metal to be stretched into a thin wire?
Ductility
ASTM specification for steel products starts with the letter A, is what?
Ferrous
What does metal do when it is heated?
Expands
Give 4 different ways to identify a metal bar
Chip test, spark test, appearance test, magnetic test
What are the 5 basic weld joints
Butt, corner, edge, lap, T
One of the major difference between gas fusion welding and brazing is that in brazing
The base metal is not melted
Which of the following are distinguishing features of a carburizing flame?
2 inner flame cones and an outer blue envelope
What’s an oxy acetylene flame in order from coldest to hottest
Carburizing
Neutral
Oxidizing
When the edges of two pieces of metal are heated until they flow together is called?
Fusion welding
To move a pressurized cylinder short distances it can be?
Placed on a cylinder cart
What serious condition is indicated when a torch emits a loud and shrill hissing sound
Flashback
What are bits of slag, flux, oxides, or dirts trapped in a weld
Inclusions
What metal would produce the most hazardous fumes
Galvanized
What is oxy acetylene cutting confined to
Ferrous metals
When storing oxygen and acetylene cylinders they can…
Not be stored together at all
If you believe you have a problem with your oxygen regulator, you will
Replace the regulator or have it repaired by a qualified person
The thicker the metal the smaller the oriffice required for welding? T/F
False
Use of grease or oil on oxy acetylene equipment can cause and explosion? T/F
True
The higher the carbon content in steel, the lower the melting point
True
When installing a regulator on a gas cylinder, cracking means what?
Opening the valve slightly and then closing it before installing a regulator
In a workshop you should assume all tooling is hot?
True
Acetylene tanks have special right hand threads? T/F
False
You may use a flame to check for leaks on a regulator or hoses? T/F
False
Quenching is a process of cooling a metal slowly? T/F
False
An edge joint is considered one of the strongest welding joints? T/F
False
The standards for proper ventilation is set by cal fed? T/F
False
The cooling rate of metal is a factor of heat treatment of steel? T/F
True
The last two numbers of the AISI indicate chemical composition? T/F
False
What is the basic principle of oxy acetylene flame cutting?
A chemical reaction process called oxidation
The point where the weld plate meets the base metal is called
The toe
Oxygen with a regulator can be used in or with
None of the both
In an oxy acetylene cutting operation. One of the many safety hazards is the
All the above
Low carbon steel is harder than high carbon steel
False
The metallurgical composition of the filler and the ___ ____ should be close to the same metals
Base metal
What do we call a metal that is harder than a file, what is its brinell hardness number
600+ BHN
Welding equipment should be operated in a well ___ area
Ventilated
How is the density of metal measured
Weight
When oxy acetylene cutting is performed, excessive slag is a result of
Cutting speed too slow
The cutting action takes place when ___ comes in contact with the red molten metal
Oxygen
What is the minimum shade lens?
5
Identify welding symbol,
Other side
Arrow side
How long the weld is
Pitch
Drawing a side view and overhead view
What process
Arrow side is the bottom
Other side is the top
Fillet is triangle with straight side on left
Weld length is after the fillet symbol
Concave is a U, flat is a line
Pitch is the distance between each weld from center to center
OAW is oxy acetylene process
Explain safety procedure for preparing and doing an oxy acetylene cutting operation, 1-18
- Make Prework safety plan
- Make a JHA
- Get an ok to work or clearance
- Fill out an hot work permit
- Get a fire watch
- Gather PPE and fire extinguisher
- Clear area of flammable debris
- Protect equipment from possible damage
- Clean and inspect cylinders from proper operation
- Check cylinder gauges for sufficient gas pressure
- Inspect the torch for proper operation
- Clean torch tip
- Light the torch
- Safely make a cut, be aware of personnel and equipment
- Mark materials as hot
- Safely dispose of materials
- Check area for possible fires
- Sign off hot work permit, notify operations, file JHA
