Cutting Chapter 9 Flashcards
What percent carbon , steel develops weak and brittle properties?
Above 1.4 percent
!.4 percent carbon, steel develops weak and brittle properties similar to those of what?
Cast Iron
The AISI and SAE designations are essentially different.
F
What is the only difference between AISI and SAE?
AISI systems sometimes use letter prefix to indicate the manufacturing process that produced the steel.
A
Open hearth steel
B
Acid Bessemer carbon steel
C
Basic open-hearth carbon steel
D
Acid open-hearth carbon steel
E
Electric furnace steel
Nonmagnetic in the annealed condition and nonhardenable by heat treatment.
Austenitic stainless steels
Austenitic steels can be hardened significantly by cold working.
T
Austentic steels can combine ——- —— + ——– ——- with good ——- ——- over a broad ———— ——–
excellent corrosion
heat resistance
mechanical properties
broad temperature range
Austentic stainless steel make up the largest of the 3 common grade stainless steels
T
The force or load applied to a specimen that causes it to deform.
Stress
Maximum tensile stress a material can withstand with out exceeding its elastic limit.
Tensile Strength
Tensile Strength AKA
Yield Strength
Rolled metal
Sheet metal
What is the uniform thickness of sheet metal
less than 3/16 in
U-shaped forms made of 2 flanges connected by a common web.
Channels
The channel C8 X 11.5 is a channel having a normal depth of?
8 inches
The channel C8 X 11.5 has a weight of?
11.5 pounds per foot of length
Most common method of removing surface contamination?
Mechanical cleaning
Tools used for mechanical cleaning include…. 3
Hand Tools
Power Tools
Special Sandblasting Equipment
The welding position is important because some electrodes such as E7024 & E7028, can only be used in the ——– and ———– fillet weld positions
Flat
Horizontal
You can attempt to weld in vertical or overhead positions with electrodes over 3/16 inches.
F except for low hydrogen electrodes
The recommended limitation for low-hydrogen is
5/32 inch
Performed by printing the ASTM number on the material (shape or plate) with an indelible marker or paintstick.
Labeling
involves assigning a color to a base metal type and then spraying that color in the material
Color-coding
Because it is difficult to identify base metal types, most sites have a system to ———- or ——— the various types of metals being used.
Label
Color code
Largest group of stainless steels
Austenitic Stainless Steels
Austenitic Stainless Steels are
nonmagnetic.
Also non magnetic
Nonferrous metals
Manganese Steels
Both hot-rolled and cold-finished carbon steel are milled in —- — —
standard structure shapes
standard structure shapes such as 5
Rods Bars Beams Channels Angles
Has a blue-gray, smooth to scaly surface, but oxidizes to a rough, red brown rust when exposed to weather.
Hot-rolled carbon steel
Has a smooth, gray finish that oxidizes to a fine red brown rust when weathered
Cold-rolled carbon steel
Mass (weight) of a specific volume of metal
Density
Density is aka 2 things
Specific gravity
Specific density
The weight of a metal compared to the weight of an equal volume of water
Specific gravity
Inverse of conductivity
Resistivity
Calculated from its measured resistance to current flow
Electrical conductivity of a metal
The lower the resitivity value, the higher the conductivity value and the more current a metal can carry for it’s size
T
The resistivity of any material increases and it’s conductivity decreases as its temperature….
rises
