Its Getting Hot in Here
What is the melting point for wrought iron in celsius?
1510 °C (pg.8)
Definition of Upset?
To make shorter or thicker (pg.21)
The ore source for Aluminum is?
Bauxite ore (pg.66)
Increased weld metal temperature can lead to issues that include?
Dilution, distortion, hot cracking, grain growth, mechanical properties (pg.44)
Degreasing agents, machining fluids, and cutting fluids should be?
Halogen-free (pg.64)
What diagram represents the relationship between temperature, structure transformation, and chemistry of different steels?
Phase diagram or Equilibrium diagram (pg.23)
Definition of Metastable?
A relatively unstable, transient, but significant state or condition of a chemical or physical system (pg.19)
How many steps does it take to process Aluminum?
10 (pg.66-68)
When fabricating metals, the surfaces may be in contact with certain contaminants that can cause porosity. These are?
Oil, grease, paint, and oxides (pg.43)
Metals are normally found in the solid state except this one metal?
Mercury [Hg] (pg.22)
At which temperature does common structural steels turn from BCC to FCC?
910 °C or 1670 °F (pg.23)
Definition of Dilution?
The change in composition of the weld metal caused by the mixing of the base metal or the previously deposited weld metal (pg.17)
The cracking of aluminum alloys is primarilly due to what?
The hot shortness of the alloy (pg.78)
Carbon steel is most susceptible to what?
oxidation (rust) [pg.44]
Distortion (strain) can be an issue that arises from what actions?
The thermal expansion and contraction of the weld metal and parent metal as it isheated and cooled (pg.46)
When a steel is heated sufficiently to cause the structure to transform, new grains grow through a process called?
Recrystallization (pg.30)
Definition of Pearlite?
A lamellar (layered) microstructure of steel comprised of a mixture of ferrite and cementite (pg.19)
The melting point of the oxide on the aluminum surface is "_" times greater than the melting point of the metal
3 (pg.70)
Duplex stainless-steel microstructure is a mixture of what grains?
Austenite and ferrite grains (pg.60)
Eutectic point/stage can also be referred as?
Mushy stage/Metastable stage (pg.25)
For martensitic stainless steels with >0.50 carbon content, what is the typical preheat procedure?
Preheat at 250 °C (482 °F); high heat input, immediate post-weld anneal (pg.60 table 16)
Definition of Coke?
The residue left from the distillation (heating without air) of coal, which is used as fuel in the steel making process to remove oxygen and provide the heat source for the breakdown of the iron ore (pg.16)
The primary casting processes for aluminum are?
Die casting, Permanent mould casting, and Sand casting (pg.69)
The addition of alloying elements in steel increases the strength and hardness because?
The atoms of these elements help to block dislocation movement in the materials microstructure (pg.47)
To limit the amount of grain growth you must?
follow the requirements of the welding procedure
weld within the specified range of current, voltage, and welding speed
(pg.58)