do better next time
the optimum preheat temp for martensitic stainless steel is
250*c
PG59
dilution must be kept very low to minimize the pickup of
carbon
PG 39
gray cast iron has a preheat range of?
20-300*C or 68-572*F
PG38
once grain growth occurs it can not?
be reversed
PG58
what is the thermal conductivity of 304 stainless in BTU
9.4
PG46
basis temper designation T6 means what
solution heat treated and then artificially aged]
pg 75
what is the process to be used in FIG 56
SMAW
PG56
Nickle in the solid state dose not have a high suitability for
CARBON
PG 40
in AA alloy series 7XXX what is the major alloying elements
Zink and magnesium
pg 73
corrosion, oil/grease or other material contaminant's
PG 41
how long is the piece held / soaked at the required temperature above the recrystallization
1 hour per 25mm or 1 inch of thickness
PG 84
what are the elements in ORE
list all 3
feO
FE
O2
PG 19
to anneal castings to the O temper they must be heat treated to what temp
316-343*C or 600-649*F
PG 77
what is the ultimate MPA of permanent castings
228
PG 69
low carbon types of austenitic stainless steel 304L, 316L and 317L have a max carbon content of.....
.003%
pg 55
heat treatment refers to the controlled heating and cooling of metal to obtain desired mechanical properties such as
list all 45
ductility, toughness, hardness, brittleness, machinability.
PG 81
well-dried SAW fluxes produce a minimal amount of what in the weld pool
hydrogen
PG 83
when steel is hot rolled mill scale it typically forms a layer
DOUBLE OR NOTHING!!!!
mill scale tends to do what when the thickness of base material increases
iron oxides that is 0.1mm or 0.0039 inches thick
mill scale will get thicker as base metal thickens
PG 81
when annealing cooling is used this produces a
coarser grain structure of pearlite with lower toughness and lower hardness
PG 85
vibratory stress relief is applied during welding to...
control distortion, reduce stress build up, reduce consequent cracking.
PG87
aluminum-copper alloy of 4.5% copper to a temp of 510*C or 950*F for a period of 1 hour causes it to
go into a solid solution
PG90
filler alloy composition plays an important role with respect to avoid what
weld bead cracking
PG78
Sulphur in the material can form liquid films at the grain boundaries which
pulls apart during working
PG 78
after about 1 to 2 years in ambient tempertature AA 6061 T1 will become
stronger and less ductile
PG 74
what is the temperature for the heat treatment process "spheroidizing"
675*C
answer doesn't have to be on the dot with in 25+/25-
PG82