effects of heat and heat treatment on metal
The effect of pre heating steel filament decreases the tensile strength but it also increases what property of the metal.
increases Ductility
pg 15
This welding preparation reduces hardness, improves ductility, and prevents cracking in high carbon steels.
Pre-heating
pg 13
what type of flux is used to add alloying metals to a weld
Active Flux
Pg.29
This variable most strongly affects penetration and burn-off rate in SAW
amperage
page 16
What are 2 types of feeding systems used for flux?
Pneumatic and gravity fed
pg.14
the annealing of steel will decrease what property?
Tensile strength
This immediate and after welding practice reduces hydrogen-induced cracking by allowing hydrogen to diffuse out.
postheating
page 16
This type of SAW flux contributes alloying elements to the weld metal, intentionally modifying its chemical composition during welding.
Alloy Flux
Pg.29
A longer arc length corresponds to an increase in this electrical variable.
Voltage
page 16
what transfers the current to the welding wire?
contact tube
pg.13
pre heating heavy sections can help with what from happening
prevents cracking or high stress from happening
page 15
Heating steel above the upper critical temperature and cooling in still air is this high-temperature treatment.
Normalizing
page 20
what type flux doesn't change the metal chemical analysis?
neutral fluxes
Pg.29
ncreasing this variable narrows the bead and risks undercut if excessive.
travel speed
what are the 2 types power sources used in the wire feeding system process?
CC and CV (Constant Current and Constant Voltage)
Pg.12
what is the effect on the material when contraction and expansion are restrained.
high stress on the material
This temperature marks the beginning of steels transformation into a different form
Lower Critical temperature or transformation temperature.
page 19
what type of flux is manufactured with a mixture of Silica sand, metal oxides and small amounts of halide salts.
Fused Flux
A rule of thumb for this SAW setting is eight times the wire diameter
Stick out/ electrode extension
page 17
what are the types of drive rolls used in a drive roll asselmby?
V grooves and knurled groove
Pg.11
Tempering is what kind of process?
Hardening process
This brittle needle like microstructure forms if steel is cooled too fast from high temperatures.
Martensite
what type of flux is manufactured with finely divided oxides with 2 more more metals.
Bonded Flux
Pg.28
What direct current setting is best for penetration in a weld?
DCEP
pg
what are many SAWs power sources duty cycles rated for?
100%
pg.9