school
what is the minimum schooling needed for welding
highschool diploma or GED
trapped gas pockets or voids inside the weld metal
porosity
Uses a continuously fed solid wire electrode and a shielding gas
MIG or metal arc welding
flat
To protect your eyes from painful arc flashes welding helmets feature a lens that does this automatically when the arc strikes
auto darkening
how long is the apprenticeship for welding
3-4 years
non-metalic flux or oxide particles trapped inside
slag inclusions
Uses a non-consumable tungsten electrode and an inert shielding gas, with filler metal added manually if needed
TIG
whta is the 2F position
horizontal
Because it is highly flammable and can form explosive mixtures with air this fuel gas must never be used at pressures above 15 psi
acetylene
how can you get a certificate for welding
aws or american welding society
fractures in the base metal
weld cracks
Uses a flux-coated consumable electrode stick that melts to form the weld and a protective slag coating.
stick
what is the 3F position
vertical
Welders must never wear clothing made of synthetic materials like nylon or polyester for this specific safety reason
they melt and stick to the skin
how long is trade school
7 months-2 years
When the weld metal fails to reach the root of the joint
incomplete penetration
uses a tubular wire filled with powdered flux, sometimes eliminating the need for external shielding gas
flux cored arc welding
what is the 4F position
over head
Welding on galvanized steel releases highly toxic fumes of this specific metal element causing metal fume fever
zinc
can you do on the job training
it depends
A melted groove or ditch along the toe of the weld in the base metal
undercut
Uses an oxygen and acetylene flame to melt metal and manually added filler; great for basic learning or cutting
oxy fuel welding
what is the position F
fillet weld
This painful medical condition, essentially a sunburn on the surface of the eye is caused by looking directly at an open welding arc
arc flash or welder flash