SMAW Welding Review
4th number meaning
0,2,3,4,7= AC or DC straight polarity 1,6,8= AC or DC reverse polarity 5= DC reverse polarity
diameter of an electrode
1/8"- 3/8"
length of an electrode
14"- 18"
1
1= good for all positions 2= flat and horizontal 3= flat only
3
3= AC or DC current and flux
transformer welder
AC, inexpensive, amperage capacity of 200-400, most popular
transformer- rectifier welder
AC/ DC, can weld metals of many thicknesses, easier to weld thin metals
generator welder
DC, driven by an outside power source, preferred by most welders
SMAW
Shield Metal Arc Welding
what is shield metal arc welding
a process of fusing metals together by the heat of an electric arc; arc or stick welding
straight polarity
also called electrode negative (E-), electricity is flowing from the electrode to the metal, best for shallow welds ELECTRICITY IS FLOWING NEGATIVE TO POSITIVE (EDISON THEORY)
reverse polarity
also called electrode positive (E+), electricity is flowing from the base metal to the electrode, best for deep penetrations
american welding society
assigns numbers that identify electrodes
E6013 electrode
e= electric arc
destructive
guided bend, tensile strength, shards
purpose of slag deposit
helps protect the weld by allowing it to cool slowly
selecting electrodes
identify electrodes by a number or color
electrode
metal rod that melts and becomes part of the weld
ways to identify metals
metal supplier use of metal appearance chips magnetism weight sparks
types of weld tests
non destructive destructive
purposes of the flux
shielding stabilizes arc purifier protects from the apmosphere
polarity of DC welders
straight polarity, reverse polarity
60
tensile strength x 1000
slag deposit
the impurities that float out and form a crust on top of the weld
flux
the outer covering of an electrode; made out of silicon and other chemicals
duty cycle
the recommended continuous running cycle for a welder
types of welders
transformer, generator, transformer rectifier
Non destructive
visual, x-ray, untrasonic
Basic welding equipment
welder, cables, grounding clamp, electrode holder
