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