In addition to the electrode classification
numbers, iron and steel electrodes may be identified
by a standard color code set up by the National
Electrical Manufacturers' Association (NEMA).
This method of electrode identification uses a
two-color system consisting of a primary color
located on the end of the electrode and a secondary
color located near the top end of the electrode.
Figure 10-7 shows the location of the primary and
s e c o n d a r y on the end grip and center grip
electrodes. Part of the electrode color identification
table produced by NEMA is reproduced in table
PREPARATIONS FOR WELDING
Before beginning to weld, be sure you have all
the required equipment for welding and all the
equipment needed for your personal protection. Be
Figure 10-7.--Electrode color markings.
sure the welding machine is in good condition. Do
Table 10-2.--Color Markings For Electrode Identification
Mild steel and low alloys (See Note I)
Hard surfacing (See Note II)
fillets & flat
Mild steel for cast iron
Brinell 200 min
Cast iron for cast iron
Brinell 300 min
Brinell 400 min
Brinell 500 min
Brinell 600 min
Brinell 700 min
Ni Cr MO
Ni Cr Cu
Electrodes listed with prefix letter are AWS designated grades.
Hardness shall be determined as follows:
(a) Use a base plate of mild steel 5" square 1" thick.
(b) Use 3/16" electrode.