®COPYRIGHT
2000 THE ESAB GROUP, INC. LESSON
VI 6.7.1.4
These filler metals may be used with
all GMAW metal transfer modes. The AWS mechanical
properties and impact properties are established using argon plus 1-5% oxygen
as a shielding gas. Straight
CO2 and argon-CO2
mixtures may be used. These mixtures will produce
welds with deeper penetration, although impact properties will be somewhat lower.
6.7.1.5 Welding
low alloy high strength steels with the GMAW process requires that pre-
heat, interpass, and post-weld temperatures
be closely controlled to prevent cracking. The low
carbon filler metals designated by
the letter “L” will provide greater resistance to cracking, and
are more suitable when post-weld heat
treatment is not practical or possible. 6.7.2
The
Nickel Alloy
Types (Ni)
- The letters “Ni”
designate that the filler metal is a nickel alloy wire
for welding the nickel alloy steels. The number following
the letters designates the chemical composition
of the wire. Figure 10 shows only the amount
of nickel required in the wire under this specification.
For complete chemical requirements,
see AWS A5.28-96 Filler Metal Specification.
6.7.2.2 Figure
11 shows the mechanical property requirements for nickel alloy weld metals.
Tensile Yield
Strength Strength
Elongation
Impact AWS
Class psi
psi in
2", % Properties
ER80S-B2 80,000
68,000 19
Not Required ER80S-B2L
80,000 68,000
19 Not
Required ER90S-B3
90,000 78,000
17 Not
Required ER90S-B3L
90,000 78,000
17 Not
Required All values
are mininums MECHANICAL
PROPERTIES OF Cr - Mo WELD METAL FIGURE
9 Nickel
AWS Class %
by Weight ER80S-Ni1
0.80 - 1.10 ER80S-Ni2
2.00 - 2.75 ER80S-Ni3
3.00 - 3.75 NICKEL
REQUIREMENTS NICKEL
ALLOY SOLID BARE WIRES FIGURE
10 Tensile
Yield Strength
Strength Elongation
Impact AWS
Class psi
psi in
2", Min. Properties
ER80S-Ni1 20
ft-lb @ -50°F ER80S-Ni2
80,000 68,000
24 20
ft-lb @ -80°F ER90S-Ni3
20 ft-lb @ -100°F
All values are mininums
MECHANICAL PROPERTIES OF NICKEL ALLOY
WELD METALS FIGURE
11 }
