RA 602 CA - Rolled Alloys

GMAW - Gas Metal Arc Welding
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RA 602 CA
GMAW welding of RA 602 CA should be performed using the matching composition weld wire designated as
S 6025. RA 602 CA should be joined using the pulse arc process. For welding material thicknesses less than
3/16” thick use of 100% Argon shielding has been satisfactory. For welding thicknesses above 3/16”, it is recommended
to utilize the welding gas AR Ni5He5CD300. (Available from Airgas 419-666-7155) to reduce the
likelihood of centerline cracking.
GMAW – Pulse Arc Transfer
Wire Diameter Wire Feed Amperes Volts Gas Flow Travel Speed Pulse
0.045 inch 236 in/min 170 A 26 V 38 ft 3 /hr 15 in/min 500 pulse/sec
For applications under 1832°F (1000°C), RA 602 CA may be welded with alloy 617 wire, ERNiCrCoMo-1, using
argon or argon-helium shielding gas. A GTAW cover pass with S 6025 filler wire is necessary to match the
oxidation resistance of the RA 602 CA base metal. S 6025 weld filler should be used at higher temperatures
where alloy 617 has less strength than RA 602 CA base metal.
SMAW - Shielded Metal Arc Welding
Matching chemistry DC basic covered electrodes, 6225 Al (AWS ENiCrFe-12), are available for welding
RA 602 CA. Use a stringer bead technique, electrode inclined approximately 20° in the direction of travel. Keep
the interpass temperature low, below 300°F (150°C). Electrodes must be dry. If necessary, rebake to dry for 2
hours at 480°F (250°C).
6225 Al Electrode Weld Deposit 8 - Nominal Chemical Composition, %
Cr Ni C AI Ti Y Zr Mn Si Fe
25 62 0.2 1.8 0.1 0.02 0.03 0.1 0.6 10
SMAW Weld Metal Mechanical Properties, Room Temperature (minimum)
Ultimate Tensile 0.2% Yield Strength Elongation Impact Strength
Strength
psi N/mm 2 psi N/mm 2 % Ft-lb J
101,500 700 72,500 500 15 22 30
Starting Parameters
Electrode diameter, inch (mm) 3/32 (2.5) 1/8 (3.2) 3/16 (4.0)
DCRP Current, Amps 40-55 70-90 90-110