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Atom Arc 8018-NM

Atom Arc 8018-NM electrodes are used for welding the quenched and tempered manganese-molybdenum-nickel steels.

Features

Atom Arc 8018-NM electrodes are used for welding the quenched and tempered manganese-molybdenum-nickel steels. This electrode was developed for use on pressure vessels for nuclear reactors where long term stress relieving is required.

Atom Arc 8018-NM
  • Welding Process
  • SMAW (Stick)

Classifications

  • Classifications/Approvals

    • ASME SFA 5.5

Properties

Typical Properties
As Welded  
Yield Strength 85 ksi, 585 MPa
Tensile Strength 95 ksi, 655 MPa
Elongation in 2" 25 %
Stress Relieved 16 hrs. @ 1150°F (621°C)  
Yield Strength 78 ksi, 540 MPa
Tensile Strength 88 ksi, 605 MPa
Elongation in 2" 29 %
Typical Charpy V-Notch Impact Properties  
Testing Temperature 0ºF (-18ºC)  
As Welded 111 ft.-lbs., 150 J
Stress Relieved 16 hrs. @ 1150ºF (621ºC) 118 ft.-lbs., 160 J
Testing Temperature -50°F (-10°C)  
As Welded 65 ft.-lbs., 88 J
Typical Undiluted Weld Metal Analysis  
C 0.043 %
Mn 1.20 %
Si .35 %
P .011 %
S .009 %
Ni .99 %
Mo .54 %

SAW

Accessories

Depositions

Deposition Table
Diameter Optimal Amperage Range Amperage Deposition Rate Efficiency
3/32 in, 2.4 mm 90 A 70 - 100 1.7 lbs./hr., 0.8 kg./hr. 66.3 %
1/8 in, 3.2 mm 120 A 90 - 160 2.6 lbs./hr., 1.2 kg./hr. 71.6 %
140 A 90 - 160 2.7 lbs./hr., 1.2 kg./hr. 70.9 %
5/32 in, 4.0 mm 140 A 130 - 220 3.1 lbs./hr., 1.4 kg./hr. 75 %
170 A 130 - 220 3.8 lbs./hr., 1.7 kg./hr. 73.5 %
3/16 in, 4.8 mm 200 A 200 - 300 4.9 lbs./hr., 2.2 kg./hr. 76.4 %
250 A 200 - 300 5.4 lbs./hr., 2.4 kg./hr. 74.6 %
7/32 in, 5.6 mm 250 A 250 - 350 6.5 lbs./hr., 2.9 kg./hr. 75 %
300 A 250 - 350 7.2 lbs./hr., 3.3 kg./hr. 74 %
1/4 in, 6.4 mm 300 A 300 - 400 7.7 lbs./hr., 3.5 kg./hr. 78 %
350 A 300 - 400 8.7 lbs./hr., 3.9 kg./hr. 77 %

Extra Info

Preheat should be used on hardenable steels to prevent the formation of a hard heat-affected zone. Preheat may also be required in welding heavy sections