Classification : AWS : 5.4E309Mo 16 , IS 5206 :E2312.2R16
Characteristics : A medium heavy coated, all positions electrode depositing a 25 Cr, 12 Nl, 2.5 Mo weldment. Gives a quiet and stable arc, low spatter smooth weld bead and easily detachable slag Excellent resistance to chemical corrosion and heat. Radiographic quality of weld metal possess a good oxidation resistance upto 1050°C.
Applications : COSMAX 309 MO Is specially designed for welding of 316 type clad steel as well as dissimilar metals such as molybdenum containing austenitic stainless steel to carbon steel, for welding 309 Mo steel For overlay applications to resist heat and corrosion.
For joining dissimilar steel such as :
a) 18/11-Mo steel to mild steel.
b) Applying sheet linings of 12% Cr steel to mild steel shells.
Weld MetalProperties (%)
C = 0.06-0.10 Mn = 0.8-2.50
Si = 0.3-0.7 Max S = 0.03 Max
P = 0.03 Max Cr = 22-25
Ni = 12-14 Mo = 2.0-3.0
All Weld Mechanical Properties
UTS = 590-71 ON/mm2
YS = 450 N/mm2
Elong (L=4d) % = 30-45 Min
Current Condition – AC or DC (+)
Precautions : Electrodes must be dry, moist electrodes should be redried at 150°C for One hour.