Applications
Welding of 780 N/mm2 class high tensile strength steel for penstocks, pressure vessels and machinery.
Characteristics
N – 11018M is an iron powder low hydrogen type electrode and provides good usability with direct current applications in all positions.
The weld metal has a good crack resistance and X-ray soundness.
Notes on usage
(1) Dry the electrodes at 350oC-400oC for about one hour before use.
(2) Store the electrodes at 100-150oC after drying them with attention to keep away from moisture.
(3) Adopt back step method or strike the arc on a small steel plate prepared for this particular purpose, because arc striking on base metal is in danger of initiating cracking.
(4) Keep the arc as short as possible.
(5) Preheat at 150-200oC. The temperature varies in accordance with plate thickness and steel kind.
(6) Pay attention not to exceed proper heat-input because excessive heat-input causes deterioration of impact values and yield strength of weld metal.
Typical Chemical Composition of Weld Metal (%):
C |
Si |
Mn |
Cr |
Ni |
Mo |
0.08 |
0.41 |
1.49 |
0.32 |
1.86 |
0.41 |
Typical Mechanical Properties of Weld Metal:
Yield Point
N/mm2 (Kgf/mm2) |
Tensile Strength
N/mm2 (Ksi) |
Elongation
(%) |
Impact Value
Deg C, J (Deg F, Ft-lbs) |
720 (104) |
820 (119) |
23 |
-51,80 (-60, 59) |
Size and Recommended Current Range (AC or DC +):
Diameter (mm) |
2.5 |
3.2 |
4.0 |
5.0 |
Length (mm) |
350 |
350 |
400 |
400 |
Ampere |
Flat |
70-100 |
100-140 |
150-200 |
190-240 |
V & OH |
60-60 |
80-120 |
120-160 |
140-180 |
Welding Positions:
ALL POSITIONS
Packing:
20 Kg corrugated box, with 4 units of 5 Kg shrinked plastic wrapped paper boxes inside.
Special requests on packing are accepted. |
