Applications
Welding of 0.5% Mo steel used for high temperature and high pressure boiler, pressure piping and tubing and other pressure vessel, chemical and oil refining industries.
Characteristics
N-7018-A1 is an iron powder low hydrogen type electrode for all-position welding which provides the weld metal 0.5% Mo.
Notes on usage
(1) Dry the electrodes at 325-375ºC for about one hour before use.
(2) Preheat at 100-200ºC and postheat at 620-680ºC.
(3) Adopt back step method or strike the arc on a small steel plate prepared for this particular purpose to prevent blowholes at the arc starting.
(4) Keep the arc as short as possible.
Typical Chemical Composition of Weld Metal (%):
C |
Si |
Mn |
Cr |
Mo |
0.08 |
0.54 |
0.78 |
- |
0.56 |
Typical Mechanical Properties of Weld Metal:
Yield Point
N/mm2 (Kgf/mm2) |
Tensile Strength
N/mm2 (Ksi) |
Elongation
(%) |
PWHT |
590 (86) |
680 (99) |
28 |
620 degrees C x 2 hr |
Size and Recommended Current Range (AC/DC+):
Diameter (mm) |
2.5 |
3.2 |
4.0 |
5.0 |
Length (mm) |
350 |
350 |
400 |
400 |
Ampere |
Flat |
55-85 |
90-130 |
140-190 |
190-240 |
V & OH |
50-80 |
80-120 |
110-170 |
|
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. |
