Applications:
Vertical downward welding of ships, building and bridges.
Characteristics
N-7048 is a low hydrogen type electrode for exclusively vertical downward welding. Mechanical properties and crack resistibility of weld metal are good and slag is self-lifting. As higher amperage can be used, the efficiency of vertical welding is remarkably improved compared with vertical upward welding.
Notes on usage
(1) Manipulate the electrode straight downward without weaving and press its tip against the mother plat as shown in the sketch.
(2) Dry the electrodes at 350-400oC for about 60 minutes before use.
(3) Keep the arc as short as possible.
(4) 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.
Typical Chemical Composition of Weld Metal (%):
C |
Si |
Mn |
P |
S |
0.08 |
0.54 |
0.90 |
0.013 |
0.010 |
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) |
480 (70) |
560 (81) |
32 |
-29,110 (-20,59) |
Size and Recommended Current Range (AC or DC +):
Diameter (mm) |
3.2 |
4.0 |
5.0 |
Length (mm) |
400 |
450 |
450 |
Ampere |
VERTICAL |
100-160 |
140-210 |
220-270 |
DOWN |
Welding Positions:
VERTICAL DOWN
Packing:
20 Kg corrugated box, with 4 units of 5 Kg shrinked plastic wrapped paper boxes inside.
Special requests on packing are accepted. |
