CHARACTERISTICS :
- Standardized with coating of special basic flux system.
- Non-synthetic Ni-Cr-Mo-Nb electrode for welding of NiCrMo alloys and super-austenitic stainless steels.
- Welds of radiographic quality.
- Pleasing behavior in terms of smooth arc, low spatter and easy de-slagging.
APPLICATIONS :
Highly versatile, nickel-base alloy electrode suitable for a wide range of applications :
- Cryogenic vessels & pipe work of 9% Ni steel (Q & T grade) for temperatures down to minus 196oC.
- Elevated temperature services in furnace equipment & petrochemical plants & power generation plants, involving temperatures above 900oC.
- Joining & surfacing in fabrication.
- Repair & maintenance welding, especially in reclamation of dies.
- Base materials: Inconel 625, Inconel 601, Incoloy 800H, 825, & similar.
ASTM B 443, B 444 & B 446, which have UNS Number N 06625.
SPECIAL PROPERTIES :
- Weld metal is characterized by stable properties over a wide range of temperatures from minus 200oC to about 1000oC.
- Presence of high levels of Cr, Mo & Nb confer resistance to general corrosion, as also to pitting, crevice, & stress corrosion cracking in chloride media. (PRE>50).
- Higher tensile strength, as compared to other standard Nickel-base alloys.
- Tolerance to dilution in many combinations of nickel-base alloys and steels.
CHEMICAL ANALYSIS OF ALL WELDS DEPOSIT (%) :
| C | Mn | Si | Cr | Ni | Mo | Nb+Ta | Cu | *Fe | Co | S | P | Others |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0.10 max | 1.0 max | 0.75 max | 20.0-23.0 | 55.0 min | 8.0-10.0 | 3.15-4.15 | 0.50max | 5.0 max | 0.12 max | 0.020 max | 0.030 max | 0.50 max |
(*Fe is normally below 2.0%)
ALL WELD MECHANICAL PROPERTIES :
| Ultimate Tensile Strength | Elongation (L = 4d) % | CVN Impact Values (Joules) at | Lateral Expansion at -196oC | |
|---|---|---|---|---|
| At +20oC | At -40oC | |||
| As Welded | 760 min | 30% min | 40 min at +20oC | 0.40 min |
| 30 Min at -196oC | ||||
| APWHT 700oC/20 Hrs. (Typical) | 870 | 30% | 50 at 0oC | 0.75 at 0oC |
| 35 at -196oC | 0.55 at -196oC |
WELDING CURRENT RANGES FOR SIZES MANUFACTURED :
| Dia (mm) | 2.5 | 3.15 | 4.00 | 5.00 |
|---|---|---|---|---|
| Length (mm) | 350 | 350 | 350 | 350 |
| Current (amp) DC+ or AC70V | 60-85 | 80-100 | 100-140 | 150-190 |
NOTE ON USAGE :
- Thorough cleaning of joint faces in essential to prevent pores & cracks.
- Redry electrodes of at 200o-250oC for 1-2 hours & transfer them to a holding oven maintained at 70o-80oC.
- Use short arc to the extent possible.
- Stringer beads are to be preferred but weaving, when necessary, be restricted to maximum 2 ½ times the core wire diameter.
- In order to avoid crater crack, fill up crater properly & draw the arc away to the side.
- Use minimum currents consistent with proper fusion, so as to control dilution, especially in buttering of alloy steels.
- Preheating & interpass temperatures and PWHT is determined by the class of base materials.