GEN 625 Overview
GEN 625 is used for TIG, MIG, and SAW welding of nickel-chrome-molybdenum alloys. This filler metal is very versatile in its applications. It can be used for welding of dissimilar joints between nickel-chrome-molybdenum alloys and stainless or carbon or low alloy steels. It can also be used for cladding as well as for spraying applications. GEN 625 with low iron (less than 0.8%) is preferred in various applications where dilution of iron must be controlled to the minimum.
The high alloy content of GEN 625 enables it to withstand highly corrosive environments. The combination of nickel and chromium provides the resistance to oxidizing conditions and the combination of nickel and molybdenum provides resistance to reducing conditions. Due to its molybdenum content, this alloy offers resistance to stress corrosion cracking, pitting, and crevice corrosion.
AWS Chemical Composition (Typical)
| %C | %Cr | %Ni | %Mo | %Ti | %Fe | %Mn |
|---|---|---|---|---|---|---|
| 0.10 max 0.01 |
20.0 – 23.0 22.3 |
58.0 min 64.5 |
8.0 – 10.0 8.8 |
0.40 max 0.22 |
5.0 max 0.34 |
0.50 max 0.03 |
| %Si | %P | %S | %Cu | %Nb + Ta | %Al | Total Others |
|---|---|---|---|---|---|---|
| 0.50 max 0.05 |
0.02 max 0.01 |
0.015 max 0.008 |
0.50 max 0.01 |
3.15 – 4.15 3.56 |
0.40 max 0.19 |
0.50 max |
Typical Weld Metal Mechanical Properties
| Tensile Strength | 110,000 psi | 758 MPa |
| Yield Strength | 65,000 psi | 448 MPa |
| Elongation | 30% |
Typical Welding Parameters
| Process | Diameter | Voltage | Amperage | Gas/Flux |
|---|---|---|---|---|
| TIG (GTAW) | 1/16” (1.6 mm) | 14 – 18 | 90 – 150 | 100% Ar |
| 3/32” (2.4 mm) | 15 – 20 | 125 – 180 | 100% Ar | |
| 1/8” (3.2 mm) | 15 – 20 | 175 – 230 | 100% Ar | |
| MIG (GMAW) | .035” (0.9 mm) | 26 – 32 | 180 – 290 | 75% Ar – 25% He |
| .045” (1.1 mm) | 26 – 32 | 200 – 310 | 75% Ar – 25% He | |
| Sub Arc (SAW) | .093” (2.4 mm) | 25 – 29 | 220 – 275 | |
| .125” (3.2 mm) | 29 – 33 | 300 – 360 |