GEN 622 Overview
GEN 622 is an alloy of nickel with chromium, molybdenum, and tungsten as principal alloying elements. It is used to weld alloys of similar composition as well as dissimilar joints between nickel-chromium-molybdenum alloys and stainless or carbon or low alloy steels.
It can also be used for cladding overlay as well as spraying applications. GEN 622 offers excellent corrosion resistance in oxidizing as well as reducing media in a wide variety of chemical process environments. It offers an outstanding resistance to stress corrosion cracking.
AWS Chemical Composition (Typical)
| %C | %Cr | %Ni | %Mo | %W | %Fe | %Mn |
|---|---|---|---|---|---|---|
| 0.015 max. 0.005 |
20.0 – 22.5 22.2 |
rem. 56.1 |
12.5 – 14.5 14.0 |
2.5 – 3.5 3.1 |
2.0 – 6.0 3.9 |
0.50 max. 0.25 |
| %Si | %P | %S | %Cu | %Co | %V | Total Others |
|---|---|---|---|---|---|---|
| 0.08 max. 0.05 |
0.02 max. 0.003 |
0.010 max. 0.001 |
0.50 max. 0.01 |
2.5 max. 0.05 |
0.35 max. 0.03 |
0.50 max. |
Typical Weld Metal Mechanical Properties
| Tensile Strength | 115,000 psi | 793 MPa |
| Yield Strength | 80,000 psi | 551 MPa |
| Elongation | 36% |
Typical Welding Parameters
| Process | Diameter | Voltage | Amperage | Gas/Flux |
|---|---|---|---|---|
| TIG (GTAW) | 1/16” (1.6 mm) | 14 – 19 | 90 – 130 | 100% Ar |
| 3/32” (2.4 mm) | 15 – 20 | 120 – 175 | 100% Ar | |
| 1/8” (3.2 mm) | 15 – 20 | 150 – 225 | 100% Ar | |
| MIG (GMAW) | .035” (0.9 mm) | 26 – 30 | 150 – 200 | 75% Ar – 25% He |
| .045” (1.1 mm) | 28 – 32 | 170 – 220 | 75% Ar – 25% He | |
| Sub Arc (SAW) | .093” (2.4 mm) | 28 – 30 | 280 – 350 | |
| .125” (3.2 mm) | 29 – 32 | 400 – 550 |