GEN 718 Overview
GEN 718 รจ utilizzato per la saldatura TIG delle leghe 718, 706 e X-750. ร utilizzata principalmente per la saldatura di componenti aeronautici ad alta resistenza e di componenti di razzi a propellente liquido con temperature criogeniche. Questa lega puรฒ essere indurita per invecchiamento per ottenere resistenze piรน elevate.
AWS Chemical Composition (Typical)
| %C | %Cr | %Ni | %Mo | %Ti | %Fe | %Mn | %B |
|---|---|---|---|---|---|---|---|
| 0.08 max. 0.045 |
17.0 โ 21.0 18.5 |
50.0 โ 55.0 53.8 |
2.80 โ 3.30 2.90 |
0.65 โ 1.15 0.95 |
Rem. 17.7 |
0.35 max. 0.05 |
0.006 max. 0.003 |
| %Si | %P | %S | %Cu | %Al | %Nb+Ta | Total Others |
|---|---|---|---|---|---|---|
| 0.35 max. 0.06 |
0.015 max. 0.007 |
0.015 max. 0.001 |
0.30 max. 0.10 |
0.20 โ 0.80 0.55 |
4.75 โ 5.50 5.18 |
0.50 max |
Typical Weld Metal Mechanical Properties
| Tensile Strength | 125,000 psi | 862 MPa |
| Yield Strength | 85,000 psi | 586 MPa |
| Elongation | 28% |
Typical Welding Parameters
| Process | Diameter | Voltage | Amperage | Gas/Flux |
|---|---|---|---|---|
| TIG (GTAW) | 1/16โ (1.6 mm) | 14 โ 18 | 90 โ 130 | 100% Ar |
| 3/32โ (2.4 mm) | 15 โ 20 | 120 โ 180 | 100% Ar | |
| 1/8โ (3.2 mm) | 15 โ 20 | 150 โ 220 | 100% Ar | |
| MIG (GMAW) | .035โ (0.9 mm) | 26 โ 30 | 150 โ 200 | 75% Ar โ 25% He |
| .045โ (1.1 mm) | 28 โ 32 | 180 โ 230 | 75% Ar โ 25% He | |
| Sub Arc (SAW) | .093โ (2.4 mm) | 28 โ 30 | 275 โ 350 | |
| .125โ (3.2 mm) | 29 โ 32 | 350 โ 450 |