Joining of Alloy 625 alloy 825 and other similar material, dissimilar Material. Austenitic stainless steel to Ni-Cr-Mo grade
steel of the 9 % Ni type for cryogenic services. Overlay welding of carbon and
Vaccum packing
1G 2F 3G 4G
1) Chip off base metal completely at the repairing part .
2) There is possiblity that cracks spreads or makes holes at both ends of repairing part .
3) Keep the weld metal length less than 50 mm (2 inch ) to disperse welding heat- adopt back steping stone or symmetry method by turns.
4) The preheat temprature vary in accordance with te size ,king and shape of the base metal 150°C is appropriate in general .
| C% | Mn% | Si% | S% | P% | Cr% | Ni% | Mo% |
|---|---|---|---|---|---|---|---|
| 0.10 Max | 1.0 Max | 0.75 Max | 0.02 Max | 0.03 Max | 20 – 23 | 55 Min. | 8 – 10 |
| U.T.S. (N/mm²) | ELONGATION ( L = 4d ) % |
|---|---|
| 760 Min | 30 % Min |
| SIZE ( mm ) | KG PER PACKET | KG PER CARTON | Current (Amps) | In Amps |
|---|---|---|---|---|
| 2.50 x 350 | 2 | 10 | AC/DC (+) | 80 – 100 |
| 3.15 x 350 | 2 | 10 | 100 – 140 | |
| 4.00 x 350 | 2 | 10 | 140 – 180 | |
| 5.00 x 350 | 2 | 10 | 180 – 230 |