Premium 90G
Classification :
- IS : 1395 - 82 : E 63 B -G1 29 Fe
- AWS / A 5.5 : E 9018 G
Description :
A basic coated low hydrogen electrode designed for welding high strength low alloy steels and also quenched and tempered steels. The weld metal possesses excellent toughness at sub zero temperatures down to minus 50oC. Metal recovery is approx. 115%. Gives radiographic welds. Diffusable hydrogen in weld metal is around 5 ml. per 100 gms of weld metal.
Applications :
- High tensile steels upto 70 Kgf./mm2
- Heavy structures subjected to dynamic loading and impact
- Earth moving equipments, pressure vessels, penstocks etc.
Chemical Composition of Weld Al (wt.%)
| C | Mn | Si | Cr | Ni | Mo |
| 0.10 max | 12 - 18 | 0.5 max | 0.03 max | 0.6-1.0 | 0.03 max |
Mechanical Properties Of Weld Metal :
| YS | 56 - 66 Kgf/mm2 |
| UTS | 66 - 74 Kgf/mm2 |
| Elongation | 18 % min |
| Reduction in Area | 55 % min. |
| CVN Impact Values | 30 Joules (Min) at -51oC |
Current Conditions : AC (50V) / DC ( + )
| Size (mm) | 2.5 x 350 | 3.15 x 450 | 4 x 450 | 5 x 450 |
| Amps | 80 - 100 | 100 - 140 | 140 - 180 | 190 - 240 |
Welding Positions : F, H, V-up, OH
Recommendations :
Redry the electrodes at 350oC for one hour or at 250oC for two hours. Keep the redried electrodes in a holding oven at 120o to 150oC. Use the electrode directly from the holding oven. Preheat and inter pass temperature of 100o to 150oC is recommended. Stress relieving temperature should be 620oC for one hour.