AWS A5.4 E630 Covered Electrodes and AWS A5.9 ER630 filler metals are used for welds of matching strength. For matching corrosion resistance, grade 308 or 309 consumables may be used.
Weld metal properties approach those of the parent metal. Post weld heat treatment is required to achieve full strength. Single pass welds are precipitation hardened, multipass welds must be solution annealed first.
Chemical Composition
Grade | C | Mn | Si | P | S | Cr | Ni | Cu | Nb+Ta | |
630 | min. max | - 0.07 | - 1 | - 1 | - 0.04 | - 0.030 | 15 17.5 | 3 5 | 3 5 | 0.15 0.45 |
Grade 630 can be successfully welded by all standard methods. Preheating is not necessary. Properties comparable to those of the parent metal may be achieved in the weld metal by post-weld heat treatment. As for other high strength steels precaution should be taken in design and welding procedures to avoid concentration of weldment stresses.
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