PSI - Issue 14

P D Gosavi et al. / Procedia Structural Integrity 14 (2019) 304–313 P D Gosavi et al./ Structural Integrity Procedia 00 (2018) 000 – 000

312

`

(c)

(d)

Shear plane, Cracks

(e)

Fig.10. (a) DBTT Plot for W1 (SMAW) & related fractography of sample at -40° C at 1 KX (b) DBTT Plot for W2 (GTAW) & related fractography of sample @ -40° C at 5 KX (c) DBTT Plot for W3 (SAW) Centre & related fractography of sample @ -40° C at 1 KX (d) DBTT Plot for W3 (SAW) Sub-surface & related fractography of sample @ -40° C at 1 KX (e) DBTT Plot for W4 (GMAW) & related fractography of sample @ -40° C at 1 KX

4. CONCLUSIONS

From the detailed investigation on the microstructure and properties of the welds the following can be considered as important findings. The consumables developed produced quality welds in terms of mechanical properties in thicker sections. The welding procedure used could not only produce a sound weld in thicker sections but also resulted in suitable cooling rate which contributed to have higher volume fraction of AF in weld metal making the joints strong and tough. The desirable weld metal properties could be obtained over a range of heat input (1.2 to 2.4 kJ/mm).The DBTT was observed to be highest with a moderate heat input (1.8 kJ/mm) for GTAW process (W2).