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S. A. Rizvi et alii, Frattura ed Integrità Strutturale, 56 (2021) 84-93; DOI: 10.3221/IGF-ESIS.56.07

Wire feed speed (Ipm)

Experimental run

Arc voltage (V)

Gas flow rate (lpm)

Hardness (VHN)

Std run

Toughness (J)

9 6

1 2 3 4 5 6 7 8 9

24 27 26 25 26 26 25 25 26 26 26 27 27 28 26 27 26 26 26 25

350 300 350 300 350 350 400 300 350 350 434 300 400 350 350 400 350 350 266 400

15 20 15 20 15 10 10 15 15 15 10 20 15 15 10 23 15 15 20 6

200 156 266 188 258 261 186 242 274 255 188 214 190 208 268 192 194 260 156 202

178 181 161 186 199 159 165 171 165 162 182 196 180 206 150 181 186 155 189 175

16

5

13 20

3 1

15 19 12

10 11 12 13 14 15 16 17 18 19 20

2 8

10 18

4

14 17 11

7

Table 3: DOE table with responses

Figure 1: toughness test samples.

R ESULT AND DISCUSSION

Development of mathematical model n this work arc voltage (V), wire feed speed (F), and gas flow rate (L) were selected as welding process parameters. Mechanical properties, i.e. toughness and hardness of welded joints, are significantly affected by welding parameters and it is very clear from previous research work that toughness and hardness of IS 2062 steel weldments is I

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