Effects of Heat Input and Nature of Impact Fracture in the Heat Affected Zones in Arc Welding

In the present study an attempt has been made to investigate the effects of welding beat on some of the mechanical as well as metalilurgical properties of weldments in the heat affected zones.

To achieve the objectives five welded samples fabricated from hot rolled structural steels (carbon varying from 0.15% to 0.22%) plates (10 mm thick) have been experimented with. The samples are of single V-butt joint, manually arc welded, using multiple runs.

Using polynomial regression analysis the best-fit equations have been obtained to find the inter-relationships of : 

1) hardness (F) with grain size (S), impact energy value (E), heat input per unit length of weld (H) and percentage carbon (C).

ii) impact energy value (E) with heat input per unit length of weld (H) and percentage carbon (C).

iii) grain size (S)with heat input per unit length of weld (H).

iv) percentage carbon (G) with heat input pet unit length of weld (H).