1995 Volume 35 Issue 1 Pages 63-70
Rectangular blocks of "all weld" C-Mn steel deposit were prepared by multipass submerged arc (SAW) process employing different currents (500-750 A), arc voltages (27-40 V) and speeds (40-60 cm/min), using a 4 mm diameter filler wire and a basic agglomerated flux. Varying the welding parameters influenced the macrostructure comprising coaxial dendrites and reheat refined regions whose amounts were determined by quantitative metallography. The blocks were characterized for their mechanical properties and the structure property correlations wer established.
Since the macrostructure emerged as a Key-parameter influencing the mechanical properties of the aforesaid products, model expressions were developed for quantitatively estimating the area fraction of dendrites and the reheat refined regions, starting from the first principles, by incorporating the effect of weld thermal cycle, bead geometry and the resultant structural changes. Validity of the model expressions was experimentally verified. The importance of the study is that it may be possible to optimize the process to attain a desired set of end properties without the necessity of having to run through a very rigorous and time consuming schedule of experimentation.