High strength low carbon steel plate material  IS 2062 E350 equivalent ASTM standard is A-572-50.

The chemical composition (all in % Wt. ) of this material is as under:- C: 0.20 Max, Mn: 1.50 Max, S: 0.045 Max, P: 0.045 Max, Si: 0.45 Max, (Nb+V+Ti): 0.25 Max & C.E Value 0.47 Max.

Ref:-

Click to access is.2062.2011.pdf

https://www.aerospacealloy.com/carbon-steel-is-2062-e350-sheet-plate-manufacturer-supplier.html

The Suitable matching SAW Filler wire material is AWS EM12K as per AWS, SFA 5.17 “Specifications for carbon steel electrodes and fluxes for submerged arc welding”. 

The chemical composition of filler wire (all in % Wt. ) is below:- C: 0.11, Mn: 0.956 %, Si: 0.22%, Ph: 0.006%, S:0.008%, Cu:0.34%

With CVN (ft-lbs): 24-29 @-60 °F

For the complete chemical composition of these wires, see AWS Filler Metal Specification A5.17

(Ref:- https://www.esabna.com/euweb/awtc/lesson6_26.htm)

Regarding the selection of flux, The flux is characterized by its property known as Basicity Index (B.I.) , which is responsible for the transfer of oxygen to the weld metal.

Basicity of the flux is defined as the mass ratio of ‘basic’ to ‘acid’ oxides in the slag phase. Value of Basicity greater than one is termed as “ chemically basic”, the ratio of B.I near or equals one (Unity)  is termed as chemically “neutral” and those less than one is termed as chemically “acidic”.

The basicity or acidity of flux is decided by the presence component/ingredients. Such as Chemically, basic flux is high in MgO or CaO and defined as :

Ref:  Tuliani S.S., Boniszewski T. and Eaton N.F., 1969.“Notch Toughness of Commercial Submerged-Arc Weld Metal”, Welding and Metal Fabrication, 37(8):327-339.

Some of the important characteristics of Basicity fluxes are as under:-

– Rich in CaO, MgO, CaF2, Na2, K2O and MnO ingredients.

– Less density and viscosity

-Lower weld metal oxygen content (Produced  by agglomeration technique)

– Better mechanical properties ( impact Strength) owing to less amount of inclusions and gases.

-Lower current carrying capacity and penetration depth capacity as compared to acidic flux.

– Hygroscopic In nature, therefore, poor tolerance for rust and scaling.

-Better deposited weld metal chemistry.

Oxygen content in deposited weld metal decrease with increasing flux basicity up to 1.25, therefore, the reduction in oxygen level in weld metal result in clean weld with respect to oxide inclusions and consequently improves strength and toughness of the weld metal. Therefore, To take the benefit of the strength of this material Agglomerated Fluoride basic flux(BI=1.6) will help you achieve, clean weld, with fewer oxide inclusions and therefore, improved mechanical strength and particularly toughness (CVN (ft-lbs): 24-29 @-20 °F ) of the weld metal.

Ref:-

Davis M.L. and Bailey N., 1991. Evidence from inclusion chemistry of element transfer during Submerged arc welding, Weld J, Suppl. Res., 70(2):57-61.

Kanjilal P., Pal T.K. and Majumdar S.K., 2006. Combined effect of flux and welding parameters on chemical composition and mechanical properties of submerged arc weld metal, Journal of materials Processing Technology, 171:223-231.