Welding Conditions of Steels and Cooling Time near the Fusion Line (Report 4)

Case of Submerged Arc Welding Process

Abstract

In case of bead deposited on a plate of carbon steels or high tensile steels (low alloy steels) at room temperatures, with submerged arc welding process, the cooling time from 800°C to 500°C near fusion line "S sec" is presented strictly by the following experimental formula,
S=(60El/v)^{(2.48-0.055t)}/1.84×(10^9-0.228t){1+2/π tan^-1(t-12/3)}
where E: arc voltage, Volt
I: welding current, Amp.
v: proceeding rate of bead, cm/min
t: plate thickness, mm.
The diagram calculatedy this strict formula is shown in Fig. 13. Next the simple formula is as follows,
S=(60El/v)^1.7/1.18×10⁶{1+2/π tan^-1(t-12/3)}
The nomograph of this simple formula is shown Fig. 10. For obtaining the rough values, this nomograph of the simple formula can be used practically. Moreover, the author mentioned for submerged arc welding process that the cooling time from 800°C to 500°C near fusion line has close relation with the maximum hardness affected zone by welding.