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How you decide the range of preheating temperature in welding?
Erpawan
Generally there is no any way to calculate the preheat temperature in welding however, some approaches about it have been developed. Welding method, procedure, thermal conductivity coefficient, workpiece thickness and the carbon equivalent are the substantial factors affecting the preheat temperature. Whether some ideas deny the carbon equivalent term, it is main factor having profound effect on brittle phases in the materials.
preheat temperature may be calculated according to formula below:
Preheat temperature in Degree celcius = 350 * Square root of (C.E - 0.25 )
Where C.E = CC + CT
CT = CC * 0.005 * T
T = thickness of plate in mm
CC = C + Mn/6 + Ni+Cu/15 + Cr+Mo+V/5
In some operations this formula may give higher results than the needed but that formula may be arranged as;
(350*square root of (C.E-0.25))-50 = Actual preheat temperature
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