I know that using metallographic analysis it is possible to experimentally determine the width and depth of the fusion zone and heat affected zone. But I want to calculate it or determine it from theoretical calculations of temperature field. I know that using Rosenthal´s approach this is a straightforward procedure. But Rosenthal´s equations are based upon point or line heat source and I use a distributed heat source (double ellipsoidal), with Green function method combined with numerical integration over time to calculate temperature fields. Once I got this, how can I calculate the FZ and HAZ parameters?
Really Heat affected zone is measured regarding the micro-structure changes in the weld and also according to the experts. The theoretically calculation of HAZ may be not accurate to depend.
You can find such formula in chapter three of AWS Welding Handbook {Heat Flow in Welding}
1/Tp-To = 4.13pchY/ Hnet + 1/Tm-To;
where,
Y is width of HAZ in mm
h: plate thickness in mm
Tp is peak temperature,
To is initial plate temp (room temp or preheat temp),
pc-volumetric specific heat (J/mm3.C),
Tm is melting temp;
Hnet: net heat input (J/mm)
Mikhail Slobodyan
Nowadays computer simulations using finite element method are widely used but the results also must be experimentally verified.Perhaps initially make experimental studies will be easier and faster
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