Page 17 - SSAB Welding Handbook Edition 2

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Welding handbook 3.0 The thermal cycle of a welding performance

Alt 2: Alt 2:
©SSAB
Formula 3.1 can be used for all types of plate Calculation of the t value can be made according to
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thicknesses subjected to two-dimensional heat flow: formula 3.2:

2
Q 2 ( 1 ) ( 1 ) 2 1 1
5
t = ( 4300 - 4.3 T ) x 10 x d 2 x 500 - T 800 - T x F 2 t = (6700 - 5 T ) x Q xx 0 500 - T 800 - T x F 3
8/5
0
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0 0 0 0
Formula 3.1 Formula 3.2
d: Plate thickness [mm] d: Plate thickness [mm]
Q: Heat input [kJ/mm] Q: Heat input [kJ/mm]
T : Initial plate temperature [°C]. T : Initial plate temperature [°C].
0
0
If preheating is performed, this temperature is stated. If preheating is performed, this temperature is stated.
F : Shape factor, se table 3.8 F : Shape factor, se table 3.8
2
3

The t value during three-dimensional
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heat flow

The t value can be concluded according to the
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figure below for all types of plate thicknesses during
three dimensional heat flow.

Alt 1:

Figures for run on plate welds are specified in
fig. 3.9.

50
40
30
20 200°C 100°C
1 1 Tp=250°C 150°C 20°C
10

5
0,5 1 2 3 4 5
2 2
1 Cooling time t [s]
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2 Heat input [kJ/mm]
Tp = Preheat temperature [°C]

Fig. 3.9: Cooling times for run on plate joints of different plate
thicknesses during three dimensional heat flow.

The t value for the welding situation is calculated by
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multiplying the t value for the run on plate weld with
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the shape factor F that was determined during step 2.
3
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all liability of any kind, including any damages, in connection with the use of the information and for their suitability for individual applications. 17
It is the responsibility of the user of this brochure to adapt the recommendations contained therein to the requirements of individual applications.