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CONTROL OF WELDED PIPES HOMOGENEITY BY
USE OF INFRARED THERMOGRAPHY AND FINITE
ELEMENT METHOD.
Sougrati BELATTAR
Cadi Ayyad University, Faculty of Sciences Semlalia,
Marrakesh Morocco
Welcome to Our Presentation
Cadi Ayyad University, Faculty of Sciences Semlalia Marrakesh Morocco
Introduction :
Non-destructive Testing is a technique of inspection and detection of defects
presence in a given structure
There are many methods of nondestructive testing
Infrared Thermography (ITR) is one of the principal NDT methods and one of the
most attractive and promising techniques
The objective of this work consist in:
the use of infrared properties
the finite element method
to analyze the welded pipe quality by analyzing the surface temperature of
the structure (pipe + welding) through calculated thermograms,
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Studied
model
l=3000 mm
e𝑤=8 mmA
C
B
D
d=
12
0 m
m
Thermally controledsurface
COPAEND, 21/10/2019Cadi Ayyad University, Faculty of Sciences Semlalia Marrakesh Morocco
Below is presented the considered structure compound of two parts
Aluminum pipe and the welding
The whole structure is associated by a weld
Studied model
COPAEND, 21/10/2019Cadi Ayyad University, Faculty of Sciences Semlalia Marrakesh Morocco
The structure presented in detail
The whole structure Section cup of the
structure according
to ABCD section
Section cup of the
welded region
Numerical modeling
COPAEND, 21/10/2019Cadi Ayyad University, Faculty of Sciences Semlalia Marrakesh Morocco
Numerical modeling
COPAEND, 21/10/2019Cadi Ayyad University, Faculty of Sciences Semlalia Marrakesh Morocco
Numerical modeling
To analyze the results of simulations, we introduce relative thermal
parameters :relative conductivity krand relative capacity Cr,
The relative thermal conductivity kr, defined by the ratio
kr= kwelding/ kpipe
The relative thermal capacity Cr, defined by :
Cr = kwelding / kpipe
COPAEND, 21/10/2019Cadi Ayyad University, Faculty of Sciences Semlalia Marrakesh Morocco
Firstly we consider the
following relative
quantities
ρaluminum = ρweldingCpr = kwelding/ Cpaluminum
Effect of thermal conductivity
Kr = kwelding/ kaluminum
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Kr = [0.25; 0.5; 0.75; 1; 1.25; 1.5; 1.75]
Cadi Ayyad University, Faculty of Sciences Semlalia Marrakesh Morocco
In second time the
following relative
quantities
ρaluminum = ρweldingCr = kwelding / Caluminum
Effect of thermal capacity
Kr = kwelding/ kaluminum
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𝑪𝒓 = [0.25; 0.5; 0.75; 1; 1.25; 1.5; 1.75]
Cadi Ayyad University, Faculty of Sciences Semlalia Marrakesh Morocco
COPAEND, 21/10/2019
Thermograms for variable conductivity
Cadi Ayyad University, Faculty of Sciences Semlalia Marrakesh Morocco
Calculated thermograms
We have the same temperature except the region of welding
Kr = 0.25 Kr = 1
for a duration of 600s of heating the evolution of
welded pipe temperature along the external axis of pipe
Thermograms of welded pipe For
Kr= 0.25,Kr=1 and Kr= 1.75COPAEND, 21/10/2019Cadi Ayyad University, Faculty of Sciences Semlalia Marrakesh Morocco
Calculated thermogram for variable kr :
Kr = 1.75
for a duration of 600s of heating the evolution of
welded pipe temperature along the external axis of pipe
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Thermograms of welded pipe For
Cp= 0.25, Cp= 1 and Cp= 1.75Cadi Ayyad University, Faculty of Sciences Semlalia Marrakesh Morocco
Calculated thermogram for variable Cr :
Cr = 0.25 Cr = 1 Cr = 1.75
Conclusion
In this paper, we analyzed
the surface temperature on
a welded aluminum pipe as a
function of two parameters:
effect of the thermal
conductivity
the effect of the heat
capacity
The detectability of the
presence (or quality) of
welding becomes easier for a
greater (or smaller) thermal
conductivity of the welding
material compared to that of
the aluminum pipe.
The detectability of the
presence (or quality) of the
welding material becomes
easier for a greater (or
smaller) heat capacity of the
welding material compared to
that of the aluminum pipe.
The smaller the difference
in surface temperature, the
closer the thermophysical
characteristics of the
welding and the pipe are,
the better welding we have,
COPAEND, 21/10/2019Cadi Ayyad University, Faculty of Sciences Semlalia Marrakesh Morocco
Perspectives
We are searching for the
application of this method
to evaluate the quality of
the welding in term of air
bubble and cracks,
COPAEND,21/10/2019Cadi Ayyad University, Faculty of Sciences Semlalia Marrakesh Morocco
Thank You for
Watching!
Sougrati BELATTAR
Cadi Ayyad University, Faculty of Sciences Semlalia
Marrakesh, Morocco
Any Questions?
21/10/2019COPAEND