Thermal Modeling Of weld cladding

8/18/2019 Thermal Modeling Of weld cladding

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Thermal modeling

Welding


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Objective

The objective of the simulation is to predict

• Temperature distribution and

• Thermal stress distribution.


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Basic Theory

• Welding is a fundamental manufacturingtechnique used to join metal components.there are a wide variety of welding procesmost involve the application of heat to ind

coalescence of the metal in the adjoining • In welding, extreme thermal loading is appthe parts being joined, and complex materesponses are initiated. The steep, localizethermal gradients result in stress concentrin the weldin zone.


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Why Abaqus?

Key Abaqus Features and Benefts:• ombined thermal!mechanical analysis procin sequentially coupled or fully coupled form

• "e#nition of transient heat sources and weld

material deposition via user subroutines• $bility to specify complex thermal and mechmaterial de#nitions, including temperature a#eld variable dependence and latent heat e%


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Used parameters


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Thermal Analysis Procedure

•

transfer resulting from the thermal load of the movin Two user subroutines are activated for the thermal aas described below&

• DFU!& 'sed to de#ne the welding torch heaas a concentrated (ux. The heat source trave

the weld line to simulate the torch movement• "AP#O$& 'sed to activate the conduction of between the deposited weld material and thematerials once the torch has passed a given l


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%esults

•

Typical thermal results are shown in )igure *, which displcontour of nodal temperature as the torch travels along tline.

• The weld is initialized and no heat is allowed to transfer fweld until the torch passes. $s the torch passes a given pthe weld line, the (ux input is initiated, resulting in a loca

increase in temperature.

• In addition, as the torch passes the same weld line point,conductive heat transfer is activated, causing a rapid drotemperature as thermal energy is transferred to the surrostructure.


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Write about stress dist. $nd #guno.


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#onclusion

•

In conclusion, $baqus+tandard provides a set ofgeneral, (exible modeling tools that allow for thprediction of thermal stresses and temperaturedistribution in welded components.


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%e&erences

•

Abaqus reerences:

• )or additional information on the $baqus capabilities referthis brief, see the following $baqus -.* documentation re

• $baqus $nalysis 'ser/s 0uide

•

1)ully coupled thermal!stress analysis,2 ection -.3.• $baqus 'ser ubroutines 4eference 0uide

• ! 1DFU!,2 ection *.*.

• ! 1"AP#O$,2 ection *.*.*5


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Other reerences:• 4eenal 4itesh hand, Ill oo 6im, 7ian 7ian Wu,

yong 6ang and 9i:eon him,2 ;rediction of 4esidutress and Welding "eformation in 8utt!weld 9oin"i%erent lamped ;osition on the ;lates2, Intern

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Thermal Modeling Of weld cladding

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