Residual stress laser_welding
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Transcript of Residual stress laser_welding
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© 2011 ANSYS, Inc. December 17, 2014
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Simulation of Laser Welding Process
Ashutosh Srivastava
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© 2011 ANSYS, Inc. December 17, 2014
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Problem StatementSimulate the laser welding process to determine thermal stresses and heat affected zone in the structure. This is done on a simple model as shown below.
Plate 1
Plate 2
Weld
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Mesh Details
Component Nodes Elements
Plate 1 4560 3150
Plate 2 4560 3150
Weld 3094 1760
Total 12214 8060
Sweep mesh was used for the three components. For the plates, three elements were defined through the thickness to capture the bending effects. Lower order mesh was used in this case.
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Material PropertiesAll the parts in the model were assigned same material properties as shown below. For simplicity, no temperature dependent properties were considered. Also material is considered to be linear elastic.
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Contact Definitions
Contact between the plates
Two contact were made:• Contact between the plates. • Contacts between weld and the plates.
Contact between weld and plates
For this contact we further defined a critical Bonding temperature of 500 C using commands. As soon as the temperature at the contact surface (Tc) for closed contact exceeds this bonding temperature, the contact will change to “bonded.” The contact status will remain bonded for the rest of analysis, even if the temperature subsequently decreases below the critical value.
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Transient Thermal Analysis
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Transient Thermal AnalysisTo simulate the thermal field produced by the welding process, it is necessary to model the heat source accurately. In this case, moving heat was modeled using the “Moving_Heat_Flux_R150_v3” ACT extension which is available for download from ANSYS support website.
Please refer to the “Moving_Heat_Flux_R150_v3” ACT extension documentation on how to use this extension.
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Loading conditions – Moving Heat Flux
Faces on which moving heat flux was applied
Edge Defining the path of the heat source
Starting point of the moving heat source
Velocity of source = 5mm/sec
Start time = 0secEnd Time of the heat source = 44sec
Intensity of laser = 7.5 W/mm2
Radius of laser beam = 5mm
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Loading conditions – Convection
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Temperature Field
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Heat affected ZoneHeat affected is calculated based on the region which has seen 500OC or more temperature during the process.
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Thermal Stress Analysis
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Thermal Stress Analysis
To predict stresses due to the thermal field generated by the transient thermal analysis, drag and drop a “Static Structural” module on “Transient Thermal” as shown below.
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Boundary Conditions
Faces on which moving heat flux was applied
Frictionless Support
Compression Only Support
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Loading conditions – Imported Temperature
Temperature from Transient thermal is then imported in the Static Structural for all the steps at which Transient thermal has written data. In total for this case there were 122 steps. Thus we defined 122 steps in Static Structural and imported the data at each step.
Result Sets from Thermal Analysis
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Contact and Stress Results
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Heat affected ZoneHeat affected is calculated based on the region which has seen 500OC or more temperature during the process.
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Thank You