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DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.
Development of the Naval
Welding Engineers’ Toolkit
(NAVWET)
National Shipbuilding Research Program
Welding Technology Panel Meeting
March 9, 2017
Daniel Bechetti
Welding, Processing, and NDE Branch
Naval Surface Warfare Center, Carderock Division
DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.
Overview
• Background
– Naval engineers routinely perform a variety of welding-related
calculations to develop welding procedures and testing plans
– Software to perform some of these calculations exists but requires
paid licenses and computer compatibility
– Many of these calculations are made using spreadsheets designed
and maintained by individual engineers
• Objectives
– To develop a suite of calculators for naval welding-related
problems, standardize routine calculations, and acquire reasonable
estimates for more complex calculations
– To build/provide this suite in a ubiquitous software platform so
that it can be easily distributed and updated
– To provide technical references wherever possible so that
calculation methods are clear and can be explored further if desired
NavWeld (Weld QC)
SmartWeld (Sandia National Labs)
2
Examples of currently available software:
DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.
NAVWET
• Naval Welding Engineers’ Toolkit
developed and maintained by NSWC
Carderock
– Computational reference tool
– Built in and run from MS Excel
– Current version contains three ‘modules’ that
perform groups of related calculations
– Technical references provided wherever possible
and detailed descriptions of the calculation
methods and assumptions provided
– All relevant data stored within the spreadsheet
3
DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.
Module 1: Preheat Determination
Purpose:
• To provide reference compositions of typical Naval steels
• To provide a standard calculator for carbon equivalent
• To provide base metal and filler metal preheat and interpass
requirements for S-1, S-2, and S-11 materials as outlined in Tech.
Pub. 1688, Rev. 1
Inputs:
• Base materials
Method:
• Cross-references user inputs with composition database
Outputs:
• Reference nominal compositions for 175 base material and filler
materials variants
4
DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.
Module 1: Preheat Determination
Purpose:
• To provide reference compositions of typical Naval steels
• To provide a standard calculator for carbon equivalent
• To provide base metal and filler metal preheat and interpass
requirements for S-1, S-2, and S-11 materials as outlined in Tech.
Pub. 1688, Rev. 1
Inputs:
• Base materials
• Filler material
Method:
• Cross-references user inputs with composition database
Outputs:
• Reference nominal compositions for 175 base material and filler
materials variants
5
DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.
Module 1: Preheat Determination
Purpose:
• To provide reference compositions of typical Naval steels
• To provide a standard calculator for carbon equivalent
• To provide base metal and filler metal preheat and interpass
requirements for S-1, S-2, and S-11 materials as outlined in Tech.
Pub. 1688, Rev. 1
Inputs:
• Base materials
• Filler material
• Carbon equivalent method
Method:
• Cross-references user inputs with composition database
Outputs:
• Reference nominal compositions for 175 base material and filler
materials variants
• Carbon equivalent values from the user’s choice of 8 calculation
methods
6
DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.
Module 1: Preheat Determination
Purpose:
• To provide reference compositions of typical Naval steels
• To provide a standard calculator for carbon equivalent
• To provide base metal and filler metal preheat and interpass
requirements for S-1, S-2, and S-11 materials as outlined in Tech.
Pub. 1688, Rev. 1
Inputs:
• Base materials
• Filler material
• Carbon equivalent method
• Thickness
• Welding Process
Method:
• Cross-references user inputs with composition database and
preheat tables, including footnotes
Outputs:
• Reference nominal compositions for 175 base material and filler
materials variants
• Carbon equivalent values from the user’s choice of 8 calculation
methods
• Itemized preheat and interpass requirements for the selected base
and filler metals
7
DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.
Module 2: Thermal Behavior
Purpose:
• To provide reasonable estimates of fusion zone cooling rate,
weld pool size, heat affected zone (HAZ) size, HAZ thermal
cycle, and coarse grained HAZ cooling time
Inputs:
• Welding parameters or heat input
Method:
• Fusion zone cooling rate – calculation process described in
AWS Welding Handbook and ASM Materials Handbook
Example Outputs:
1. Cooling rate of weld metal at the chosen temperature, with
tabulation for comparisons
8
DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.
Module 2: Thermal Behavior (Cont.)
Purpose:
• To provide reasonable estimates of fusion zone cooling rate,
weld pool size, heat affected zone (HAZ) size, HAZ thermal
cycle, and coarse grained HAZ cooling time
Inputs:
• Welding parameters or heat input
Method:
• Fusion zone cooling rate – calculation process described in
AWS Welding Handbook and ASM Materials Handbook
• Time-temperature data – Rosenthal model for 2-D and 3-D
heat flow
Example Outputs:
1. Cooling rate of weld metal at the chosen temperature, with
tabulation for comparisons
2. Automatic plotting of steady-state isotherms at chosen
temperatures
9
FZ
FGHAZ
HAZ Edge
DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.
Purpose:
• To provide reasonable estimates of fusion zone cooling rate,
weld pool size, heat affected zone (HAZ) size, HAZ thermal
cycle, and coarse grained HAZ cooling time
Inputs:
• Welding parameters or heat input
Method:
• Fusion zone cooling rate – calculation process described in
AWS Welding Handbook and ASM Materials Handbook
• Time-temperature data – Rosenthal model for 2-D and 3-D
heat flow
Example Outputs:
1. Cooling rate of weld metal at the chosen temperature, with
tabulation for comparisons
2. Automatic plotting of steady-state isotherms at chosen
temperatures
3. HAZ thermal cycle for chosen distance from weld
centerline, with optional overlay on CCT diagram
10
Module 2: Thermal Behavior (Cont.)
DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.
Purpose:
• To provide reasonable estimates of fusion zone cooling rate,
weld pool size, heat affected zone (HAZ) size, HAZ thermal
cycle, and coarse grained HAZ cooling time
Inputs:
• Welding parameters or heat input
Method:
• Fusion zone cooling rate – calculation process described in
AWS Welding Handbook and ASM Materials Handbook
• Time-temperature data – Rosenthal model for 2-D and 3-D
heat flow
Example Outputs:
1. Cooling rate of weld metal at the chosen temperature, with
tabulation for comparisons
2. Automatic plotting of steady-state isotherms at chosen
temperatures
3. HAZ thermal cycle for chosen distance from weld
centerline, with optional overlay on CCT diagram
11
Module 2: Thermal Behavior (Cont.)
DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.
Purpose:
• To provide reasonable estimates of fusion zone cooling rate,
weld pool size, heat affected zone (HAZ) size, HAZ thermal
cycle, and coarse grained HAZ cooling time
Inputs:
• Welding parameters or heat input
Method:
• Fusion zone cooling rate – calculation process described in
AWS Welding Handbook and ASM Materials Handbook
• Time-temperature data – Rosenthal model for 2-D and 3-D
heat flow
Example Outputs:
1. Cooling rate of weld metal at the chosen temperature, with
tabulation for comparisons
2. Automatic plotting of steady-state isotherms at chosen
temperatures
3. HAZ thermal cycle for chosen distance from weld
centerline, with optional overlay on CCT diagram
4. Cooling time from 800°C to 500°C
12
Module 2: Thermal Behavior (Cont.)
DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.
Module 3: Dilution in Overlays
Purpose:
• To calculate the amount of dilution (base metal mixing) in
a weld overlay or cladding
• To calculate the composition of an arbitrary layer in the
overlay or cladding
Inputs:
• Substrate and overlay material class
• Welding parameters
Method:
• Thermodynamic data calculated using ThermoCalc
• Dilution percentage determined using the method
described by DuPont and Marder
Outputs:
• Dilution percentage
13
DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.
Module 3: Dilution in Overlays
Purpose:
• To calculate the amount of dilution (base metal mixing) in
a weld overlay or cladding
• To calculate the composition of an arbitrary layer in the
overlay or cladding
Inputs:
• Substrate and overlay material class
• Welding parameters
Method:
• Thermodynamic data calculated using ThermoCalc
• Dilution percentage determined using the method
described by DuPont and Marder
• Composition calculations performed using bead-on-plate
welding equations, assumptions made for layers other
than the first
Outputs:
• Dilution percentage
• Deposited weld metal composition for a chosen layer
14
DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.
Future Plans
• Fillet weld sizing and design
- To organize and simplify the many possible weld computation factors described in MIL-STD-1628A
• Weld metal constitution diagrams
- For prediction of weld metal solidification mode in similar and dissimilar welds
• Experimental validation of some current calculations to validate assumptions
• Distribution to warfare centers and public shipyards in CY17 for initial testing, user feedback, and
refinement
15
WRC-1992 constitution diagram
Fillet weld computational factors from MIL-STD-1628A
DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.
Questions?
This work was funded by NSWC Carderock Division under the Naval Innovative
Science and Engineering (NISE) NDAA Section 219 program, managed by the NSWC
Carderock Division Director of Research
The software presented herein is intended as a reference, estimation, and comparison
tool. It is incumbent upon individual users to verify conformance of outputs to NAVSEA
directives. No liability is assumed by NAVSEA, NSWCCD, or their employees regarding
the use, output, or application of this software.
Acknowledgements
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