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Denzler, A. och Henrikson, J. (2014) Development of GMAW consumable test method. Göteborg : Chalmers University of Technology (Diploma work - Department of Materials and Manufacturing Technology, Chalmers University of Technology, nr: 130).
BibTeX
@mastersthesis{
Denzler2014,
author={Denzler, Anton and Henrikson, Jonas},
title={Development of GMAW consumable test method},
abstract={This project investigates the possibility to find measurable values based on the current and
voltage characteristics of the GMAW, Gas Metal Arc Welding, process that may be correlated
to process parameters and/or geometrical measurements of weld beads. Such quantites may
have the potential to replace or complement existing subjective and qualitative charcterisation
and validation methods of the welding process. Existing characterisation methods of the
performance of welding consumables consist, at least partly, of an experienced
welder/engineer that uses his/her experience to evaluate the welding process. Finding other
more objective and quantitative measures that correlates to aspects of the welding process
may enable more systematic and efficient methods of development and validation of welding
consumbles. Also, a replacement of manual welding with automated welding may further
contribute to the efficiency of the methods.
This work will focus on two aspects during two experiments. The first experiment performed
aimed on deriving possible quantitative measurables from the I/U characteristics from welds
acquired with varying voltage and wire feed speed. An automated GMAW process were used.
The I/U data was then analysed in a computer software to find possible characteristic
measurables, which have the potential of correlating to the welding process. Examples of
calculated characteristic quantities are; amount of short-circuiting, quantities from Fourier
transformation analysis and deviation in current, voltage and power. A discussion are made
about how these aspects of the I/U characteristic are linked to the process and different
transfer modes. The I/U characteristics analysis revealed that some of the calculated
characteristic quantities showed possible trends or indications of correlations to the weld
process. The Fourier transformation showed a unexpected peak in the frequency span of 300-
900 Hz, which could be of future interest but it needs further analysis to draw any
conclusions.
In the second experiment, a number fillet welds were made in order to demonstrate the
effectiveness and stabillity of the automated setup. These welds are also made with varying
wire feed speed and voltage with an automated GMAW process. Geometry measurements
were performed on the weld bead profile, in terms of throat thickness, leg length, penetration,
etc. The result from the geometrical measurements and their correlation with the input
parameters are shown to be in good agreement with theory and the automated setup being
promising as a standard method for consumable characterisation.},
publisher={Institutionen för material- och tillverkningsteknik, Chalmers tekniska högskola},
place={Göteborg},
year={2014},
series={Diploma work - Department of Materials and Manufacturing Technology, Chalmers University of Technology, no: 130},
keywords={Automated GMAW, I/U characteristics, MIG/MAG Welding},
note={75},
}
RefWorks
RT Generic
SR Electronic
ID 219132
A1 Denzler, Anton
A1 Henrikson, Jonas
T1 Development of GMAW consumable test method
T2 An analysis of I/U-characteristics and automated welding, regarding new quantifying measurables and stability
YR 2014
AB This project investigates the possibility to find measurable values based on the current and
voltage characteristics of the GMAW, Gas Metal Arc Welding, process that may be correlated
to process parameters and/or geometrical measurements of weld beads. Such quantites may
have the potential to replace or complement existing subjective and qualitative charcterisation
and validation methods of the welding process. Existing characterisation methods of the
performance of welding consumables consist, at least partly, of an experienced
welder/engineer that uses his/her experience to evaluate the welding process. Finding other
more objective and quantitative measures that correlates to aspects of the welding process
may enable more systematic and efficient methods of development and validation of welding
consumbles. Also, a replacement of manual welding with automated welding may further
contribute to the efficiency of the methods.
This work will focus on two aspects during two experiments. The first experiment performed
aimed on deriving possible quantitative measurables from the I/U characteristics from welds
acquired with varying voltage and wire feed speed. An automated GMAW process were used.
The I/U data was then analysed in a computer software to find possible characteristic
measurables, which have the potential of correlating to the welding process. Examples of
calculated characteristic quantities are; amount of short-circuiting, quantities from Fourier
transformation analysis and deviation in current, voltage and power. A discussion are made
about how these aspects of the I/U characteristic are linked to the process and different
transfer modes. The I/U characteristics analysis revealed that some of the calculated
characteristic quantities showed possible trends or indications of correlations to the weld
process. The Fourier transformation showed a unexpected peak in the frequency span of 300-
900 Hz, which could be of future interest but it needs further analysis to draw any
conclusions.
In the second experiment, a number fillet welds were made in order to demonstrate the
effectiveness and stabillity of the automated setup. These welds are also made with varying
wire feed speed and voltage with an automated GMAW process. Geometry measurements
were performed on the weld bead profile, in terms of throat thickness, leg length, penetration,
etc. The result from the geometrical measurements and their correlation with the input
parameters are shown to be in good agreement with theory and the automated setup being
promising as a standard method for consumable characterisation.
PB Institutionen för material- och tillverkningsteknik, Chalmers tekniska högskola,PB Institutionen för material- och tillverkningsteknik, Chalmers tekniska högskola,
T3 Diploma work - Department of Materials and Manufacturing Technology, Chalmers University of Technology, no: 130
LA eng
LK http://publications.lib.chalmers.se/records/fulltext/219132/219132.pdf
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