Stability of welding
Author
Andersen, Jesper N.
Term
7. term
Education
Publication year
2011
Submitted on
2011-01-06
Pages
87
Abstract
This bachelor thesis examines the stability of Gas Metal Arc Welding (GMA‑W) in short‑circuit transfer, focusing on measuring and assessing short‑circuit frequency as an indicator of process stability. Data were acquired on an industrial Migatronic Galaxy system with a welding robot and processed in Matlab, where a time‑domain period method was applied and compared with a frequency‑domain approach using the Welch Power Spectral Density (PSD). The analysis also derived duty cycle and used statistical measures, including standard deviation, to estimate stability. It proved difficult to obtain clear results with the PSD approach, whereas the period method yielded clearer and more usable short‑circuit frequency estimates. Among the tested settings, the most stable weld observed was one that did not go through the material. The report further discusses practical choices such as window and overlap in PSD computation and the method’s suitability for monitoring and potential control of the welding process.
Denne bacheloropgave undersøger stabiliteten af Gas Metal Arc Welding (GMA‑W) i kortslutningstransfer med fokus på at måle og vurdere kortslutningsfrekvensen som indikator for processtabilitet. Data blev indsamlet på en industrielt anvendt Migatronic Galaxy-maskine med svejserobot og behandlet i Matlab, hvor både periodemetoden (tidsdomæne) og en frekvensdomæne-tilgang via Welch Power Spectral Density (PSD) blev anvendt og sammenlignet. Analysen omfattede også udledning af duty cycle og brug af statistiske mål, herunder standardafvigelse, til at estimere stabilitet. Det viste sig vanskeligt at opnå entydige resultater med PSD-tilgangen, mens periodemetoden gav mere klare og anvendelige mål for kortslutningsfrekvensen. Inden for de undersøgte indstillinger fremstod den mest stabile svejsning som en, der ikke gik igennem materialet. Rapporten diskuterer desuden praktiske valg som vindue og overlap i PSD-beregningen samt metodens anvendelighed i forbindelse med overvågning og mulig styring af svejseprocessen.
[This apstract has been generated with the help of AI directly from the project full text]