Veröffentlichungen
Assesment of Advanced MIG/MAG and TIG Welding Processes (EN)
Art der Abschlussarbeit
Master
Autoren
- Sende, Martin
Betreuer
- Prof. Dr.-Ing. habil. Uwe Füssel
- Dr.-Ing. Michael Schnick
Weitere Betreuer
Geoff Melton, TWI UK
Abstract
In this diploma thesis, an independent assessment of recent developments in MIG/MAG and TIG welding is provided. In addition to a literature review, a survey was conducted to identify the users’ awareness of recent developments in MIG/MAG and TIG welding equipment and to gain knowledge about their experience with these technologies. It was found that there is a great number of new and mostly manufacturer specific variants, which all claim to be better than the conventional process in one way or another. To provide a better overview of these process developments, a systematisation was developed. Therefore, the processes’ operation principles and the objectives were categorised. Because for MIG/MAG dip transfer especially, a great number of manufacturer specific process variants were found, the experimental work was focussed on the four most widely known modified short-arc processes. The electrical waveforms of theses variants were analysed and different control mechanisms were investigated. Lap welds were made in 1.5 mm thick mild steel sheets, with a variable gap introduced between the sheets to simulate variation in fit-up. Especially in the efficiency of spatter prevention, significant differences were found. Moreover, the applicability of stability indices was investigated and the calculation methods of heat input by mean and instantaneous values were compared. For the welding task given, no significant differences in true heat input were found, when comparing the controlled short-arc processes with conventional dip transfer. While the gap bridging ability was investigated to be similar for all controlled short-arc processes, it was found to be slightly higher for the conventional dip transfer process. However, suggestions are made for further improvements. Results and observations, such as spatter occurrence, gap bridging ability and ease of adjustment, were summarised.
Zugeordnete Forschungsschwerpunkte
- Schweißen
Schlagwörter
MIG, MAG, TIG, Assesment
Berichtsjahr
2011