The effects of welding heat input on the usability of high strength steels in welded structures
Pirinen, Markku (2013-05-25)
Väitöskirja
Pirinen, Markku
25.05.2013
Lappeenranta University of Technology
Acta Universitatis Lappeenrantaensis
Julkaisun pysyvä osoite on
https://urn.fi/URN:ISBN:978-952-265-400-7
https://urn.fi/URN:ISBN:978-952-265-400-7
Tiivistelmä
High strength steel (HSS) has been in use in workshops since the 1980s. At
that time, the significance of the term HSS differed from the modern conception
as the maximum yield strength of HSSs has increased nearly every year. There
are three different ways to make HSS. The first and oldest method is QT
(quenched and tempered) followed by the TMCP (thermomechanical controlled
process) and DQ (direct quenching) methods.
This thesis consists of two parts, the first of which part introduces the research
topic and discusses welded HSS structures by characterizing the most
important variables. In the second part of the thesis, the usability of welded HSS
structures is examined through a set of laboratory tests.
The results of this study explain the differences in the usability of the welded
HSSs made by the three different methods. The results additionally indicate that
usage of different HSSs in the welded structures presumes that manufacturers
know what kind of HSS they are welding. As manufacturers use greater
strength HSSs in welded structures, the demands for welding rise as well. Therefore, during the manufacturing process, factors such as heat input, cooling
time, weld quality, and more must be under careful observation.
that time, the significance of the term HSS differed from the modern conception
as the maximum yield strength of HSSs has increased nearly every year. There
are three different ways to make HSS. The first and oldest method is QT
(quenched and tempered) followed by the TMCP (thermomechanical controlled
process) and DQ (direct quenching) methods.
This thesis consists of two parts, the first of which part introduces the research
topic and discusses welded HSS structures by characterizing the most
important variables. In the second part of the thesis, the usability of welded HSS
structures is examined through a set of laboratory tests.
The results of this study explain the differences in the usability of the welded
HSSs made by the three different methods. The results additionally indicate that
usage of different HSSs in the welded structures presumes that manufacturers
know what kind of HSS they are welding. As manufacturers use greater
strength HSSs in welded structures, the demands for welding rise as well. Therefore, during the manufacturing process, factors such as heat input, cooling
time, weld quality, and more must be under careful observation.
Kokoelmat
- Väitöskirjat [1105]