Laser-arc hybrid welding from the designer point of view
No Thumbnail Available
URL
Journal Title
Journal ISSN
Volume Title
Helsinki University of Technology |
Diplomityö
Checking the digitized thesis and permission for publishing
Instructions for the author
Instructions for the author
Authors
Date
2009
Department
Major/Subject
Koneensuunnitteluoppi
Mcode
Kon-41
Degree programme
Language
en
Pages
94
Series
Abstract
This master's thesis was made for Rautaruukki Oyj. Rautaruukki Oyj has started a wide research program called Rlaser that focuses on laser technology. Hybrid welding has also an essential role in the Rlaser research program. This master's thesis was a part of the Rlaser research program. The area of research for this master's thesis was constrained by researching only structural steel S355 and material thicknesses of 3 to 10 mm. The purpose of the theory part was to establish a link between the welding process, the design of the welded products and the quality control process. In the experimental part of this thesis cost structures of welded parts and welding distortions were investigated. The cost structure of arc welded products was investigated based on production. The cost structure of the laser and laser MAG hybrid welded products were estimated theoretically. Welding tests were made to examine welding distortions and welding of ready-machined parts. The estimated manufacturing cost were the lowest for the laser MAG hybrid welded products. The reasons for the lower costs of laser and laser MAG hybrid welding were deeper penetration with one welding run and small amount of finishing work required after welding compared to arc welding. The difference in laser MAG hybrid welding's favor when compared to laser welding is the gap bridging ability. It gives more freedom in the accuracy of the part manufacturing. The welding tests revealed that laser and laser MAG hybrid welding had quite similar welding distortion values and that in arc welding distortions were duple. The welding tests of ready-machined parts gave good results with laser welding. Laser MAG hybrid welding of ready-machined parts was not possible to test with the available welding machine. Future research with real products is needed to prove this master's thesis conclusions to be right. The welding tests show that hybrid welding is a suitable welding process for the plate thicknesses of 3 to 10 mm.Description
Supervisor
Ekman, KaleviThesis advisor
Siltanen, JukkaKeywords
laser MAG hybrid welding, cost structure of welded products, welding distortions, quality management of laser MAG hybrid welding