Hybrid laser-arc welding of thick-walled pipe segments with optimization of the end crater
| Autor: | Andrey Gumenyuk, Ömer Üstündağ, Michael Rethmeier, Sergej Gook |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0209 industrial biotechnology
Beam diameter Materials science business.industry Physics::Optics 02 engineering and technology Welding 010501 environmental sciences Laser 01 natural sciences Physics::Geophysics law.invention Lens (optics) Arc (geometry) 020901 industrial engineering & automation Optics Impact crater law Physics::Accelerator Physics General Earth and Planetary Sciences Laser power scaling Arc welding business 0105 earth and related environmental sciences General Environmental Science |
| Zdroj: | Procedia CIRP. 94:676-679 |
| ISSN: | 2212-8271 |
| DOI: | 10.1016/j.procir.2020.09.106 |
| Popis: | The study deals with the application of the high-power hybrid-laser arc welding process on up to 15 mm thick pipe segments with the intention to avoid end crater imperfections during closing of the circumferential welds, where the pipes were turned during welding in 1G- and 2G-positions. Different techniques such as laser power ramp-down, abrupt switch-off of the laser power and change of the magnification of the laser spot diameter and defocusing of the laser beam relative to the workpiece were tested to remove the laser energy from the process. It could be shown that a high defocusing of the optic system above 40 mm with a resulting beam diameter > 2.9 mm in a short overlap length of approx. 20 mm leads to the formation of a cup-shaped weld seam, which is preferred for avoidance of cracks and pores in the end crater. A laser optics with motor-driven lens system was used for the welding experiments to defocuse the laser beam without changing the position of the arc. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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