A5046164004- Welding Techniques and Residual Stresses
- Laser and Thermal Forming Techniques
- Microstructure and Mechanical Properties of Steels
- Laser Material Processing Techniques
- Additive Manufacturing Materials and Processes
- Advanced Fiber Optic Sensors
- Aluminum Alloy Microstructure Properties
- Advanced Welding Techniques Analysis
- Metal Alloys Wear and Properties
- Engineering Applied Research
- Photonic Crystal and Fiber Optics
- Advancements in Materials Engineering
Lappeenranta-Lahti University of Technology
2007-2018
Bremen Institute for Applied Beam Technology
2007-2010
This paper focuses on high power fiber laser welding of steel material for the field pipe production. X65 and X70 plate in thicknesses 9.5 mm 14 was welded with laser-GMA-hybrid processes a maximum 8 kW. Two different filler wires joint preparations were tested their weldability. Relating to these procedures thicknesses, characterisation samples such as hardness, tensile testing Charpy V-notch carried out results will be reported this paper.
Laser welding of thick plates in production environments is one the main applications high power lasers; however, process has certain limitations. The small spot size focused beam produces welds with depth-to-width aspect ratio but at times fails to provide sufficient reinforcement because poor gap bridging ability. results shipbuilding steel AH36 thickness 8 mm as a single-sided T-joint using 10 kW fiber laser are presented and discussed this research paper. Three optical setups fibers 200...
Oscillation of the laser beam has been applied to achieve a positive influence on efficiency welding process and quality weld seam. In this work 10 kW from fiber was oscillated with frequencies up 1000 Hz for bead plate welds in 15 mm thick structural steel investigate oscillation geometrical dimensions The transversally given amplitude each frequency. parameter set be varied power, speed focal point position according highest formation seam process. results obtained show that lower range...
Laser welding and laser-GMA-hybrid using 8 kW, 20 kW 30 fiber lasers was investigated. Steel plates from low alloyed steel (e.g. pipeline X65) having a thickness of 16 mm up to 28 were joined under various conditions. Single layer as well multi hybrid investigated for different seam preparation types. Butt welds types Y-welds have been tested. The air gap the edge misalignment varied intentionally investigate process window it is also intended use in rough environment. Different phenomena...
Laser welding of aluminium is high interest among the industrial production. Light weight, good corrosion and mechanical properties make very important material. High reflectivity thermal conductivity, vapour pressure alloying elements as well low liquid surface tension ionisation potential, laser its alloys a demanding task. Problems that occur during are mainly caused by process instabilities keyhole melt pool, increased plasma formation above pool loss elements. These problems lead to...
An empirical study on laser beam welding of T-joints in 6 mm structural steel has been investigated. The role power density formation the weld geometry and resulting microstructures studied. Autogenous is seldom first choice production floor environment over laser-arc hybrid because high sensitivity to joint gap fluctuations. Without alloying elements filler wire, microstructure dependent only thermal cycle process. Exceptional brightness fiber process stability at levels open new...