Enhanced Gap Classification in Laser Welding of Butt Joints Using Transfer Learning and Lightweight CNNs
Yongcui Mi, Fredrik Sikström, Morgan Nilsen, Antonio Ancona
Fredrik Sikström
Universitetslektor
Docent (Associate Professor)
Organisationstillhörighet
Anställd på Avdelningen för Industriautomation.Forskningsområde
Forskar inom teknik, elektroteknik och elektronik, produktionsteknik.Forskningsområde/forskningsintresse
Mitt forskningsområde är automation med speciell inriktning mot reglerteknik och processövervakning av svetsprocesser.
Undervisning/handledning
Jag undervisar maskin- och elkraftsingenjörer i reglerteknik samt maskiningenjörer i automatiseringsteknik. Jag handleder doktorander som biträdande handledare samt examinerar examensarbeten på kandidat och magisternivå.
Nyckelord
Svetsautomation, svetsövervakning, reglerteknik, systemidentifiering modellering.
Publikationer
Blind Calibration of Pyrometers for Press Hardening Industries with Process-Driven Constraints
Hakan Karasu, Amit Kumar Mishra, Rashid Ali, Fredrik Sikström, Yusuf Kucukyavuz, Michael Machhammer
Correlating melt pool geometry with temperature dynamics in laser directed energy deposition with wire : insights and industrial implications
Atieh Sahraeidolatkhaneh, Morgan Nilsen, Fredrik Sikström
Beam Offset Detection in Laser Stake Welding of T-Joints Using a Convolutional Neural Network
Morgan Nilsen, Yongcui Mi, Fredrik Sikström
Integrated vision-based seam tracking system for robotic laser welding of curved closed square butt joints
Morgan Nilsen, Fredrik Sikström
Improving laser directed energy deposition with wire feed-stock through beam shaping with a deformable mirror
Yongcui Mi, Fredrik Sikström, Luigi Angelastri, Pasquale Guglielmi, Gianfranco Palumbo, Antonio Ancona
Deep Learning for Joint Gap Width Classification and Tack Weld Detection in Laser Beam Welding
Yongcui Mi, Fredrik Sikström, Morgan Nilsen, Amit Kumar Mishra, Antonio Ancona
Multi sensor monitoring of the wire-melt pool interaction inhot-wire directed energy deposition using laser beam
Agnieszka Kisielewicz, Yongcui Mi, Fredrik Sikström, Antonio Ancona
Beam shaping with a deformable mirror for gap bridging in autogenous laser butt welding
Yongcui Mi, Pasquale Guglielmi, Morgan Nilsen, Fredrik Sikström, Gianfranco Palumbo, Antonio Ancona
Influence of laser-wire interaction on heat and metal transfer in directed energy deposition
Seyyed Mohammad Ali Noori Rahim Abadi, Yongcui Mi, Agnieszka Kisielewicz, Fredrik Sikström, Isabelle Choquet
Comparative study of the main electromagnetic models applied to melt pool prediction with gas metal arc : Effect on flow, ripples from drop impact, and geometry
Pradip Aryal, Fredrik Sikström, H. Nilsson, Isabelle Choquet
Conduction mode laser welding with beam shaping using a deformable mirror
Yongcui Mi, Satyapal Mahade, Fredrik Sikström, Isabelle Choquet, Shrikant V. Joshi, Antonio Ancona
Modelling of beam energy absorbed locally in conduction mode laser metal fusion
Seyyed Mohammad Ali Noori Rahim Abadi, Yongcui Mi, Fredrik Sikström, Isabelle Choquet
Hot-Wire Laser-Directed Energy Deposition : Process Characteristics and Benefits of Resistive Pre-Heating of the Feedstock Wire
Agnieszka Kisielewicz, Karthikeyan Thalavai Pandian, Daniel Sthen, Petter Hagqvist, María Asunción Valiente Bermejo, Fredrik Sikström, Antonio Ancona
In-process spectroscopic detection of chromium loss during Directed Energy Deposition of alloy 718
Agnieszka Kisielewicz, Esmaeil Sadeghi, Fredrik Sikström, Anna-Karin Christiansson, Gianfranco Palumbo, Antonio Ancona
Beam offset detection in laser stake welding of tee joints based on photodetector sensing
Fredrik Sikström, Morgan Nilsen
Adaptive control of the filler wire rate during laser beam welding of squared butt joints with varying gap width
Morgan Nilsen, Fredrik Sikström, Anna-Karin Christiansson
Robust vision-based joint tracking for laser welding of curved closed-square-butt joints
Morgan Nilsen, Fredrik Sikström, Anna-Karin Christiansson, Antonio Ancona
Detecting beam offsets in laser welding of closed-square-butt joints by wavelet analysis of an optical process signal
Arianna Elefante, Morgan Nilsen, Fredrik Sikström, Anna-Karin Christiansson, Tommaso Maggipinto, Antonio Ancona
Prediction of penetration in one-sided fillet welds by in-process joint gap monitoring : an experimental study
Fredrik Sikström, Anna Ericson Öberg
Barriers for industrial implementation of in-process monitoring of weld penetration for quality control
Anna Ericson Öberg, Fredrik Sikström
Evaluation of non-contact methods for joint tracking in a laser beam welding application
Fredrik Sikström, Anna Runnemalm, Patrik Broberg, Morgan Nilsen, Edvard Svenman
Operator bias in the estimation of arc efficiency in gas tungsten arc welding
Fredrik Sikström
Model based feedback control of gas tungsten arc welding : An experimental study
Fredrik Sikström, Anna-Karin Christiansson, Bengt Lennartson
Emissivity compensated spectral pyrometry-algorithm and sensitivity analysis
Petter Hagqvist, Fredrik Sikström, Anna-Karin Christiansson, Bengt Lennartson
Adaptive laser beam shaping with a deformable mirror for gap bridging in autogenous butt joint welding
Yongcui Mi, Fredrik Sikström, Morgan Nilsen, Isabelle Choquet, Antonio Ancona
Enhancing gap bridging in autogenous welding of butt joints with laser beam shaping using a deformable mirror
Yongcui Mi, Luigi Angelastri, Fredrik Sikström, Pasquale Guglielmi, Gianfranco Palumbo, Isabelle Choquet, Antonio Ancona
Influence of Substrate Preheating on Processing Dynamics and Microstructure of Alloy 718 Produced by Directed Energy Deposition Using a Laser Beam and Wire
Atieh Sahraeidolatkhaneh, Achmad Ariaseta, Gökçe Aydin, Morgan Nilsen, Fredrik Sikström
Real-Time Joint Gap Estimation in Laser Welding Using Computer Vision and Model-Based Techniques for Adaptive Control
Fredrik Sikström
A Novel Depth-Connected Region-Based Convolutional Neural Network for Small Defect Detection in Additive Manufacturing
Yiming Wang, Zidong Wang, Weibo Liu, Nianyin Zeng, Stanislao Lauria, Camilo Prieto, Fredrik Sikström, Hui Yu, Xiaohui Liu
In-situ Imaging for Temperature Estimation in Laser Directed Energy Deposition with Wire Feedstock Using a Convolutional Neural Network
Atieh Sahraeidolatkhaneh, Morgan Nilsen, Amit Kumar Mishra, Fredrik Sikström
A New Particle Swarm Optimization Algorithm for Outlier Detection : Industrial Data Clustering inWire Arc Additive Manufacturing
Jingzhong Fang, Zidong Wang, Weibo Liu, Stanislao Lauria, Nianyin Zeng, Camilo Prieto, Fredrik Sikström, Xiaohui Liu
System identification and closed-loop control of laser hot-wire directed energy deposition using the parameter-signature-quality modeling scheme
Mostafa Rahmani Dehaghani, Atieh Sahraeidolatkhaneh, Morgan Nilsen, Fredrik Sikström, Pouyan Sajadi, Yifan Tang, G. Gary Wang
Monitoring and control of directed energy deposition using a laser beam
Antonio Ancona, Fredrik Sikström, Anna-Karin Christiansson, Morgan Nilsen, Yongcui Mi, Agnieszka Kisielewicz
CFD-Based Feasibility Study of Laser-Directed Energy Deposition With a Metal Wire for On-Orbit Manufacturing
Seyyed Mohammad Ali Noori Rahim Abadi, P. Hagqvist, Fredrik Sikström, Isabelle Choquet
Beam Offset Detection in Laser Stake Welding of Tee Joints Using Machine Learning and Spectrometer Measurements
Aydin Jadidi, Yongcui Mi, Fredrik Sikström, Morgan Nilsen, Antonio Ancona
Effect of Substrate Orientation on Melt Pool during Multi-Layer Deposition in V-Groove with Gas Metal Arc
Pradip Aryal, Kjell Hurtig, Fredrik Sikström, Håkan Nilsson, Isabelle Choquet
Effect of shaped laser beam profiles on melt flow dynamics in conduction mode welding
Seyyed Mohammad Ali Noori Rahim Abadi, Yongcui Mi, Fredrik Sikström, Antonio Ancona, Isabelle Choquet
Influence of Laser Beam Shaping on Melt Pool Thermocapillary Flow
Seyyed Mohammad Ali Noori Rahim Abadi, Yongcui Mi, Fredrik Sikström, Isabelle Choquet
Vision based beam offset detection in laser stake welding of T-joints using a neural network
Yongcui Mi, Fredrik Sikström, Morgan Nilsen, Antonio Ancona
A study on change point detection methods applied to beam offset detection in laser welding
Morgan Nilsen, Fredrik Sikström, Anna-Karin Christiansson
Spectroscopic monitoring of laser blown powder directed energy deposition of Alloy 718
Agnieszka Kisielewicz, Fredrik Sikström, Anna-Karin Christiansson, Antonio Ancona
In-process Monitoring and Control of Robotized Laser Beam Welding of Closed Square Butt Joints
Morgan Nilsen, Fredrik Sikström, Anna-Karin Christiansson, Antonio Ancona
Monitoring of Varying Joint Gap Width During Laser Beam Welding by a Dual Vision and Spectroscopic Sensing System
Morgan Nilsen, Fredrik Sikström, Anna-Karin Christiansson, Antonio Ancona
Vision and spectroscopic sensing for joint tracing in narrow gap laser butt welding
Morgan Nilsen, Fredrik Sikström, Anna-Karin Christiansson, Antonio Ancona
Joint tracking in zero gap laser beam welding using a vision sensor
Morgan Nilsen, Fredrik Sikström, Anna Karin Christiansson
Vision systems for in‐process monitoring of laser beam welding
Fredrik Sikström, Morgan Nilsen
Monitoring of laser beam welding by a non-intrusive optical sensor system using photodiodes
Morgan Nilsen, Fredrik Sikström
Optical Methods for In-Process Monitoring of Laser Beam Welding
Fredrik Sikström, Morgan Nilsen, Ingemar Eriksson
Emissivity compensated spectral pyrometry for varying emissivity metallic measurands
Petter Hagqvist, Fredrik Sikström, Anna-Karin Christiansson, Bengt Lennartson
Forskningsprojekt