Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Model based compensation of systematic errors in an inductive gap measurement method
Högskolan Väst, Institutionen för ingenjörsvetenskap, Forskningsmiljön produktionsteknik(PTW). GKN Aerospace Engine Systems. (PTW)ORCID-id: 0000-0003-3697-1995
Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för produktionssystem (PS). (PTW)ORCID-id: 0000-0001-6933-375X
2017 (Engelska)Ingår i: Measurement : Journal of the International Measurement Confederation, ISSN 0263-2241, Vol. 105, s. 17-24Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

This paper presents an improvement to a recently presented inductive gap measurement method, using a model to reduce systematic errors. Gap measurement is important in laser keyhole welding, where the laser beam and the resulting weld seam are very narrow, requiring high precision in alignment and gap preparation. The previously reported method for gap measurement uses one inductive coil on each side of the gap, each measuring distance to the gap and lift off above a plate, to estimate the position, width and alignment of the gap in a square butt joint. The method can detect zero width gap and shows position error less than 0.1 mm, but gap width and alignment measurement suffer from systematic errors. The improvement is based on a model that is designed to describe these systematic errors as functions of the gap dimensions. The model relies on observations of experimental data, and is calibrated to a small set of measurements. Using the model with the initial estimate of the gap dimensions to compensate the coil measurements, an improved estimate of the gap dimensions can be calculated. The errors in the compensated results are within 0.1 mm except for gap width, which still suffers from the effect of combined gap width and misalignment.

Ort, förlag, år, upplaga, sidor
Elsevier, 2017. Vol. 105, s. 17-24
Nyckelord [en]
Seam tracking, inductive, complex response, zero gap, laser beam welding, error compensation
Nationell ämneskategori
Bearbetnings-, yt- och fogningsteknik
Forskningsämne
Produktionsteknik; TEKNIK, Produktions- och materialteknik
Identifikatorer
URN: urn:nbn:se:hv:diva-10148DOI: 10.1016/j.measurement.2017.03.043ISI: 000401378400003Scopus ID: 2-s2.0-85017174867OAI: oai:DiVA.org:hv-10148DiVA, id: diva2:1047298
Forskningsfinansiär
KK-stiftelsen
Anmärkning

Ingår i lic. uppsats

Tillgänglig från: 2016-11-17 Skapad: 2016-11-17 Senast uppdaterad: 2019-12-05Bibliografiskt granskad
Ingår i avhandling
1. Inductive measurement of narrow gaps for high precision welding of square butt joints
Öppna denna publikation i ny flik eller fönster >>Inductive measurement of narrow gaps for high precision welding of square butt joints
2016 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

A recent method in aero engine production is to fabricate components from smaller pieces, rather than machining them from large castings. This has made laser beam welding popular, offering high precision with low heat input and distortion, but also high productivity. At the same time, the demand for automation of production has increased, to ensure high quality and consistent results. In turn, the need for sensors to monitor and control the laser welding process is increasing. In laser beam welding without filler material, the gap between the parts to be joined must be narrow. Optical sensors are often used to measure the gap, but with precise machining, it may become so narrow that it is difficult to detect, with the risk of welding in the wrong position. This kind of problems can cause severe welding defects, where the parts are only partially joined without any visible indication. This thesis proposes the use of an inductive sensor with coils on either side of the gap. Inducing currents into the metal, such a sensor can detect even gaps that are not visible. The new feature of the proposal is based on using the complex response of each coil separately to measure the distance and height on both sides of the gap, rather than an imbalance from the absolute voltage of each coil related to gap position. This extra information allows measurement of gap width and misalignment as well as position, and decreases the influence from gap misalignment to the position measurement. The sensor needs to be calibrated with a certain gap width and height alignment. In real use,these will vary, causing the sensor to be less accurate. Using initial estimates ofthe gap parameters from the basic sensor, a model of the response can be used to estimate the measurement error of each coil, which in turn can be used for compensation to improve the measurement of the gap properties.The properties of the new method have been examined experimentally, using a precise traverse mechanism to record single coil responses in a working range around a variable dimension gap, and then using these responses to simulate a two coil probe. In most cases errors in the measurement of weld gap position and dimensions are within 0.1 mm.The probe is designed to be mounted close to the parts to be welded, and will work in a range of about 1 mm to each side and height above the plates. This is an improvement over previous inductive sensors, that needed to be guided to the mid of the gap by a servo mechanism.

Ort, förlag, år, upplaga, sidor
Trollhättan: University West, 2016. s. 48
Serie
Licentiate Thesis: University West ; 14
Nyckelord
Eddy current, Seam tracking, Measurement, Laser beam welding
Nationell ämneskategori
Bearbetnings-, yt- och fogningsteknik
Forskningsämne
Produktionsteknik; TEKNIK, Produktions- och materialteknik
Identifikatorer
urn:nbn:se:hv:diva-10150 (URN)978-91-87531-45-3 (ISBN)978-91-87531-44-6 (ISBN)
Presentation
2016-11-28, C118, Högskolan Väst, Trollhättan, 10:15
Handledare
Tillgänglig från: 2016-11-21 Skapad: 2016-11-17 Senast uppdaterad: 2019-12-03Bibliografiskt granskad
2. An inductive gap measurement method for square butt joints
Öppna denna publikation i ny flik eller fönster >>An inductive gap measurement method for square butt joints
2019 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

A recent method in aero engine production is to fabricate components from smaller pieces, rather than machining them from large castings. This has made laser beam welding popular, offering high precision with low heat input and distortion, but also high productivity. At the same time, the demand for automation of production has increased, to ensure high quality and consistent results. In turn, the need for sensors to monitor and control the laser welding process is increasing. In laser beam welding without filler material, the gap between the parts to be joined must be narrow. Optical sensors are often used to measure the gap, but with precise machining, it may become so narrow that it is difficult to detect, with the risk of welding in the wrong position. This thesis proposes the use of an inductive sensor with coils on either side of the gap. Inducing currents into the metal, such a sensor can detect even gaps that are not visible. The new feature of the proposal is based on using the complex response of each coil separately to measure the distance and height on both sides of the gap, rather than an imbalance from the absolute voltage of each coil related to gap position. This extra information allows measurement of gap width and alignment as well as position in a working range of about 1 mm around the gap, and decreases the influence from variation in gap alignment to the position measurement. The sensor needs to be calibrated with a certain gap width and height alignment. In real use, these will vary, causing the sensor to be less accurate. Using initial estimates of the gap parameters from the basic sensor, a model ofthe response can be used to estimate the measurement error of each coil, whichin turn can be used for compensation to improve the measurement of the gap properties. The properties of the new method have been examined experimentally, using aprecise traverse mechanism to record single coil responses in a working range around a variable dimension gap, and then using these responses to simulate atwo coil probe. In most cases errors in the measurement of weld gap position and dimensions are within 0.1 mm. Different coil orientations were studied using numerical simulation, and validated in experiments using a two coil probe. The influence of scratches, chamfers and variation in plate thickness was investigated at different frequencies.

Ort, förlag, år, upplaga, sidor
Trollhättan: University West, 2019. s. 60
Serie
PhD Thesis: University West ; 30
Nyckelord
Eddy current; Seam tracking; Measurement; Laser beam welding; gap geometry
Nationell ämneskategori
Bearbetnings-, yt- och fogningsteknik
Forskningsämne
Produktionsteknik; TEKNIK, Produktions- och materialteknik
Identifikatorer
urn:nbn:se:hv:diva-13841 (URN)978-91-88847-33-1 (ISBN)978-91-88847-32-4 (ISBN)
Disputation
2019-05-28, F104 Albertssalen, Högskolan Väst, Trollhättan, 10:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2019-05-10 Skapad: 2019-05-10 Senast uppdaterad: 2019-12-10Bibliografiskt granskad

Open Access i DiVA

Fulltext saknas i DiVA

Övriga länkar

Förlagets fulltextScopus

Person

Svenman, EdvardRunnemalm, Anna

Sök vidare i DiVA

Av författaren/redaktören
Svenman, EdvardRunnemalm, Anna
Av organisationen
Forskningsmiljön produktionsteknik(PTW)Avdelningen för produktionssystem (PS)
Bearbetnings-, yt- och fogningsteknik

Sök vidare utanför DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetricpoäng

doi
urn-nbn
Totalt: 288 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf