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Haglund, Peter
Publications (3 of 3) Show all publications
Haglund, P., Frostevarg, J., Powell, J., Eriksson, I. & Kaplan, A. (2018). Holographic measurement of distortion during laser melting: Additive distortion from overlapping pulses. Optics and Laser Technology, 100, 1-6
Open this publication in new window or tab >>Holographic measurement of distortion during laser melting: Additive distortion from overlapping pulses
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2018 (English)In: Optics and Laser Technology, ISSN 0030-3992, E-ISSN 1879-2545, Vol. 100, p. 1-6Article in journal (Refereed) Published
Abstract [en]

Laser - material interactions such as welding, heat treatment and thermal bending generate thermal gradients which give rise to thermal stresses and strains which often result in a permanent distortion of the heated object. This paper investigates the thermal distortion response which results from pulsed laser surface melting of a stainless steel sheet. Pulsed holography has been used to accurately monitor, in real time, the out-of-plane distortion of stainless steel samples melted on one face by with both single and multiple laser pulses. It has been shown that surface melting by additional laser pulses increases the out of plane distortion of the sample without significantly increasing the melt depth. The distortion differences between the primary pulse and subsequent pulses has also been analysed for fully and partially overlapping laser pulses.

Place, publisher, year, edition, pages
Elsevier, 2018
National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
urn:nbn:se:ltu:diva-66009 (URN)10.1016/j.optlastec.2017.09.053 (DOI)000417669700001 ()2-s2.0-85030758159 (Scopus ID)
Note

Validerad;2017;Nivå 2;2017-10 -09 (andbra)

Available from: 2017-10-09 Created: 2017-10-09 Last updated: 2017-12-28Bibliographically approved
Haglund, P., Eriksson, I., Powell, J. & Kaplan, A. (2013). Surface tension stabilized laser welding (donut laser welding): A new laser welding technique (ed.). Paper presented at . Journal of laser applications, 25(3)
Open this publication in new window or tab >>Surface tension stabilized laser welding (donut laser welding): A new laser welding technique
2013 (English)In: Journal of laser applications, ISSN 1042-346X, E-ISSN 1938-1387, Vol. 25, no 3Article in journal (Refereed) Published
Abstract [en]

A new laser welding process is presented which delivers a porosity free, spatter free weld. The process involves a donut shaped melt with a central hole of the same order of magnitude as the material thickness. The laser illuminates only the leading section of this melt. The hole is kept open by the melt surface tension.

National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
urn:nbn:se:ltu:diva-13697 (URN)10.2351/1.4798219 (DOI)000322535700001 ()2-s2.0-84877247296 (Scopus ID)cf936747-f126-4872-a25f-84616458ee4d (Local ID)cf936747-f126-4872-a25f-84616458ee4d (Archive number)cf936747-f126-4872-a25f-84616458ee4d (OAI)
Note
Validerad; 2013; 20130416 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Eriksson, I., Haglund, P., Powell, J., Sjödahl, M. & Kaplan, A. (2012). Holographic measurement of thermal distortion during laser spot welding (ed.). Paper presented at . Optical Engineering: The Journal of SPIE, 51(3)
Open this publication in new window or tab >>Holographic measurement of thermal distortion during laser spot welding
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2012 (English)In: Optical Engineering: The Journal of SPIE, ISSN 0091-3286, E-ISSN 1560-2303, Vol. 51, no 3Article in journal (Refereed) Published
Abstract [en]

Welding distortion is an important engineering topic for simulation and modeling, and there is a need for experimental verification of such models by experimental studies. High-speed pulsed digital holography is proposed as a measurement technique for out-of-plane welding distortion. To demonstrate the capability of this technique, measurements from a laser spot weld are presented. A complete twodimensional deformation map with submicrometer accuracy was acquired at a rate of 1000 measurements per second. From this map, particular points of interest can be extracted for analysis of the temporal development of the final distortion geometry.

National Category
Manufacturing, Surface and Joining Technology Applied Mechanics
Research subject
Manufacturing Systems Engineering; Experimental Mechanics
Identifiers
urn:nbn:se:ltu:diva-10878 (URN)10.1117/1.OE.51.3.030501 (DOI)000302780500002 ()2-s2.0-84858667516 (Scopus ID)9c2d5f12-1aa9-4ef8-970c-caa818a3b92c (Local ID)9c2d5f12-1aa9-4ef8-970c-caa818a3b92c (Archive number)9c2d5f12-1aa9-4ef8-970c-caa818a3b92c (OAI)
Note
Validerad; 2012; 20120410 (ingeri)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
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