Weld gap position detection based on eddy current methods with mismatch compensation

Svenman, Edvard,1969-Högskolan Väst,Avd för automationssystem,GKN Aerospace Sweden AB,PTW,GKN Aerospace, Sweden ; University West, Sweden (author)

The paper proposes a method for finding the accurate position of narrow gaps, intended for seam tracking applications. Laser beam welding of butt joints, with narrow gap and weld width, demand very accurate positioning to avoid serious and difficult to detect lack of fusion defects. Existing optical and mechanical gap trackers have problems with narrow gaps and surface finish. Eddy current probes can detect narrow gaps, but the accuracy is affected by mismatch in height above the surface on either side of the gap. In this paper a non-contact eddy-current method, suitable for robotic seam tracking, is proposed. The method is based on the resistive and inductive response of two absolute eddy current coils on either side of the gap to calculate a position compensated for height variations. Additionally, the method may be used to estimate the values of height and gap width, which is useful for weld parameter optimization. To investigate the response to variations in height, the method is tested on non-magnetic metals by scanning one commercially available eddy current probe across an adjustable gap and calculating the expected response for a two-probe configuration. Results for gap position are promising, while mismatch and gap width results need further investigation.

TEKNIK OCH TEKNOLOGIER Materialteknik Bearbetnings-, yt- och fogningsteknik hsv//swe
ENGINEERING AND TECHNOLOGY Materials Engineering Manufacturing, Surface and Joining Technology hsv//eng
laser welding
seam finding
inductive
eddy current
Production Technology
Produktionsteknik
Manufacturing and materials engineering
Produktions- och materialteknik

Rosell, AndersGKN Aerospace, Sweden ; Chalmers University of technology, Sweden (author)
Runnemalm, Anna,1970-Högskolan Väst,Avd för automationssystem,PTW,University West, Sweden(Swepub:his)runa (author)
Christiansson, Anna-Karin,1947-Högskolan Väst,Avd för automationssystem,PTW,University West, Sweden(Swepub:hv)takc (author)
Henrikson, PerGKN Aerospace, Sweden (author)
Högskolan VästAvd för automationssystem (creator_code:org_t)

In:Proceedings of JOM 18 International conference on joining materials, Helsingör, Danmark, april 26-29, 2015: JOM-institute, s. 1-9

By the author/editor: Svenman, Edvard, ...; Rosell, Anders; Runnemalm, Anna, ...; Christiansson, A ...; Henrikson, Per

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Materials Engine ...; and Manufacturing Su ...

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