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Open AccessArticle

Induction Weld Seam Characterization of Continuously Roll Formed TRIP690 Tubes

School of Engineering, College of Engineering and Physical Sciences, University of Guelph, Guelph, ON N1G 2W1, Canada
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Metals 2020, 10(4), 425; https://doi.org/10.3390/met10040425
Received: 5 March 2020 / Revised: 17 March 2020 / Accepted: 20 March 2020 / Published: 25 March 2020
(This article belongs to the Special Issue Joining of Advanced High Strength Steels for the Automotive Industry)
The weld seam characteristics of continuously roll formed and induction seam welded TRIP690 tubes were examined in this work. These tube are subsequently used in automotive hydroforming applications, where the weld seam characteristics are critical. The induction seam welds are created through a solid-state welding process and it was shown that by increasing the induction frequency by 26%, the weld seam width within the heat affected zone (HAZ) reduced due to a plateau in the hardness distribution which was a result of a delay in the transformation of martensite. 2D hardness distribution contours were also created to show that some of the weld conditions examined in this work resulted in a strong asymmetric hardness distribution throughout the weld, which may be undesirable from a performance perspective. An increase in the pressure roll force was also examined and revealed that a wider total weld seam width was produced likely due to an increase in temperature which resulted in more austenitization of the sheet edge prior to welding. The ring hoop tension test (RHTT) was applied to the tube sections created in this work. A Tensile and Notch style ring specimen were tested and revealed excellent performance for these welds due to high peak loads (~17.2 kN) for the Notch specimens (force deformation within weld) and lower peak loads (~15.2 kN) for the Tensile specimens for which fracture occurred in the base metal. View Full-Text
Keywords: induction welding; roll forming; TRIP690; metallography; microhardness testing; ring hoop tension test induction welding; roll forming; TRIP690; metallography; microhardness testing; ring hoop tension test
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Bardelcik, A.; Ananthapillai, B.T. Induction Weld Seam Characterization of Continuously Roll Formed TRIP690 Tubes. Metals 2020, 10, 425.

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