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Laser re-melting to remove weld cap undercuts
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
Department of Materials Engineering, Tarbiat Modares University.
Number of Authors: 2
2016 (English)Conference paper (Refereed)
Abstract [en]

Undercuts in welded components are known as a stress raiser that reduces fatigue life, a well-known origin for construction failures. If fatigue life is increased, many components will have longer service time, preventing wasting of resources for repairing or re-building. Undercuts form when conditions for welding are bad, generally due to dilutes in the weld zone, bad shielding gas, arc properties or too high welding speeds leading to premature cooling of weld gouge edges. These conditions may result in poor wetting at the melt pool rim, preventing the melt from reaching the base plate surface. Sometimes undercuts are not at all tolerated by industrial requirements, such as for flat steel extension welding where the surface needs to be flat. In these cases post weld treatment is required. The here proposed solution is a technique of laser re-melting laser hybrid arc weld caps in order to remove occurring undercuts and even out weld caps and roots. In this case, the same laser used for welding can also be used in a second run but defocussed. This technique is advantageous to techniques such as TIG dressing since the equipment is already present. After the focused laser has been in conjunction with an arc to produce an approved weld, except for including irregular weld bead or undercutting, the laser is used again in a defocussed position to re-melt the weld cap. The wider but shallower weld surface created has redistributed the melt cap in order to fill the occasional undercuts and surface irregularities.

Place, publisher, year, edition, pages
2016.
National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-60430OAI: oai:DiVA.org:ltu-60430DiVA: diva2:1046822
Conference
69th IIW Annual Assembly and International Conference, Melbourne, 10–15 July 2016
Available from: 2016-11-15 Created: 2016-11-15 Last updated: 2016-11-29Bibliographically approved

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Frostevarg, Jan
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