Observation of the mechanisms causing two kinds of undercut during laser hybrid arc welding |
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Authors: | Jan Karlsson,Peter NormanAlexander F.H. Kaplan,Per RubinJavier Lamas,Armando Yañ ez |
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Affiliation: | a Luleå University of Technology, Dept. TVM, SE-971 87 Luleå, Sweden1 b Rubin-Materialteknik, Gullhönevägen 13 97596 Luleå, Sweden c Centro Tecnolóxico do Naval Galego, Ferrol 15590 (A Coruña), Spain d Centro de Investigacións Tecnolóxicas, Universidade da Coruña, Ferrol 15403 (A Coruña), Spain |
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Abstract: | Two different kinds of undercut were identified when laser hybrid welding hot rolled HSLA-steel in either the as-rolled condition or with the top surface mill scale removed. The presence of mill scale on the steel surface was found to give a sharp angled undercut combined with a sharp oxide inclusion at the edge of the weld which would have the same mechanical effect as a crack in this position. Removal of the surface oxides before welding resulted in the elimination of the oxide inclusions and a more rounded undercut geometry indicative of superior mechanical properties, particularly fatigue life. The mechanisms of the formation of both types of undercut have been analysed by high speed photography and SEM. |
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Keywords: | Laser hybrid arc welding Welding Undercut Melt flow Mill scale Oxide High speed imaging |
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