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Welding in the World

, Volume 60, Issue 4, pp 703–711 | Cite as

Analysis of the submerged arc in comparison between a pulsed and non-pulsed process

  • U. Reisgen
  • J. Schäfer
  • K. Willms
Research Paper

Abstract

The submerged-arc welding process has several advantages, e.g., a high deposition rate and a high surface quality. Due to the fact that the arc is burning in a weld cavity, which is formed under a flux blanket and slag, the droplet detachment and the arc behavior in the cavity are not quite clear. Therefore, the conditions under the influence of a pulsed and non-pulsed submerged-arc welding (SAW) process are observed and compared with one another. By using experimental setups and different techniques based on high-speed technology and pressure measurements of the cavity, an intended changing of the cavity size between a pulsed and non-pulsed process can be observed. The results can be detected by high-speed videos taken with a frame rate of 20,000 fps through glass panes, which expose the cavity on one side and through ceramic tubes, which make a connection with the cavity either in welding direction or perpendicular to the welding direction for a short time. Additionally, pressure measurements of the cavity give evidence of a changing size in the cavity by using a pulsed process. Analysis of the videos shows a free droplet detachment without any contact of the droplet with the cavity wall. The welds are carried out using high-strength fine-grained structural steels, which are continuously gaining in importance and therefore are often used in current construction applications. The SAW process has economical advantages, however, with a risk of hydrogen diffusion. Therefore, the knowledge of the cavity size and the droplet conditions are of great interest.

Keywords (IIW Thesaurus)

Submerged arc welding Spray transfer High strength steels Imaging 

Notes

Acknowledgments

This research work was supported by the “Industrielle Gemeinschaftsforschung IGF/AiF” with the reference number 17.351N and the German Research Foundation DFG within the Cluster of Excellence “Integrative Production Technology for High-Wage Countries.” The authors would like to express their thanks for the support.

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Copyright information

© International Institute of Welding 2016

Authors and Affiliations

  1. 1.ISF-Welding and Joining InstituteRWTH Aachen UniversityAachenGermany

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