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Investigation of diffusible hydrogen content in drawn arc stud weld metal

  • Oliver BrätzEmail author
  • Knuth-Michael Henkel
Research Paper

Abstract

The fully mechanized drawn arc stud welding is a welding procedure for joining pin-shaped elements. In particular, it is an established joining technique for large studs in steel construction. The process is characterized by its high heat input due to high current and a weld pool protection realized by a ceramic ferrule holding the metal vapor as a shielding gas. Turbulences inside the ferrule during welding cause contaminations with atmospheric humidity. Furthermore, a high cooling rate results in a locally strongly hardened heat-affected zone and a considerable residual stress state in the parent material. Thus, there is a risk of enhanced hydrogen cracking susceptibility, especially for stud welding on high strength steels or under adverse welding conditions. An analysis procedure for determination of diffusible hydrogen content in drawn arc stud weld metal is presented in this article. This novel method is based on carrier gas hot extraction according to ISO 3690.

Keywords

Stud welding Carrier gas hot extraction Diffusible hydrogen Experimental design 

Notes

Acknowledgments

This work was made within the IGF research project 19.210 BG “Optimierung des Tragverhaltens unter Wasser gefügter Bolzenschweißverbindungen großer Dimensionen für Reparatur- und Instandhaltungsmaßnahmen” of the Research Association on Welding and Allied Processes of the DVS and has been funded by the AiF within the program for sponsorship by Industrial Joint Research (IGF) of the German Federal Ministry of Economic Affairs and Energy on the basis of a decision of the German Bundestag.

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Copyright information

© International Institute of Welding 2019

Authors and Affiliations

  1. 1.Fraunhofer Research Institution for Large Structures in Production Engineering IGPRostockGermany
  2. 2.Chair of Joining TechnologyUniversity of RostockRostockGermany

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