TY - GEN

T1 - Systematic investigation into wet arc welding under water with covered stick electrodes

AU - Hassel, Thomas

AU - Hecht-Linowitzki, Vitali

AU - Kussike, Sven Martin

AU - Rehfeldt, Dietrich

AU - Bach, Friedrich Wilhelm

PY - 2015

Y1 - 2015

N2 - At the Institute for Materials Science at the University of Hanover, research is being carried out into the field of the welding filler materials for wet arc welding under water. To this end, reproducible welding tests are performed in an internal hyperbaric chamber with the aid of an automatic multiaxis welding machine. In this respect, the ambient conditions such as the temperature, the salt content and the pressure/water depth (up to max. 30 bar/300 m simulated water depth) can be adjusted to those in reality. The percentages by mass of the covering components (kaolin, cellulose, chalk, quartz and ferromanganese) as well as the water-repellent protective varnish were varied on the basis of a rutile-covered stick electrode. Investigations were conducted into the influences of these variations depending on the water depth. With the aid of the "Analysator Hannover" (AH) system and the "AH Data Evaluation & Management System" (AH DEM), the stochastic process signals were recorded, evaluated and correlated with the conventionally determined mechanical-technological properties and structural compositions. The findings obtained in this case can be utilised, amongst other purposes, in order to raise the process quality of manual metal arc welding under water. The objective of these developments is to extend the application of the wet welding process to fine-grained and higher- strength steels which are often used in modern structures in inland and offshore areas. With regard to the repair of offshore installations and their foundation structures, it is indispensable to know the influence of the water depth on the welding process in order to establish appropriate underwater stick electrodes [1; 2].

AB - At the Institute for Materials Science at the University of Hanover, research is being carried out into the field of the welding filler materials for wet arc welding under water. To this end, reproducible welding tests are performed in an internal hyperbaric chamber with the aid of an automatic multiaxis welding machine. In this respect, the ambient conditions such as the temperature, the salt content and the pressure/water depth (up to max. 30 bar/300 m simulated water depth) can be adjusted to those in reality. The percentages by mass of the covering components (kaolin, cellulose, chalk, quartz and ferromanganese) as well as the water-repellent protective varnish were varied on the basis of a rutile-covered stick electrode. Investigations were conducted into the influences of these variations depending on the water depth. With the aid of the "Analysator Hannover" (AH) system and the "AH Data Evaluation & Management System" (AH DEM), the stochastic process signals were recorded, evaluated and correlated with the conventionally determined mechanical-technological properties and structural compositions. The findings obtained in this case can be utilised, amongst other purposes, in order to raise the process quality of manual metal arc welding under water. The objective of these developments is to extend the application of the wet welding process to fine-grained and higher- strength steels which are often used in modern structures in inland and offshore areas. With regard to the repair of offshore installations and their foundation structures, it is indispensable to know the influence of the water depth on the welding process in order to establish appropriate underwater stick electrodes [1; 2].

UR - http://www.scopus.com/inward/record.url?scp=84925378844&partnerID=8YFLogxK

M3 - Contribution in non-scientific journal

AN - SCOPUS:84925378844

VL - 14

SP - 48

EP - 53

JO - Welding and Cutting

JF - Welding and Cutting

SN - 1612-3433

ER -