Browsing by Subject "diffusible hydrogen"

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Access status: Open Access ,
Determination of diffusible hydrogen content in the deposited metal of rutile electrodes by the glycerin method
(2013) Fydrych, Dariusz Marek; Tomków, Jacek; Świerczyńska, Aleksandra
The presence of diffusible hydrogen in welded joints is one of the causes of formation the welding imperfections. Improvement of weldability can be achieved by reducing the hydrogen amount in welded joints. This requires, among others, the finding of sources of hydrogen. For high hydrogen processes the commonly used method of determining the diffusible hydrogen amount is the glycerin method. This paper concerns issues related to the test procedure and the possibility to control the diffusible hydrogen amount in deposited metal.
Access status: Open Access ,
Diffusible hydrogen content in the deposited metal of multilayer welded joints
(2014) Fydrych, Dariusz Marek; Świerczyńska, Aleksandra; Rogalski, Grzegorz
This article describes the manufacturing technology of multilayer joints in terms of controlling the diffusible hydrogen content. The diffusible hydrogen content in deposited metal for multilayer welded joints made of covered rutile electrodes or covered cellulosic and basic electrodes was determined. It was found that, after four beads, the diffusible hydrogen content decreases from 36 m l/100 g to 18 ml/100 g in the ca se of the first technology, and about 40 ml/100 g to a level of 12 ml/100 g in the second. The explanation of the mechanisms responsible for this phenomenon and direction s for further study have been proposed.
Access status: Open Access ,
Preliminary studies of seamless flux-cored wires stored in extreme conditions
(2014) Fydrych, Dariusz Marek; Świerczyńska, Aleksandra; Landowski, Michał Karol
In this paper, we describe the preliminary experimental studies of flux-cored wires moisturized under controlled conditions. Three seamless wires of different grades have been placed in an environmental chamber and moisturized in extremely adverse conditions (temperature T = 60°C, relative humidity H = 90%) for 240 hours. During this time, measurements of weight gain as well as surface observations of the wires have been carried out. Also, the amount of diffusible hydrogen in deposited metal was determined by the mercury method for one of the moisturized wires. A significant increase in the level of hydrogen was observed (from H5 to H10). Further research will aim to determine the effect of storage conditions on the hydrogenation of deposited metal and quality of flux-cored wires.