DIFFUSIBLE HYDROGEN CONTENT IN DEPOSITED METAL OF MULTILAYER WELDED JOINTS

The article describes manufacturing technology of multilayer joints in terms of control the diffusible hydrogen content. 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 in the case of the first technology from 36 ml/100 g to 18 ml/100 g while in the second of about 40 ml/100 g to a level of 12 ml/100 g. The explanation of the mechanisms responsible for this phenomenon and directions for further study were proposed

PRELIMINARY STUDIES OF SEAMLESS FLUX CORED WIRES STORED IN EXTREME CONDITIONS

In the paper preliminary experimental studies of flux cored wires moisturized under controlled conditions are described. Three seamless wires of different grades have been placed in 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 and observations of surface of wires have been carried out. Also diffusible hydrogen amount in deposited metal has been determined by mercury method for one of moisturized wire. Significant increase of hydrogen level was observed (from H5 to H10 level). Further research will be aimed on determination of the effect of storage conditions on hydrogenation of deposited metal and quality of flux cored wires

DETERMINATION OF DIFFUSIBLE HYDROGEN CONTENT IN THE DEPOSITED METAL OF RUTILE ELECTRODES BY THE GLYCERIN METHOD

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 sourcesof 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

Diffusible hydrogen content in the deposited metal of multilayer welded joints Zawartość wodoru dyfundującego w stopiwie wielościegowych złączy spawanych /

Tyt. z nagłówka.Bibliografia s. 228-[229].W artykule scharakteryzowano technologię wytwarzania złączy wielościegowych w aspekcie kontroli ilości wodoru dyfundującego. Oznaczono zawartość wodoru dyfundującego w stopiwie dla wielościegowych złączy spawanych wykonanych dwoma technologiami: za pomocą elektrod o otulinie rutylowej oraz celulozowej i zasadowej. Ustalono, że po wykonaniu czterech ściegów ilość wodoru dyfundującego spada w przypadku pierwszej technologii z poziomu36 ml/100 g do 18 ml/100 g, natomiast w drugim z około 40 ml/100 g do poziomu 12 ml/100 g. Wyjaśniono mechanizmy odpowiedzialne za to zjawisko i zasugerowano kierunki kontynuacji badań.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.Dostępny również w formie drukowanej.SŁOWA KLUCZOWE: wodór dyfundujący, spawanie elektrodami otulonymi, elektrody rutylowe, elektrody celulozowe, elektrody zasadowe. KEYWORDS: diffusible hydrogen, manual metal arc welding, rutile electrodes, cellulosic electrodes, basic electrodes

Determination of diffusible hydrogen content in the deposited metal of rutile electrodes by glycerin method Oznaczanie ilości wodoru dyfundującego w stopiwie elektrod rutylowych metodą glicerynową /

Tyt. z nagłówka.Bibliogr. s. [54].Obecność wodoru dyfundującego w złączach spawanych jest jedną z przyczyn powstawania niezgodności spawalniczych. Poprawę spawalności stali można osiągnąć przez zmniejszenie nawodorowania złączy. Wymaga to m.in. wyznaczenia źródeł wodoru. W procesach wysokowodorowych często stosowaną metodą oznaczania ilości wodoru dyfundującego jest metoda glicerynowa. Praca dotyczy zagadnień związanych z procedurą badawczą i możliwością sterowania ilością wodoru dyfundującego w stopiwie.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.Dostępny również w formie drukowanej.SŁOWA KLUCZOWE: wodór dyfundujący, elektrody rutylowe, metoda glicerynowa. KEYWORDS: diffusible hydrogen, rutile electrode, glycerin method

Underwater Processing of Materials

Technological processes carried out in the water environment include the production and processing of engineering materials and giving them specific properties [...

Underwater Wet Repair Welding of API 5L X65M Pipeline Steel

This paper presents results of the research of effect of polymer insulation of pipeline made of API 5L X65M steel as well as underwater wet welding parameters on properties of joints made by covered electrodes. Effect of heat input on structure and hardness of joints during repair of underwater pipeline was analyzed. Welding defects like microcracks, micro-lacks of fusion, slag inclusions, as well as HAZ hardness increase over an assumed acceptance criterion for welded joints in pipes without anticorrosion polymer insulation, were identified. A significant effect of polimer insulation on structure and properties of welded joints, was found

Bead-On-Plate Welding on S235JR Steel by Underwater Local Dry Chamber Process

The article presents the results of the effect of parameters of underwater local dry chamber welding on the properties of padding welds. The effect of heat input and the type of shielding gas on the structure and hardness of welds was established. the functions for estimating the maximum hardness of the heat affected zone have been also elaborate