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2 2017

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Effect of High Humidity and Neutral Salt Mist on the Fatigue Service Life of T-Joints

Knysz V. V., Solovej S. A., Nyrkova L. I., Osadczuk S. A.

Biuletyn Instytutu Spawalnictwa w Gliwicach

2017

Vol. 61, No. 2

54--58

The article concerns the experimental testing of the long-lasting effect of surrounding environmental conditions (high air humidity and neutral salt mist) on the characteristics of the fatigue service life of T-joints in structures made of low-alloy steel 15HSND. The article-related research involved metallographic tests of the weld and of the heat affected zone (HAZ) of welded joints subjected to the 1200-hour long effect of humidity (in the G4 humidity chamber) and salt mist (in the KST-1 salt mist chamber). The metallographic tests made it possible to calculate the degree of corrosive effect and the entire area affected by corrosion, the depth of corrosion stain and corrosion pit penetration in the surface layer of the metal of the fillet welds and the HAZ of T-joints. The research also involved the identification of the characteristics of the fatigue service life of welded joints subjected to the long lasting effect of a corrosive environment.

Artykuł jest poświęcony badaniu eksperymentalnemu długotrwałego oddziaływania czynników klimatycznych środowiska otaczającego (podwyższonej wilgotności powietrza i obojętnej mgły solnej) na charakterystyki wytrzymałości zmęczeniowej złączy teowych konstrukcji metalowych z niskostopowej stali 15HSND. Przeprowadzono badania metalograficzne strefy spoiny i strefy wpływu ciepła (SWC) złączy spawanych poddanych oddziaływaniu w komorze wilgoci G4 i w komorze mgły solnej KST-1 w ciągu 1200 godzin. Na podstawie badań metalograficznych obliczono wartości stopnia porażenia korozyjnego i całkowity rozmiar rzutu powierzchni porażenia, głębokość wnikania plam i wżerów korozyjnych w warstwy powierzchniowe metalu spoin pachwinowych i SWC teowych złączy spawanych. Określono charakterystyki wytrzymałości zmęczeniowej połączeń spawanych przy długotrwałym oddziaływaniu środowiska korozyjnego.

Gases Emission From Surface Layers of Sand Moulds and Cores Stored Under the Humid Air Conditions

Kaźnica N., Zych J., Mocek J.

Archives of Foundry Engineering

2017

Vol. 17, iss. 4

79--84

A large number of defects of castings made in sand moulds is caused by gases. There are several sources of gases: gases emitted from moulds, cores or protective coatings during pouring and casting solidification; water in moulding sands; moisture adsorbed from surroundings due to atmospheric conditions changes. In investigations of gas volumetric emissions of moulding sands amounts of gases emitted from moulding sand were determined - up to now - in dependence of the applied binders, sand grains, protective coatings or alloys used for moulds pouring. The results of investigating gas volumetric emissions of thin-walled sand cores poured with liquid metal are presented in the hereby paper. They correspond to the surface layer in the mould work part, which is decisive for the surface quality of the obtained castings. In addition, cores were stored under conditions of a high air humidity, where due to large differences in humidity, the moisture - from surroundings - was adsorbed into the surface layer of the sand mould. Due to that, it was possible to asses the influence of the adsorbed moisture on the gas volumetric emission from moulds and cores surface layers by means of the new method of investigating the gas emission kinetics from thin moulding sand layers heated by liquid metal. The results of investigations of kinetics of the gas emission from moulding sands with furan and alkyd resins as well as with hydrated sodium silicate (water glass) are presented. Kinetics of gases emissions from these kinds of moulding sands poured with Al-Si alloy were compared.