Wyniki wyszukiwania - BazTech

1

Microstructural characteristics of a high-chromium cast iron hard-facing alloy

Fras Teresa, Koenig Benjamin, Meyer Paul P., Diop Ibra

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2025

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Vol. 73, nr 1

art. no. e151957

EN

Hard-facing alloys increase the service life of components exposed to abrasive, erosive, or metal-to-metal wear conditions. Hard-facing is a metalworking process in which layers of a harder material are arc-welded onto a base metal. In particular, high-chromium hard-face weld deposit layers form a strong metallurgical bond with the substrate steel plate, enhancing the resistance to abrasive loadings. Metallurgical and microstructural analysis is conducted to improve the performance of such bi-layered metal structures. The discussion of an HC-O hard-face alloy deposited on S235 steel substrate plates is presented here, focusing on the characterization of the coating microstructure. The study establishes the relationship among the chemical composition, ‘as-clad’ microstructure, and hardness properties of the investigated high chromium Fe – 27 wt.% Cr – 5 wt.% C hard-facing alloy.

2

Welding of 1.4462 duplex steel used in means of road transport

Szczucka-Lasota Bożena, Węgrzyn Tomasz

Zeszyty Naukowe. Transport / Politechnika Śląska

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2024

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z. 122

281--292

EN

Materials with good mechanical and chemical properties (materials should be resistant to various types of corrosion) are proposed for the various structures of means of transport. For this reason, high-alloy steels, including duplex steels, are increasingly used in the automotive industry. The 1.4462 duplex steel used in means of road transport steel could be treated as an interesting high-strength stainless material used in the automotive industry. Generally, duplex steels have a high resistance to localized and uniform corrosion. The duplex and superduplex steels are assumed to be rather proper weldable materials; however, cracks could be observed both in the heat-affected zone (HAZ) and in the weld. The article analyses the influence of tubular cored metal arc (136) with active gas shield welding (process 136) parameters on the arrangement of correct joints used in tanker truck elements, as an example of welding in the automotive sector. Various mechanical tests checking the properties of joints were realized. The goal of the paper is to choose the correct welding parameters for elements of 1.4462 steel. The construction elements of a tanker truck are made by the 136 method of welding.

3

Comparative Study of Metal-Mineral Abrasive Wear Resistance of Hardfacing Layers Produced Through Different Methods

Leszek Łatka, Karolina Płatek, Mirosław Szala, Piotr Koruba, Paweł Sokołowski, Jacek Reiner

Tribologia

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2024

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nr 1

89--98

EN

This article presents a comparison of the results of metal-mineral abrasion resistance investigations of hardfacing layers produced through different welding methods: (i) arc, (ii) plasma, and (iii) laser. Flux-cored wire with a metallic core (SK600-G) was used as a feedstock material. The work investigated the influence of basic hardfacing parameters on the geometry, microstructure, and correctness of making single beads . Then, full layers were made with the parameters selected for each method and abrasion resistance tests were carried out in accordance with the ASTM G65 standard. The obtained test results were analyzed for mechanical properties and microstructure of the produced padding welds. On the basis of the tests and analysis of the results, it was found that the use of methods with high energy density has a positive effect on the reduction in the coefficient of the share of the base material in the padding weld, while increasing the hardness. Comparative analysis of the resistance to metal-mineral abrasive wear showed that the resistance was approx. 25% higher for plasma layers and approx. 35% for laser layers, compared to electric arc-deposited layers.

PL

W artykule przedstawiono porównanie odporności na zużycie ścierne typu metal–minerał warstw napawanych różnymi metodami spawalniczymi: (i) łukowo, (ii) plazmowo oraz (iii) laserowo. Jako materiał dodatkowy zastosowano drut proszkowy z rdzeniem metalicznym (SK600-G). W pracy badano wpływ podstawowych parametrów napawania na geometrię, mikrostrukturę oraz poprawność wykonania pojedynczych ściegów. Następnie wykonano pełne warstwy wybranymi parametrami dla każdej z metod i przeprowadzono badania odporności na zużycie ścierne, zgodnie z normą ASTM G65. Uzyskane wyniki badań analizowano w kontekście własności mechanicznych oraz budowy mikrostrukturalnej wytworzonych napoin. Na podstawie analiz wyników badań stwierdzono, że zastosowanie metod o wysokiej gęstości energii korzystnie wpływa na redukcję współczynnika udziału materiału podłoża w napoinie, przy jednoczesnym wzroście twardości. Porównując odporność na zużycie ścierne typu metal–minerał zaobserwowano zmniejszone zużycie o ok. 25% dla napoin plazmowych oraz o ok. 35% dla napoin laserowych w porównaniu do napoin wykonanych metodą łukową.

4

Effects of storing flux-cored wires under various conditions

Świerczyńska Aleksandra, Landowski Michał, Wolski Adrian, Lentka Grzegorz, Łabanowski Jerzy, Fydrych Dariusz

Biuletyn Instytutu Spawalnictwa w Gliwicach

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2022

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Vol. 66, No. 6

37--45

EN

Welding processes involving the use of flux-cored wires are becoming increasingly popular, particularly in shipbuilding as well as in off-shore and civil engineering. The article presents characteristics of the welding process, its areas of application as well as advantages and disadvantages (e.g. necessity of ensuring appropriate conditions for the storage of filler metal wires). The satisfaction of quality-related requirements concerning welded joints necessitates controlling the quality of flux-cored wires as their condition (apart from welding conditions) is one of the most important factors affecting the welding process and the quality of joints. The analysis of related reference publications and individual study revealed that the storage of wires under conditions inconsistent with requirements specified by producers affects welding process stability and weld deposit properties. Visual tests (VT) tasked with assessing the quality of wire surface do not always provide sufficient information as regards the usability of filler metal wires in welding processes.