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Comparison of properties of Al-Cu soldered and resistance welded joints

Ambroziak Andrzej, Lange Artur, Białucki Piotr, Derlukiewicz Wiesław, Szymczak Eryk

Welding Technology Review

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2020

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R. 92, nr 2

25--32

EN

The paper presents the results of qualitative tests of Cu-Al joints made by soldering, brazing and resistance welding. Aluminum and copper tubes with a diameter of 6.9 mm, used, among others in refrigeration systems, were soldered with ZnAl2 and AlSi12 filler metal. In addition, similar connections were made by resistance welding. Macroscopic tests of soldered and welded joints were carried out and the hardness distribution on the cross-section of joints was determined. The analysis of research results allowed to state that resistance welding of Cu-Al joints can be a good alternative to the soldering process, especially in series production, due to the possibility of easy application of process mechanization.

PL

W pracy zamieszczono wyniki badań jakościowych złączy Cu-Al wykonanych metodami lutowania twardego i miękkiego oraz zgrzewania oporowego zwarciowego. Rurki aluminiowe i miedziane o średnicy 6,9 mm, stosowane m. in. w układach systemów chłodniczych lutowano spoiwem ZnAl2 oraz AlSi12. Ponadto wykonano podobne połączenia metodą zgrzewania oporowego. Przeprowadzono badania makroskopowe złączy lutowanych i zgrzewanych oraz określono rozkład twardości na przekroju złączy. Przeprowadzona analiza wyników badań pozwoliła na stwierdzenie, że zgrzewanie oporowe złączy Cu-Al może być dobrą alternatywą dla procesu lutowania zwłaszcza w produkcji seryjnej, z uwagi na możliwość łatwego zastosowania mechanizacji procesu.

2

Properties of new-generation hybrid layers combining hardfacing and nitriding dedicated to improvement in forging tools’ durability

Kaszuba Marcin, Widomski Paweł, Białucki Piotr, Lange Artur, Boryczko Bożena, Walczak Mariusz

Archives of Civil and Mechanical Engineering

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2020

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Vol. 20, no. 3

212--223

EN

This article deals with the subject of layers produced in a hybrid process combining hardfacing and nitriding. These layers are characterized by improved resistance to wear, which arises from the synergy between favorable materials during hardfacing and nitriding treatment. Tests were conducted on hot-work tool steel (H11) samples. Hardfaced layers consisting of three layers were applied to these samples, where layers were made from two materials-Robotool 46 and Hardface VMolc powder wires. Next, samples of both materials were nitrided using ZeroFlow gas nitriding technology, with control of potential aimed at obtaining a diffusion layer without a white zone of nitrides on the surface. The next step was to investigate the properties of hardfaced layers and of layers hardfaced after nitriding treatment. Conducted tests covered observations of the microstructure, microhardness measurements as a function of distance from the surface, measurement of stresses in the surface layer by means of X-ray diffraction, and tribological tests. Obtained test results show that hybrid layers combining hardfacing and nitriding may be suitable for improving the lifetime of tools applied in hot forging processes.

3

Properties of weld overlays on regenerated wheel hub of a mining vehicle

Ambroziak Andrzej, Lange Artur, Białucki Piotr, Kaczmarek Michał

Welding Technology Review

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2019

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R. 91, nr 4

69--77

EN

The paper presents problems related to the regeneration of wheel hubs for mining machinery vehicles carried out with arc welding using the MAG method. Hubs made of medium-carbon cast steel, type LII500, were weld surfaced with filler metal grade of G4Si. The tests were aimed at determining welding imperfections and metallographic properties of the surfacing welds. The influence of heat treatment on the properties of surfacing was investigated. Hardness distributions in welded hubs after various heat treatment operations were determined. Recommendations for the technology of weld surfacing the wheel hubs were formulated.

PL

W pracy przedstawiono problemy związane z regeneracją piast kół pojazdów maszyn górniczych realizowanych napawaniem łukowym metodą MAG. Piasty wykonane ze staliwa średnio węglowego gat. LII500 napawano spoiwem gat. G4Si1. Badania miały na celu określenie niezgodności spawalniczych oraz właściwości metalograficznych napoiny. Zbadano wpływ obróbki cieplnej na właściwości napoiny. Określono rozkłady twardości w napawanych piastach po różnych zabiegach obróbki cieplnej. Sformułowano zalecenia do technologii napawania piast.