Wyniki wyszukiwania - BazTech

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Doświadczalna ocena oddziaływania polowych zjawisk elektromagnetycznych na spawacza pracującego w metodzie SMAW w polaryzacjach DCEN oraz DCEP

Krupski Piotr, Michałowska Joanna

Przegląd Elektrotechniczny

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2022

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R. 98, nr 12

217--220

PL

Wpływy pól elektromagnetycznych na organizmy ludzkie są obecnie popularnym kierunkiem badań w licznych ośrodkach naukowych na całym świecie. W artykule podjęto tematykę empirycznej oceny odziaływania polowych zjawisk elektromagnetycznych na spawacza wykonującego prace spawalnicze w metodzie 111. Badania zostały przeprowadzone z myślą o odwzorowaniu, warunków w jakich pracują spawalnicy – montażyści. Szacuje się, że wśród metod spawania łukowego ponad połowa prac światowych jest wykonywana właśnie w tej metodzie. Przeprowadzono pomiary składowej elektrycznej i magnetycznej pola elektromagnetycznego, na które narażona jest pochylona głowa spawacza oraz narządy wewnątrz klatki piersiowej. Pomiary pola powtórzono dla polaryzacji DCEP oraz DCEN. Wyniki poddano analizie statystycznej i odniesiono do aktualnie obowiązujących aktów prawnych.

EN

The effects of electromagnetic fields on human organisms are now a popular area of research in numerous research centers around the world. The article deals with the subject of the empirical assessment of the impact of electromagnetic field phenomena on a welder performing welding works in the method SMAW. The research was carried out with a view to reproducing the conditions in which welders - assemblers work. It is estimated that among the arc welding methods, more than half of the world washes are made with this method. Measurements of the electrical and magnetic components of the electromagnetic field to which the welder's inclined head and organs inside the chest are exposed were carried out. The EMC measurements were repeated for the polarization of DCEP and DCEN. Respecting the stochastic nature of the results, they were subjected to statistical analysis and compared to the currently binding norms contained in law regulations.

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Influence of stick electrode coating’s moisture content on the diffusible hydrogen in underwater wet shielded metal arc welding

Klett J., Hassel T.

Advances in Materials Science

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2020

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Vol. 20, nr 4(66)

27--37

EN

In shielded metal arc welding, the major factors influencing hydrogen uptake into the weld metal are (i) the hydrogen content of the base metal, (ii) hydrogen input by the welding consumable, and (iii) the hydrogen introduced by the atmosphere surrounding the arc process. In this study, the relative contribution of these factors is investigated and compared to each other for the case of underwater wet shielded metal arc welding. To assess the influence of the stick electrode’s moisture (capillary introduced water during handling operations) on the diffusible hydrogen in wet welded samples, wet and dry electrodes were welded at four different water depths. The moisture was absorbed through the sharpened electrode tip only, to ensure close to service conditions. The results show that the moist stick electrode coatings lead to 22.6% higher average diffusible hydrogen content in the weld metal (0.5 m water depth an average). However, the effect disappears with increasing water depths (no difference in 60 m water depth).

3

Effect of Mn and Mo on the quality of welding trucks steel supporting structures

Węgrzyn T., Burdzik R.

Journal of Achievements in Materials and Manufacturing Engineering

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2010

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Vol. 43, nr 1

276--279

EN

Purpose: The aims of the research are studies safety and exploitation conditions of weld structure reparation of car body truck frames. Design/methodology/approach: Structure of car body truck frames are the main object of the research. Impact toughness, fatigue properties were measured, fractographic analyses were made. Subject scopes are experimental research about weld structure reparation of car body truck frames. Theoretical calculations should be used as the hint automotive welding reparations. Findings: Optimization of operational properties of steel welded structures might be done in terms of the chemical composition (amount Mo, Mn) in WMD. Molybdenum should be treated as the element very positively influencing impact toughness and fatigue properties of low alloy WMD. The cause of damages and deformation of steel car body frame structures is often connected with no proper choice of welding materials, their joining technology, and chemical composition of WMD. Research limitations/implications: Studies on the effect of other important alloying elements on the properties of the frame of a vehicle should be continued. Practical implications: Practical implications might be improving of the passive safety of the vehicle by quality of the car structures reparations. Originality/value: A novelty is the analysis of the impact of major alloying elements in the weld on the quality of repair structural components of the vehicle.