Publications by authors named "B PLONKA"
Article Synopsis
- Extrusion welding of AlMgSi(Cu) alloys using porthole dies creates hollow shapes with seam welds, but improper alloy composition or conditions can weaken the weld's strength compared to the base material.
- Predictive modeling of welding conditions based on alloy composition, temperature, and pressures streamlines porthole die design, reducing necessary testing and production costs.
- Laboratory tests on two AlMgSi(Cu) alloy compositions showed that optimal welding at 550°C and 350 MPa resulted in significant weld strength, with the highest relative weld strength recorded at 87% for one alloy.
Before artificial ageing, extruded aluminium profiles are subjected to stretching with a small cold deformation in the range of 0.5-2%. This deformation improves the geometrical stability of the extruded product and causes changes in the microstructure of the profile, which leads to the strain hardening of the material after artificial ageing.
View Article and Find Full Text PDFAnimal tumors serve as reasonable models for human cancers. Both human and animal tumors often reveal triplet EPR signals of nitrosylhemoglobin (HbNO) as an effect of nitric oxide formation in tumor tissue, where NO is complexed by Hb. In search of factors determining the appearance of nitrosylhemoglobin (HbNO) in solid tumors, we compared the intensities of electron paramagnetic resonance (EPR) signals of various iron-nitrosyl complexes detectable in tumor tissues, in the presence and absence of excess exogenous iron(II) and diethyldithiocarbamate (DETC).
View Article and Find Full Text PDFThe study presents the results of research on the influence of different contents of main alloying additions, such as Mg (2 ÷ 2.5 wt.%), Cu (1.
View Article and Find Full Text PDFArticle Synopsis
- * The research focused on three variations of 7021 aluminum alloy and evaluated weldability at temperatures of 400, 450, and 500 °C under a pressure of 300 MPa.
- * Results showed that high-strength welds (96-101% of non-welded material strength) can be achieved by optimizing alloy composition, die construction, and deformation conditions during industrial extrusion trials.