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In this work are given the testing results of mechanical properties welded joints and microstructure of micro alloyed steel as well as its sensitivity to lamellar cracks appearance. The obtained results show that steel has good resistance to lamellar cracks appearance and with an appropriate wire choice for welding, a good combination of mechanical properties could be obtained at room (ambience) temperatures as well as at low temperatures. [ABSTRACT FROM AUTHOR]

In this paper, we will present our investigation of the quality of J55 microalloyed steel welds that were formed by a basic flux-cored wire electrodes that were of appropriate quality and alloyed with Ni and Mo. Based on the comparison and analysis of the obtained results related to the testing of the chemical composition, mechanical properties, toughness at test temperatures, and the microstructure of welding joints formed by a classic and specially coated rutile flux-cored electrode, we assessed the justification to switch from solid wire electrodes to flux-cored alloyed wire electrodes of appropriate quality. The research aim for the application of flux-cored wire electrodes instead of solid wire electrodes is based on the advantages pertaining to a flux-cored wire: molten metal from electrode wire is transferred in the form of fine droplets, easy welding and maximum productivity within all spatial positions related to welding, improved properties of welding joints, and increased productivity when compared to a classic solid wire. Our research encompasses the development of the experimental production at the Research and Development Center IHIS Belgrade (Development Institute for Chemical Power Sources), Serbia, of the new type of a coated electrode with improved welding properties when compared to a classic electrode intended for microalloyed steel welding., Competing Interests: The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript; or in the decision to publish the results.

A gradual manifestation first of parathyroid and then od thyroid and adrenal endocrinopathy in 38-year old female patient, with the syndrome of Multiple Endocrine Neoplasia (MEN) type IIa--Sippl syndrome, is presented. The first diagnosis was hyperparathyroidism, which is unusual in this syndrome, as only a half of the patients affected with MEN IIa have hyperparathyroidism. The diagnosis of medullary thyroid carcinoma is operatively established. The syndrome is diagnosed after the manifestation of the clinical signs of pheochromocytoma. This syndrome is hereditary in autosomal and dominant way. Our patient is the first member in the risk family: the family medical history of our patient was negative. As this syndrome can appear in the age range from 2-67, we intend to make the screening of all the members of the patient's family.