Making of an artistic piece usually includes a number of different technologies. It implies that for understanding of eventually present irregularities one should knows a lot of technical details. Brazing tehnology is one of them, inspection of integrity, also. Brazing technology generally has evolved on empirical manner, mainly by trial and error(s). The basic difficulty in this technology is that the real situation is highly complex due to the presence of large number of variables, some of them may not be easy to recognize. The great problem is the appearance of crack(s) in postcleaning periode, i.e after brazing is finished, it means over years or decades. A good braze joint must be both physically and chemically bounded. One of the available method for investigation is radiographic testing, when the thickness of testing components commonly does not represents a problem. Here provided radiographic testing has revealed the existence of some indications only at leaves. The indications usualy mean discontinuity in material homogenity. Penetrant testing is a next step for investigation of surface. Registration of indications and their locations are necessary steps in any further approach for removing such discontinuities. Choosing the repair method always is particular problem, however in entire technique, especially on sensitive artistic component(s). Every action in repairing or restauration may led to more or less visible traces. Unadequate actions may permanently change the appearance or usage of treated artefact. Here is shown one irregularity (crack) at one brazed leaf from an artistic desk lamp.
Inovativna tehnologija laserskog čišćenja različitih površina u industriji, uključuje integrisani pristup kontrole procesa interakcije laser-materijal i ispitivanja rezultata laserskog delovanja. Lasersko čišćenje ima značajne prednosti u odnosu na klasične metode čišćenja: ima veliku selektivnost, preciznost, efikasnost i pouzdanost u primeni kod različitih vrsta materijala. Termalna priroda procesa laserskog čišćenja unosi određeni rizik po predmete čišćenja, te su istraživanja optimizacije procesa u fokusu interesovanja velikog broja naučnika. U radu su prikazani rezultati laserskog čišćenja boje na bakarnoj površini i zaštitnog sloja na štampanoj pločici. Kontrola procesa laserskog čišćenja u realnom vremenu je vršena pomoću infracrvene kamere. Mikromorfološke promene čišćene površine su ispitivani optičkom mikroskopijom.
The pa per pres ents a brief over view of con tem po rary ELION tech niques with stress on their use for ma te rial mod i fi ca tion and do sim e try. In the at tempt to avoid some com mon mis judges of ir ra di a tion ef fects, spe cial at ten tion is paid to ex act def i ni tion of ir ra di a tion ge om e try and care ful ad just ment of dose rates, which en able a proper elab o ra tion of ex per i men tal re sults. In par tic u lar, ef fects of grays ir ra di a tion on prop er ties of com mer cial op ti cal fibres, split ters, con nec tors, and fi bre joints are ex am ined, which en ables mon i tor ing of ir ra di a tion ef fects in com plex con fig u ra tions made of ma te ri als with dif fer ent ra di a tion hard ness (re sis tance). It has been es tab lished that grays ir ra di a tion of the in ves ti gated el e ments in flu ences, in dif ferent ways, the trans mis sion of la ser beam sig nals of var i ous wave lengths, un der dif fer ent modu la tion re gimes. Af ter ir ra di a tion, the sig nal at ten u a tion is no tice ably larger, both in op ti cal con nec tors and op ti cal split ter, than be fore it, and the ef fect in creases in time. The ef fects are more pro nounced at the 99 % than at the 1 % Y-split ter out put at both mea sured wave lengths, and are more pro nounced at 1310 nm than at 1550 nm.
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