{"id":30660,"date":"2019-06-04T14:54:05","date_gmt":"2019-06-04T12:54:05","guid":{"rendered":"http:\/\/136.144.181.85\/~nedzink\/info-si-sfaturi\/ghid-de-procesare-si-instalare\/cositorirea\/"},"modified":"2019-06-04T14:54:05","modified_gmt":"2019-06-04T12:54:05","slug":"cositorirea","status":"publish","type":"page","link":"https:\/\/www.nedzink.com\/ro\/cositorirea\/","title":{"rendered":"Cositorirea"},"content":{"rendered":"<p>Exist\u0103 o diferen\u0163\u0103 de &icirc;mbinare prin cositorire a zincului NedZink Natural, zincului &icirc;nvechit (patinat) \u015fi a zincului pre-patinat NOVA sau NOIR.<\/p>\n<h2 class=\"western\">Cositorirea zincului nou<\/h2>\n<p>Cositorirea trebuie efectuat\u0103 de preferat &icirc;n atelier. Dac\u0103 acest lucru nu este posibil sau nu este viabil din punct de vedere economic, atunci cositorirea se face &icirc;n \u015fantier. Cositorirea trebuie efectuat\u0103 &icirc;ntr-un mod &icirc;n care aceasta s\u0103 curg\u0103 continuu, iar suprapunerea minim\u0103 va fi de:<\/p>\n<ul>\n<li>4-5 mm pentru &icirc;mbin\u0103ri prin cositorire ale capacelor de jgheab, burlanelor sau accesoriilor acestora<\/li>\n<li>10 mm pentru &icirc;mbinari orizontale sau &icirc;nclinate<\/li>\n<\/ul>\n<h3>Ciocanul de lipit<\/h3>\n<p>La cositorire se va folosi un ciocan de lipit cu o greutate minima de 500 grame, de preferat 750 grame, la temperatura corect\u0103 (250-400&deg;). Pentru cositorirea &icirc;mbinarilor de zinc, folosirea unui ciocan cu cap plat de l\u0103\u0163ime 10-15 mm d\u0103 cele mai bune rezultate. &Icirc;n unele cazuri sau &icirc;n zone greu accesibile este necesar\u0103 folosirea unui ciocan de sudur\u0103 de o alt\u0103 form\u0103, cu o greutate minim\u0103 de 350 grame \u015fi cu cap de l\u0103\u0163ime minim\u0103 de 5 mm.<\/p>\n<p>Pentru forma ciocanului vezi Figura 1.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.nedzink.com\/wp-content\/uploads\/import\/cms\/userfiles\/images\/tz2abb_english.jpg\" style=\"border-width: 0px; border-style: solid; width: 632px; height: 434px;\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;O &icirc;mbinare cositorit\u0103 cu un ciocan de cositorire la temperatura corect\u0103 are un aspect perfect \u0219i uniform. &Icirc;n acest caz, efectul capilar este optim.<\/p>\n<h2 class=\"western\">Cositorirea zincului vechi<\/h2>\n<p>Diferen\u0163a dintre cositorirea zincului vechi \u015fi a zincului nou este dat\u0103 de prezen\u0163a pe tabla de zinc a stratului de patin\u0103 rezultat din poluare \u015fi oxidare. Pentru realizarea unei lipituri rezistente, suprapunerile ce urmeaz\u0103 a fi sudate trebuie cur\u0103\u021bate temeinic \u015fi restaurat\u0103 str\u0103lucirea metalic\u0103 specific\u0103 zincului nou. Acest lucru se poate realiza prin r\u0103zuire sau \u0219mirgheluire. Dac\u0103 exist\u0103 vreun dubiu asupra calit\u0103\u0163ii suprafe\u0163ei se aplic\u0103 o sudur\u0103 pe p\u0103r\u0163ile care trebuie sudate &icirc;nainte de a efectua sudura final\u0103. Petele negre indic\u0103 locurile care nu au fost atinse de sudur\u0103. Se cur\u0103\u0163\u0103 din nou aceste locuri \u015fi se sudeaz\u0103 din nou. Dup\u0103 aceast\u0103 etap\u0103 se aplic\u0103 solu\u0163ia de flux \u015fi aliajul de lipit, conform indica\u0163iilor prezentate anterior.<\/p>\n<h3>Cositorirea cu flux<\/h3>\n<p>Pe pia\u0163\u0103 exist\u0103 mul\u021bi produc\u0103tori ce ofer\u0103 solu\u0163ii flux pentru cositorirea adecvat\u0103 a titan-zincului, care pot produce rezultate bune. Se recomand\u0103 utilizarea cositoririi sub strat de flux at&acirc;t pentru zincul vechi c&acirc;t \u015fi pentru cel nou sau pentru NedZink&nbsp;&reg; NOVA.<\/p>\n<p>Cositoririle cu flux trebuie s\u0103 aib\u0103 urm\u0103toarele propriet\u0103\u0163i:<\/p>\n<ol>\n<li>dup\u0103 cositorire, zincul va fi slab sau deloc corodat<\/li>\n<li>nu produce vapori nocivi<\/li>\n<li>reziduurile fluxului pot fi u\u015for &icirc;ndep\u0103rtate<\/li>\n<li>nu cauzeaz\u0103 rugin\u0103 pe scule<\/li>\n<\/ol>\n<p>Este recomandat &icirc;n mod deosebit sa nu se lucreze cu acid clorhidric amestecat sau nu cu solu\u0163ie de flux deoarece poate d\u0103una s\u0103n\u0103t\u0103\u0163ii muncitorilor, sculelor sau tablei de titan-zinc. &Icirc;nainte de aplicarea solu\u0163iei de flux, suprafa\u0163a zincului trebuie s\u0103 fie cur\u0103\u0163at\u0103, iar &icirc;mbinarea care trebuie lipit\u0103 trebuie sa fie corect &icirc;nchis\u0103.<\/p>\n<p>Distan\u0163a maxim\u0103 permis\u0103 &icirc;ntre tablele ce urmeaz\u0103 a fi cositorite este de 0.5mm. Dup\u0103 finalizarea lipiturii, &icirc;mbin\u0103rile trebuie cur\u0103\u0163ate c&acirc;t mai rapid posibil cu un burete umed sau carp\u0103 umed\u0103.<\/p>\n<h3>Cositorul<\/h3>\n<p>Pentru sudarea zincului recomand\u0103m urm\u0103toarele dou\u0103 aliaje:<\/p>\n<ol>\n<li>Staniu\/ plumb, 50\/50, slab &icirc;n stibiu, gam\u0103 de topire 183-216 &deg;C.<\/li>\n<li>Staniu\/ plumb, 40\/60, slab &icirc;n stibiu, gam\u0103 de topire 183-235 &deg;C.<\/li>\n<\/ol>\n<p><em>Pentru (2) este necesar un ciocan de lipire cu o temperatur\u0103 mai mare cu 19&deg;C fa\u021b\u0103 de (1) pentru a ob\u0163ine acelea\u0219i rezultate.<\/em><\/p>\n<h3>Cositorirea NedZink&reg; NOVA<\/h3>\n<p>Cositorirea materialului NedZink&reg; NOVA produce,dac\u0103 se face corect, &icirc;mbin\u0103ri care sunt la fel de puternice ca materialul &icirc;n sine.<\/p>\n<p>Cositorirea materialului NedZink&reg; NOVA necesit\u0103 o aten\u0163ie special\u0103 \u015fi o metod\u0103 de lucru atent\u0103. &Icirc;n m\u0103sura evit\u0103rii daunelor este important s\u0103 nu se scurg\u0103 flux de sudur\u0103 \u015fi s\u0103 se cure\u0163e &icirc;mbin\u0103rile sudate. NedZink&reg; NOVA&nbsp;trebuie cositorit la o temperatur\u0103 pu\u0163in mai mare dec&acirc;t NedZink&reg; Natural.<\/p>\n<p>Sunt acceptate toate tipurile de solu\u021bii de flux dac\u0103 p\u0103r\u0163ile cu strat de patin\u0103 au fost deja cur\u0103\u0163ate mecanic. Acest lucru se poate face prin sablare.<\/p>\n<p>NedZink&reg; NOVA&nbsp;se livreaz\u0103 c&acirc;teodat\u0103 cu o folie de protec\u0163ie. Folia trebuie &icirc;ndep\u0103rtat\u0103 de pe suprafa\u0163a care trebuie cositorit\u0103.<\/p>\n<ol>\n<li>Se aplic\u0103 un strat de flux pe partea superioar\u0103 a tablei de dedesubt, &icirc;n zona ce urmeaz\u0103 a fi lipit\u0103. Se va asigura o suprapunere de 10 mm pentru o &icirc;mbinare puternic\u0103.<\/li>\n<li>Se aplica un strat de flux pe intradosul tablei de deasupra.<\/li>\n<li>Se aseaz\u0103 foaia de tabl\u0103 superioar\u0103 peste cea inferioar\u0103 \u015fi se aplic\u0103 un strat de flux pe tabla superioar\u0103, &icirc;n zona de cositorire. Se asigur\u0103 de asemenea acoperirea &icirc;mbin\u0103rii.<\/li>\n<li class=\"sub over\">Se lipesc materialele cu ajutorul unui ciocan de lipit fierbinte \u015fi cu aliaj de cositorit de concentra\u0163ie 50\/50 sau 40\/60. Se folose\u0219te un ciocan de lipit cu o greutate cuprins\u0103 &icirc;ntre 500g \u0219i 750g. Se &icirc;ndep\u0103rteaz\u0103 cu grij\u0103 orice urm\u0103 de sudur\u0103 cu un burete umed sau o carp\u0103 umed\u0103.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>Exist\u0103 o diferen\u0163\u0103 de &icirc;mbinare prin cositorire a zincului NedZink Natural, zincului &icirc;nvechit (patinat) \u015fi a zincului pre-patinat NOVA sau NOIR. Cositorirea zincului nou Cositorirea trebuie efectuat\u0103 de preferat &icirc;n atelier. Dac\u0103 acest lucru nu este posibil sau nu este viabil din punct de vedere economic, atunci cositorirea se face &icirc;n \u015fantier. Cositorirea trebuie efectuat\u0103 [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"parent":0,"menu_order":600,"comment_status":"closed","ping_status":"closed","template":"template-import.php","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-30660","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Cositorirea \u2013 NedZink<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.nedzink.com\/ro\/cositorirea\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cositorirea \u2013 NedZink\" \/>\n<meta property=\"og:description\" content=\"Exist\u0103 o diferen\u0163\u0103 de &icirc;mbinare prin cositorire a zincului NedZink Natural, zincului &icirc;nvechit (patinat) \u015fi a zincului pre-patinat NOVA sau NOIR. 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