{"id":269,"date":"2025-08-24T21:41:06","date_gmt":"2025-08-24T21:41:06","guid":{"rendered":"https:\/\/pwhtsolutions.net\/?p=269"},"modified":"2025-08-24T21:41:07","modified_gmt":"2025-08-24T21:41:07","slug":"proces-tepelneho-zpracovani-po-svarovani","status":"publish","type":"post","link":"http:\/\/pwhtsolutions.net\/cs\/the-post-weld-heat-treatment-process\/","title":{"rendered":"Proces tepeln\u00e9ho zpracov\u00e1n\u00ed po sva\u0159ov\u00e1n\u00ed"},"content":{"rendered":"

Sva\u0159ov\u00e1n\u00ed je \u00fa\u010dinn\u00e1 metoda v\u00fdroby pevn\u00fdch kovov\u00fdch konstrukc\u00ed. Jeho extr\u00e9mn\u00ed teploty v\u0161ak mohou v kovech vyvolat i vnit\u0159n\u00ed nap\u011bt\u00ed a mikrostruktur\u00e1ln\u00ed zm\u011bny, kter\u00e9 vedou k potenci\u00e1ln\u00edm skryt\u00fdm vnit\u0159n\u00edm nap\u011bt\u00edm nebo zm\u011bn\u00e1m mikrostruktury.<\/p>\n

PWHT (tepeln\u00e9 zpracov\u00e1n\u00ed po sva\u0159ov\u00e1n\u00ed) m\u016f\u017ee tyto \u00fa\u010dinky zm\u00edrnit, \u010d\u00edm\u017e se zlep\u0161\u00ed v\u00fdkon a prodlou\u017e\u00ed \u017eivotnost sou\u010d\u00e1sti. Proces PWHT spole\u010dnosti Team, kter\u00fd zahrnuje postupy od tepeln\u00e9ho rozta\u017een\u00ed a\u017e po \u017e\u00edh\u00e1n\u00ed v roztoku, sni\u017euje vnit\u0159n\u00ed pnut\u00ed a z\u00e1rove\u0148 zlep\u0161uje struktur\u00e1ln\u00ed integritu tak, aby byly spln\u011bny pr\u016fmyslov\u00e9 normy.<\/p>\n

\u017d\u00edh\u00e1n\u00ed<\/h2>\n

Jeliko\u017e sva\u0159ov\u00e1n\u00ed zahrnuje rychl\u00e9 zah\u0159\u00edv\u00e1n\u00ed a ochlazov\u00e1n\u00ed materi\u00e1l\u016f, mohou vzniknout vysok\u00e9 teplotn\u00ed gradienty, kter\u00e9 vedou ke deformaci nebo oslaben\u00ed konstrukc\u00ed. Tepeln\u00e9 zpracov\u00e1n\u00ed po sva\u0159ov\u00e1n\u00ed pom\u00e1h\u00e1 tyto \u00fa\u010dinky zm\u00edrnit t\u00edm, \u017ee sni\u017euje zbytkov\u00e9 nap\u011bt\u00ed a zlep\u0161uje mechanick\u00e9 vlastnosti sva\u0159ovan\u00fdch sou\u010d\u00e1st\u00ed.<\/p>\n

PWHT (Precision Welded Heat Treating) je proces, p\u0159i kter\u00e9m se \u010d\u00e1sti sva\u0159ovan\u00fdch konstrukc\u00ed po del\u0161\u00ed dobu zah\u0159\u00edvaj\u00ed na zv\u00fd\u0161en\u00e9 teploty a n\u00e1sledn\u011b se v t\u00e9to teplot\u011b udr\u017euj\u00ed, aby do\u0161lo k rozta\u017een\u00ed a p\u0159erozd\u011blen\u00ed materi\u00e1lu, \u010d\u00edm\u017e se odstran\u00ed ne\u017e\u00e1douc\u00ed nap\u011bt\u00ed, kter\u00e1 by jinak mohla v\u00e9st ke k\u0159ehkosti, prask\u00e1n\u00ed nebo jin\u00fdm typ\u016fm poru\u0161en\u00ed p\u0159i dynamick\u00e9m zat\u00ed\u017een\u00ed.<\/p>\n

R\u016fzn\u00e9 kovy vy\u017eaduj\u00ed pro dosa\u017een\u00ed optim\u00e1ln\u00edch v\u00fdsledk\u016f specifick\u00e1 tepeln\u00e1 zpracov\u00e1n\u00ed po sva\u0159ov\u00e1n\u00ed, a proto je v\u00fdb\u011br spr\u00e1vn\u00e9 metody z\u00e1sadn\u00ed. Potrub\u00ed obvykle vy\u017eaduje speci\u00e1ln\u00ed techniky, jako je normalizace a odstra\u0148ov\u00e1n\u00ed nap\u011bt\u00ed, aby se minimalizovalo prask\u00e1n\u00ed zp\u016fsoben\u00e9 vod\u00edkem, k n\u011bmu\u017e doch\u00e1z\u00ed pod zem\u00ed nebo na mo\u0159i, a zajistila se tak bezpe\u010dnost a spolehlivost v podzemn\u00edch i mo\u0159sk\u00fdch podm\u00ednk\u00e1ch. T\u011b\u017ek\u00e1 technika mus\u00ed \u010dasto odol\u00e1vat intenzivn\u00edmu nam\u00e1h\u00e1n\u00ed; pro lep\u0161\u00ed odolnost proti \u00fanav\u011b materi\u00e1lu a opot\u0159eben\u00ed mohou metody jako popou\u0161t\u011bn\u00ed zv\u00fd\u0161it hou\u017eevnatost a ta\u017enost sva\u0159ovan\u00fdch sou\u010d\u00e1st\u00ed, aby l\u00e9pe odol\u00e1valy \u00fanav\u011b a opot\u0159eben\u00ed.<\/p>\n

Normalizace<\/h2>\n

Normaliza\u010dn\u00ed tepeln\u00e9 zpracov\u00e1n\u00ed (NHT) sni\u017euje tvrdost a z\u00e1rove\u0148 zvy\u0161uje ta\u017enost a hou\u017eevnatost; nav\u00edc sjednocuje mikrostrukturu a zjem\u0148uje zrno, co\u017e usnad\u0148uje n\u00e1sledn\u00e9 obr\u00e1b\u011bn\u00ed a tv\u00e1\u0159en\u00ed a zabra\u0148uje vzniku trhlin zp\u016fsoben\u00fdch vod\u00edkem (HIC).<\/p>\n

Po sva\u0159ov\u00e1n\u00ed m\u016f\u017ee u kov\u016f, jako je uhl\u00edkov\u00e1 a legovan\u00e1 ocel, doj\u00edt k rychl\u00e9mu ochlazen\u00ed, kter\u00e9 m\u011bn\u00ed jejich mikrostrukturu, co\u017e vede ke koncentrac\u00edm nap\u011bt\u00ed, deformac\u00edm nebo prask\u00e1n\u00ed \u2013 proto je tepeln\u00e9 zpracov\u00e1n\u00ed po sva\u0159ov\u00e1n\u00ed (PWHT) tak nezbytn\u00e9 u velk\u00fdch konstrukc\u00ed nebo potrub\u00ed vystaven\u00fdch opakovan\u00fdm zat\u011b\u017eovac\u00edm cykl\u016fm.<\/p>\n

Normalizace spo\u010d\u00edv\u00e1 v pe\u010dliv\u00e9m zah\u0159\u00e1t\u00ed sva\u0159ovan\u00e9ho kovu na teplotu mezi teplotou rekrystalizace a teplotou t\u00e1n\u00ed, p\u0159i\u010dem\u017e se p\u016fvodn\u00ed austenitov\u00e1 zrna nahrazuj\u00ed jemn\u011bj\u0161\u00ed bainitovou strukturou s rozpt\u00fdlen\u00fdmi feritov\u00fdmi zrny, rozpt\u00fdlen\u00fdmi cementitov\u00fdmi vm\u011bstky na hranic\u00edch zrn a atomovou migrac\u00ed ke sn\u00ed\u017een\u00ed anizotropie mikrostruktury, \u010d\u00edm\u017e se dos\u00e1hne rovnom\u011brn\u011bj\u0161\u00edho rozlo\u017een\u00ed slo\u017eek slitiny a t\u00edm i \u017e\u00e1douc\u00edch v\u00fdsledk\u016f normalizace.<\/p>\n

Odstra\u0148ov\u00e1n\u00ed stresu<\/h2>\n

Odstran\u011bn\u00ed vnit\u0159n\u00edho pnut\u00ed je osv\u011bd\u010denou technikou pro uvoln\u011bn\u00ed vnit\u0159n\u00edho zbytkov\u00e9ho pnut\u00ed zp\u016fsoben\u00e9ho sva\u0159ov\u00e1n\u00edm. Metoda PWHT spo\u010d\u00edv\u00e1 v oh\u0159\u00e1t\u00ed materi\u00e1lu na vysokou teplotu a jeho n\u00e1sledn\u00e9m pomal\u00e9m ochlazov\u00e1n\u00ed, co\u017e umo\u017e\u0148uje jeho rovnom\u011brn\u00e9 roztahov\u00e1n\u00ed a smr\u0161\u0165ov\u00e1n\u00ed a t\u00edm uvoln\u011bn\u00ed nap\u011bt\u00ed v jeho struktu\u0159e. To je obzvl\u00e1\u0161t\u011b d\u016fle\u017eit\u00e9 p\u0159i pr\u00e1ci s d\u00edly, kter\u00e9 maj\u00ed b\u00fdt d\u00e1le zpracov\u00e1v\u00e1ny, nap\u0159\u00edklad fr\u00e9zov\u00e1n\u00edm na CNC stroj\u00edch.<\/p>\n

\u017d\u00edh\u00e1n\u00ed pro odstran\u011bn\u00ed zbytkov\u00e9ho nap\u011bt\u00ed v\u00fdrazn\u011b sni\u017euje zbytkov\u00e9 tahov\u00e9 nap\u011bt\u00ed, av\u0161ak ne na nulu; proto by se tyto procesy m\u011bly v\u017edy prov\u00e1d\u011bt p\u0159ed jak\u00fdmkoli obr\u00e1b\u011bn\u00edm, aby se zabr\u00e1nilo rozm\u011brov\u00fdm zm\u011bn\u00e1m a poruch\u00e1m. Zabra\u0148uje tak\u00e9 difuzi zachycen\u00e9ho vod\u00edku do svar\u016f, co\u017e by jinak mohlo v\u00e9st ke k\u0159ehnut\u00ed a trhlin\u00e1m zp\u016fsoben\u00fdm vod\u00edkem, co\u017e \u010din\u00ed tuto metodu obzvl\u00e1\u0161t\u011b d\u016fle\u017eitou v p\u0159\u00edpad\u011b vystaven\u00ed podzemn\u00edmu nebo podvodn\u00edmu prost\u0159ed\u00ed \u010di u t\u011b\u017ek\u00e9 techniky, kter\u00e1 mus\u00ed odol\u00e1vat \u00fanav\u011b materi\u00e1lu a dal\u0161\u00edm faktor\u016fm; \u010dasto se p\u0159i t\u00e9to metod\u011b vyu\u017e\u00edv\u00e1 induk\u010dn\u00ed oh\u0159ev, kter\u00fd tento proces zna\u010dn\u011b urychluje.<\/p>\n

Temperov\u00e1n\u00ed<\/h2>\n

PWHT m\u016f\u017ee zm\u00edrnit zbytkov\u00e1 nap\u011bt\u00ed zp\u016fsoben\u00e1 sva\u0159ov\u00e1n\u00edm, kter\u00e1 p\u0159isp\u00edvaj\u00ed k prask\u00e1n\u00ed vyvolan\u00e9mu vod\u00edkem a k korozn\u00edmu nam\u00e1h\u00e1n\u00ed, \u010d\u00edm\u017e sni\u017euje riziko poruchy a zvy\u0161uje v\u00fdkonnost.<\/p>\n

Temperov\u00e1n\u00ed je proces, p\u0159i kter\u00e9m se sva\u0159ovan\u00fd materi\u00e1l zah\u0159eje na p\u0159esnou teplotu a pot\u00e9 se pomalu ochlad\u00ed, \u010d\u00edm\u017e se uvoln\u00ed vnit\u0159n\u00ed pnut\u00ed a z\u00e1rove\u0148 se sn\u00ed\u017e\u00ed nebo zcela odstran\u00ed zbytkov\u00e9 pnut\u00ed v oblasti svaru, ani\u017e by do\u0161lo ke sn\u00ed\u017een\u00ed pevnosti.<\/p>\n

Lok\u00e1ln\u00ed tepeln\u00e9 zpracov\u00e1n\u00ed po sva\u0159ov\u00e1n\u00ed lze prov\u00e1d\u011bt pomoc\u00ed r\u016fzn\u00fdch technik, jako jsou kysl\u00edko-plynov\u00e9 plameny, odporov\u00e9 topn\u00e9 prvky nebo oh\u0159ev v peci. Pro zaji\u0161t\u011bn\u00ed rovnom\u011brn\u00e9ho oh\u0159evu v cel\u00e9m d\u00edlu je rovnom\u011brnost z\u00e1sadn\u00ed \u2013 nerovnom\u011brn\u00fd oh\u0159ev m\u016f\u017ee v\u00e9st k tepeln\u00fdm gradient\u016fm, kter\u00e9 by mohly zp\u016fsobit vznik dal\u0161\u00edch zbytkov\u00fdch nap\u011bt\u00ed nebo deformac\u00ed.<\/p>\n

Spr\u00e1vn\u00e9 tepeln\u00e9 zpracov\u00e1n\u00ed po sva\u0159ov\u00e1n\u00ed je kl\u00ed\u010dov\u00e9 pro zaji\u0161t\u011bn\u00ed dlouhodob\u00e9 pevnosti a spolehlivosti. Je-li prov\u00e1d\u011bno spr\u00e1vn\u011b, m\u016f\u017ee tepeln\u00e9 zpracov\u00e1n\u00ed po sva\u0159ov\u00e1n\u00ed zlep\u0161it pevnost v tahu, te\u010den\u00ed a hou\u017eevnatost v z\u00e1\u0159ezu a tak\u00e9 zabr\u00e1nit k\u0159ehk\u00e9mu lomu a vod\u00edkov\u00e9 k\u0159ehkosti; je-li v\u0161ak prov\u00e1d\u011bno nespr\u00e1vn\u011b, m\u016f\u017ee v\u00e9st k poruch\u00e1m svar\u016f, sn\u00ed\u017een\u00ed \u00fanosnosti a tak\u00e9 ke sn\u00ed\u017een\u00ed ta\u017enosti a odolnosti proti korozi.<\/p>","protected":false},"excerpt":{"rendered":"

Sva\u0159ov\u00e1n\u00ed je \u00fa\u010dinnou metodou vytv\u00e1\u0159en\u00ed pevn\u00fdch kovov\u00fdch konstrukc\u00ed. Extr\u00e9mn\u00ed teploty v\u0161ak mohou v kovech vyvolat vnit\u0159n\u00ed pnut\u00ed a mikrostrukturn\u00ed zm\u011bny, kter\u00e9 mohou v\u00e9st ke skryt\u00fdm vnit\u0159n\u00edm pnut\u00edm nebo mikrostrukturn\u00edm zm\u011bn\u00e1m. PWHT (tepeln\u00e9 zpracov\u00e1n\u00ed po sva\u0159ov\u00e1n\u00ed) m\u016f\u017ee tyto \u00fa\u010dinky zm\u00edrnit a zlep\u0161it tak v\u00fdkonnost a prodlou\u017eit \u017eivotnost sou\u010d\u00e1st\u00ed. Od expanzn\u00edho oh\u0159evu a\u017e po ... <\/p>\n

P\u0159e\u010dt\u011bte si v\u00edce \u201cProces tepeln\u00e9ho zpracov\u00e1n\u00ed po sva\u0159ov\u00e1n\u00ed\u201d<\/span><\/a><\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-269","post","type-post","status-publish","format-standard","hentry","category-pwht-knowledge"],"aioseo_notices":[],"_links":{"self":[{"href":"http:\/\/pwhtsolutions.net\/cs\/wp-json\/wp\/v2\/posts\/269","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/pwhtsolutions.net\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/pwhtsolutions.net\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/pwhtsolutions.net\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/pwhtsolutions.net\/cs\/wp-json\/wp\/v2\/comments?post=269"}],"version-history":[{"count":1,"href":"http:\/\/pwhtsolutions.net\/cs\/wp-json\/wp\/v2\/posts\/269\/revisions"}],"predecessor-version":[{"id":270,"href":"http:\/\/pwhtsolutions.net\/cs\/wp-json\/wp\/v2\/posts\/269\/revisions\/270"}],"wp:attachment":[{"href":"http:\/\/pwhtsolutions.net\/cs\/wp-json\/wp\/v2\/media?parent=269"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/pwhtsolutions.net\/cs\/wp-json\/wp\/v2\/categories?post=269"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/pwhtsolutions.net\/cs\/wp-json\/wp\/v2\/tags?post=269"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}