{"id":3518,"date":"2025-07-02T08:35:00","date_gmt":"2025-07-02T00:35:00","guid":{"rendered":"https:\/\/www.topfastpcb.com\/?p=3518"},"modified":"2025-06-30T15:10:08","modified_gmt":"2025-06-30T07:10:08","slug":"welding-flaw-detection","status":"publish","type":"post","link":"https:\/\/www.topfastpcb.com\/fi\/blog\/welding-flaw-detection\/","title":{"rendered":"PCB-hitsausvirheiden havaitseminen"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_74 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Sis\u00e4llysluettelo<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/welding-flaw-detection\/#Welding_flaw_detection_methods\" >Hitsausvirheiden havaitsemismenetelm\u00e4t<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/welding-flaw-detection\/#1_Radiographic_Testing_RT\" >1. R\u00f6ntgentutkimus (RT)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/welding-flaw-detection\/#2_Ultrasonic_Testing_UT\" >2.Ultra\u00e4\u00e4nitarkastus (UT)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/welding-flaw-detection\/#3_Magnetic_Particle_Testing_MT\" >3.Magneettihiukkasten testaus (MT)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/welding-flaw-detection\/#4_Penetrant_Testing_PT\" >4.Tunkeumakoe (PT)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/welding-flaw-detection\/#5_Eddy_Current_Testing_ET\" >5.Py\u00f6rrevirtatestaus (ET)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/welding-flaw-detection\/#Five-Method_Comparison_Chart\" >Viiden menetelm\u00e4n vertailutaulukko<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/welding-flaw-detection\/#Frequently_Asked_Solutions\" >Usein kysytyt ratkaisut<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Welding_flaw_detection_methods\"><\/span>Hitsausvirheiden havaitsemismenetelm\u00e4t<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Hitsaus on nykyaikaisen teollisuuden v\u00e4ltt\u00e4m\u00e4t\u00f6n liitosprosessi, joka vaikuttaa suoraan teknisten rakenteiden turvallisuuteen ja k\u00e4ytt\u00f6ik\u00e4\u00e4n. Topfastin big data -analyysin mukaan yli 60 prosenttia rakenteiden vikaantumisonnettomuuksista johtuu hitsausvirheist\u00e4, joten hitsausvirheiden havaitseminen on keskeinen osa laadunvalvontaa.<\/p><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"402\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/06\/Welding-flaw-detection-3.jpg\" alt=\"Hitsausvirheiden havaitseminen\" class=\"wp-image-3519\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/06\/Welding-flaw-detection-3.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/06\/Welding-flaw-detection-3-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/06\/Welding-flaw-detection-3-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Radiographic_Testing_RT\"><\/span>1. R\u00f6ntgentutkimus (RT)<span class=\"ez-toc-section-end\"><\/span><\/h3><p>RT on edelleen klassinen sis\u00e4isten vikojen havaitsemismenetelm\u00e4, joka tarkoittaa l\u00e4hinn\u00e4 r\u00f6ntgenkuvien ottamista hitsisaumoista.Se paljastaa sis\u00e4iset viat, kuten huokoisuus, kuonan sulkeumat ja sulamisen puute, differentiaalisen s\u00e4teilyabsorptiokuvantamisen avulla.<\/p><p><strong>T\u00e4rkeimm\u00e4t ominaisuudet:<\/strong><\/p><ul class=\"wp-block-list\"><li>Herkkyys saavuttaa 1%-2% sein\u00e4m\u00e4n paksuus (GB \/ T 3323-2019 standardi)<\/li>\n\n<li>Yli 95 prosentin havaitsemisprosentti tilavuusvikojen osalta.<\/li>\n\n<li>Soveltuu hiili- ja seostetun ter\u00e4ksen hitsausliitoksille, joiden paksuus on \u2264300 mm.<\/li>\n\n<li>Korkeammat kustannukset (noin 100-200 dollaria tarkastusta kohti).<\/li><\/ul><p><strong>Sovellukset:<\/strong> Paineastiat, putkistojen keh\u00e4hitsit, kattilat ja muut kriittiset paineita sis\u00e4lt\u00e4v\u00e4t komponentit.<\/p><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Lis\u00e4tietoja rekister\u00f6intistandardeista? <a href=\"https:\/\/www.chinesestandard.net\/PDF.aspx\/GBT3323.1-2019\">Katso GB\/T 3323-2019 yksityiskohtainen tulkinta<\/a><\/p><\/blockquote><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Ultrasonic_Testing_UT\"><\/span>2.Ultra\u00e4\u00e4nitarkastus (UT)<span class=\"ez-toc-section-end\"><\/span><\/h3><p>UT hy\u00f6dynt\u00e4\u00e4 sis\u00e4isten vikojen korkeataajuisia \u00e4\u00e4niaaltoheijastuksia, mik\u00e4 mahdollistaa sukellusveneluotainten kaltaisen tarkkuuden vikojen paikantamisessa.<\/p><p><strong>Tekniset kohokohdat:<\/strong><\/p><ul class=\"wp-block-list\"><li>1-10MHz anturin taajuusalue (ISO 17636-1:2022)<\/li>\n\n<li>Jopa 90 % halkeamien havaitsemisaste<\/li>\n\n<li>Ihanteellinen metallihitseille, joiden paksuus on \u22656mm.<\/li>\n\n<li>Vaatii korkeasti koulutettuja k\u00e4ytt\u00e4ji\u00e4 (ASNT\/EN 473 Level III -sertifiointi).<\/li><\/ul><p><strong>Tapaustutkimus:<\/strong> Taajuuden nostaminen 5 MHz:st\u00e4 10 MHz:iin parantaa halkeamien havaitsemista 22 % 8 mm:n alumiinihitseiss\u00e4.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Magnetic_Particle_Testing_MT\"><\/span>3.Magneettihiukkasten testaus (MT)<span class=\"ez-toc-section-end\"><\/span><\/h3><p>MT on erikoistunut ferromagneettisiin materiaaleihin, ja se paljastaa nopeasti pinta-\/alipintaviat magneettivuon vuotoindikaatioiden avulla.<\/p><p><strong>T\u00e4rkeimm\u00e4t edut:<\/strong><\/p><ul class=\"wp-block-list\"><li>0,1 mm s\u00e4r\u00f6n havaitsemisherkkyys (ASTM E1444-2022)<\/li>\n\n<li>Nopein menetelm\u00e4 (\u22485 minuuttia\/hitsi)<\/li>\n\n<li>Rajoitettu ferromagneettisiin materiaaleihin<\/li>\n\n<li>Vaatii korkean l\u00e4mp\u00f6tilan jauhetta &gt;300 \u00b0C:n sovelluksiin (450 \u00b0C:n raja).<\/li><\/ul><p><strong>Teollisuuden k\u00e4ytt\u00f6tarkoitukset:<\/strong> Ter\u00e4ssiltojen, varastos\u00e4ili\u00f6iden, laivanrakennuksen ja muiden ferromagneettisten materiaalien tarkastukset.<\/p><p><a href=\"https:\/\/www.topfastpcb.com\/fi\/contact\/\">Ammattimaiset hitsaustarkastuspalvelut<\/a><\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Penetrant_Testing_PT\"><\/span>4.Tunkeumakoe (PT)<span class=\"ez-toc-section-end\"><\/span><\/h3><p>PT k\u00e4ytt\u00e4\u00e4 kapillaarivaikutusta ime\u00e4kseen tunkeutumisainetta pintaa rikkoviin vikoihin ja paljastaakseen jopa mikrometriluokan halkeamat.<\/p><p><strong>Kriittiset parametrit:<\/strong><\/p><ul class=\"wp-block-list\"><li>Havaitsee halkeamat, joiden leveys on \u22650,5\u03bcm.<\/li>\n\n<li>V\u00e4hint\u00e4\u00e4n 10 minuutin viipym\u00e4aika (ISO 3452-2022).<\/li>\n\n<li>Soveltuu ei-huokoisille materiaaleille<\/li>\n\n<li>Ei pysty havaitsemaan maanalaisia vikoja<\/li><\/ul><p><strong>Tyypilliset sovellukset:<\/strong> Ruostumattomasta ter\u00e4ksest\u00e4 valmistetut putket, alumiiniset komponentit ja muut ei-huokoiset materiaalipinnat.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_Eddy_Current_Testing_ET\"><\/span>5.Py\u00f6rrevirtatestaus (ET)<span class=\"ez-toc-section-end\"><\/span><\/h3><p>ET k\u00e4ytt\u00e4\u00e4 s\u00e4hk\u00f6magneettista induktiota nopeaan pintavikojen seulontaan, joka on erityisen tehokas massatuotannon laadunvarmistuksessa.<\/p><p><strong>Tekniset tiedot:<\/strong><\/p><ul class=\"wp-block-list\"><li>100Hz-1MHz taajuusalue (ASTM E309-2022)<\/li>\n\n<li>Tarkastusnopeus jopa 10 m\/min<\/li>\n\n<li>\u00b115% syvyyden mittausvirhe<\/li>\n\n<li>Vain johtimet<\/li><\/ul><p><strong>Ensisijaiset k\u00e4ytt\u00f6tarkoitukset:<\/strong> Putki-\/levyhitsaukset, erityisesti ilmailu- ja avaruusteollisuuden ohutsein\u00e4iset komponentit.<\/p><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"402\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/06\/Welding-flaw-detection-2.jpg\" alt=\"Hitsausvirheiden havaitseminen\" class=\"wp-image-3521\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/06\/Welding-flaw-detection-2.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/06\/Welding-flaw-detection-2-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/06\/Welding-flaw-detection-2-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Five-Method_Comparison_Chart\"><\/span>Viiden menetelm\u00e4n vertailutaulukko<span class=\"ez-toc-section-end\"><\/span><\/h2><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Menetelm\u00e4<\/th><th>Syvyys<\/th><th>Materiaalit<\/th><th>Vauriotyypit<\/th><th>Nopeus<\/th><th>Kustannukset<\/th><\/tr><\/thead><tbody><tr><td>RT<\/td><td>T\u00e4ysi<\/td><td>Metallit<\/td><td>Volumetrinen<\/td><td>Hidas<\/td><td>Korkea<\/td><\/tr><tr><td>UT<\/td><td>T\u00e4ysi<\/td><td>Metallit<\/td><td>Planar<\/td><td>Medium<\/td><td>Medium<\/td><\/tr><tr><td>MT<\/td><td>Pinta<\/td><td>Ferromagneettinen<\/td><td>Halkeamat<\/td><td>Nopea<\/td><td>Matala<\/td><\/tr><tr><td>PT<\/td><td>Pinta<\/td><td>Huokoseton<\/td><td>Avoimet ty\u00f6paikat<\/td><td>Medium<\/td><td>Matala<\/td><\/tr><tr><td>ET<\/td><td>Pinta<\/td><td>Johtava<\/td><td>Pinta<\/td><td>Eritt\u00e4in nopea<\/td><td>Medium<\/td><\/tr><\/tbody><\/table><\/figure><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Frequently_Asked_Solutions\"><\/span>Usein kysytyt ratkaisut<span class=\"ez-toc-section-end\"><\/span><\/h2><p><strong>K: Miten yhdist\u00e4\u00e4 useita menetelmi\u00e4?<\/strong><br>V: TSG 21-2016:n mukaan paines\u00e4ili\u00f6iden keh\u00e4hitsauksissa suositellaan RT+MT-yhdistelm\u00e4\u00e4, joka lis\u00e4\u00e4 kustannuksia 40 % mutta v\u00e4hent\u00e4\u00e4 virheprosentin alle 0,5 %:iin.<\/p><p><strong>K: Tarkastusriitojen ratkaiseminen?<\/strong><br>V: ASME V artikla 4 edellytt\u00e4\u00e4 6dB-menetelm\u00e4n uusintatestausta, kun UT-indikaatiot j\u00e4\u00e4v\u00e4t 50-80% DAC-k\u00e4yr\u00e4n v\u00e4liin, jolloin sovitteluvirhe on \u00b11mm.<\/p><p><strong>K: Korkean l\u00e4mp\u00f6tilan tarkastukset?<\/strong><br>V: Korkean l\u00e4mp\u00f6tilan fluoresoiva magneettipulveri s\u00e4ilytt\u00e4\u00e4 300 \u00b0C:n ty\u00f6kappaleissa 98 %:n havaitsemisvarmuuden.<\/p><p>Hitsauksen tarkastusmenetelmien valinta edellytt\u00e4\u00e4 materiaalin ominaisuuksien, vikatyyppien, standardien ja budjetin kattavaa tarkastelua. Asianmukainen soveltaminen varmistaa hitsauksen laadun ja projektin turvallisuuden. <a href=\"https:\/\/www.topfastpcb.com\/fi\/contact\/\">Ota yhteytt\u00e4 asiantuntijatiimiimme<\/a> ammattimaisiin tarkastuspalveluihin.<\/p><p><\/p>","protected":false},"excerpt":{"rendered":"<p>Hitsaus on nykyaikaisen teollisuuden v\u00e4ltt\u00e4m\u00e4t\u00f6n liitosprosessi, joka vaikuttaa suoraan teknisten rakenteiden turvallisuuteen ja k\u00e4ytt\u00f6ik\u00e4\u00e4n. Tilastojen mukaan yli 60 prosenttia rakenteiden vikaantumisonnettomuuksista johtuu hitsausvirheist\u00e4, joten hitsausvirheiden havaitseminen on keskeinen osa laadunvalvontaa.<\/p>","protected":false},"author":1,"featured_media":3520,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[112],"tags":[314],"class_list":["post-3518","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowledge","tag-welding-detection"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>PCB Welding flaw detection - Topfastpcb<\/title>\n<meta name=\"description\" content=\"Welding inspection is a critical step in ensuring welding quality. 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