{"id":5054,"date":"2026-01-31T08:14:00","date_gmt":"2026-01-31T00:14:00","guid":{"rendered":"https:\/\/www.topfastpcb.com\/?p=5054"},"modified":"2026-01-21T15:56:43","modified_gmt":"2026-01-21T07:56:43","slug":"cracked-vias-and-barrel-cracks-in-pcb","status":"publish","type":"post","link":"https:\/\/www.topfastpcb.com\/da\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/","title":{"rendered":"Revnede vias og t\u00f8ndespr\u00e6kker i PCB"},"content":{"rendered":"<p>Revnede vias og t\u00f8nderevner er blandt de mest kritiske. <strong>latente fejl i p\u00e5lideligheden<\/strong> i PCB-produktion.<\/p><p>Disse defekter best\u00e5r ofte den f\u00f8rste elektriske test, men fejler senere under termisk eller mekanisk stress, hvilket g\u00f8r dem s\u00e6rligt farlige i applikationer med h\u00f8j p\u00e5lidelighed.<\/p><p>Det forklarer denne artikel:<\/p><ul class=\"wp-block-list\"><li>Hvad er via-revner og t\u00f8nde-revner?<\/li>\n\n<li>Hvorfor de opst\u00e5r<\/li>\n\n<li>Hvordan de opdages<\/li>\n\n<li>Hvordan producenter reducerer deres forekomst<\/li><\/ul><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"337\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures.jpg\" alt=\"PCB-fejl\" class=\"wp-image-5055\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures-300x169.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures-18x10.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><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\">Indholdsfortegnelse<\/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\/da\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#What_Are_Via_Cracks_and_Barrel_Cracks\" >Hvad er Via Cracks og Barrel Cracks?<\/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\/da\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Via_Crack\" >Via Crack<\/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\/da\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Barrel_Crack\" >T\u00f8ndekn\u00e6k<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Why_Via_Cracks_Are_a_Serious_Reliability_Issue\" >Hvorfor Via-revner er et alvorligt problem for p\u00e5lideligheden<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Primary_Causes_of_Via_and_Barrel_Cracks\" >Prim\u00e6re \u00e5rsager til Via- og t\u00f8nderevner<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Z-Axis_Expansion_Mismatch\" >Uoverensstemmelse i Z-aksens udvidelse<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Thin_or_Non-Uniform_Copper_Plating\" >Tynd eller uensartet kobberbel\u00e6gning<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#High_Aspect_Ratio_Vias\" >Vias med h\u00f8jt aspektforhold<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Excessive_Thermal_Cycling\" >Overdreven termisk cykling<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Design_Factors_That_Increase_Via_Crack_Risk\" >Designfaktorer, der \u00f8ger risikoen for Via Crack<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#High-Risk_Design_Choices\" >Designvalg med h\u00f8j risiko<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Manufacturing_Factors_Contributing_to_Via_Cracks\" >Produktionsfaktorer, der bidrager til Via-revner<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Drilling_Quality\" >Boringens kvalitet<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Inadequate_Desmear_Process\" >Utilstr\u00e6kkelig afsmitningsproces<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Plating_Stress_Control\" >Kontrol af pladesp\u00e6nding<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#How_Via_Cracks_Are_Detected\" >Hvordan Via-revner opdages<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Common_Detection_Methods\" >Almindelige detektionsmetoder<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Preventing_Cracked_Vias_and_Barrel_Cracks\" >Forebyggelse af revnede vias og t\u00f8ndespr\u00e6kker<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Design-Level_Prevention\" >Forebyggelse p\u00e5 designniveau<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Process-Level_Prevention\" >Forebyggelse p\u00e5 procesniveau<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Material_Selection\" >Valg af materiale<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Relationship_to_Other_PCB_Failure_Modes\" >Forholdet til andre PCB-fejlmodi<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Conclusion\" >Konklusion<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Via_Cracks_in_PCB_FAQ\" >Via revner i PCB FAQ<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Are_Via_Cracks_and_Barrel_Cracks\"><\/span>Hvad er Via Cracks og Barrel Cracks?<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Via_Crack\"><\/span>Via Crack<span class=\"ez-toc-section-end\"><\/span><\/h3><p>En via-revne er et brud i kobberbel\u00e6gningen p\u00e5 en via, typisk ved:<\/p><ul class=\"wp-block-list\"><li>Kn\u00e6et p\u00e5 via'en<\/li>\n\n<li>Gr\u00e6nsefladen mellem kobber og dielektrikum<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Barrel_Crack\"><\/span>T\u00f8ndekn\u00e6k<span class=\"ez-toc-section-end\"><\/span><\/h3><p>En t\u00f8nderevne refererer specifikt til en <strong>Omfattende revne<\/strong> i den belagte via-t\u00f8nde.<\/p><p>Begge afbryder den elektriske kontinuitet over tid.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_Via_Cracks_Are_a_Serious_Reliability_Issue\"><\/span>Hvorfor Via-revner er et alvorligt problem for p\u00e5lideligheden<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Via-revner er farlige, fordi de:<\/p><ul class=\"wp-block-list\"><li>Er ofte intermitterende<\/li>\n\n<li>Forv\u00e6rres med termisk cykling<\/li>\n\n<li>Er sv\u00e6re at opdage visuelt<\/li><\/ul><p>De dukker ofte f\u00f8rst op efter brug i felten eller stresstest.<\/p><p><em>Oversigt over fejl:<\/em><br><strong><a href=\"https:\/\/www.topfastpcb.com\/da\/blog\/common-pcb-failures-causes-solutions\/\">Almindelige PCB-fejl forklaret<\/a><\/strong><\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Primary_Causes_of_Via_and_Barrel_Cracks\"><\/span>Prim\u00e6re \u00e5rsager til Via- og t\u00f8nderevner<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Z-Axis_Expansion_Mismatch\"><\/span>Uoverensstemmelse i Z-aksens udvidelse<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Under opvarmning udvider dielektriske materialer sig mere end kobber i Z-aksen.<\/p><p>Gentagen udvidelse og sammentr\u00e6kning skaber stress i via-t\u00f8nden.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Thin_or_Non-Uniform_Copper_Plating\"><\/span>Tynd eller uensartet kobberbel\u00e6gning<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Utilstr\u00e6kkelig pladetykkelse reducerer via'ens evne til at absorbere mekanisk stress.<\/p><p> <em>Procesdetaljer:<\/em><br><strong><a href=\"https:\/\/www.topfastpcb.com\/da\/blog\/copper-plating-process-in-pcb-manufacturing-explained\/\">Kobberbel\u00e6gningsproces i PCB-produktion<\/a><\/strong><\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"High_Aspect_Ratio_Vias\"><\/span>Vias med h\u00f8jt aspektforhold<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Vias med h\u00f8jt aspektforhold er mere udfordrende at placere ensartet og oplever st\u00f8rre stress.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Excessive_Thermal_Cycling\"><\/span>Overdreven termisk cykling<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Gentagen eksponering for:<\/p><ul class=\"wp-block-list\"><li>Reflow-lodning<\/li>\n\n<li>Power cykling<\/li>\n\n<li>\u00c6ndringer i omgivelsernes temperatur<\/li><\/ul><p>Fremskynder dannelsen af revner.<\/p><p><em>Test af p\u00e5lidelighed:<\/em><br><strong><a href=\"https:\/\/www.topfastpcb.com\/da\/blog\/pcb-reliability-testing-standards\/\">Test af PCB's termiske p\u00e5lidelighed<\/a><\/strong><\/p><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"337\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures-1.jpg\" alt=\"PCB-fejl\" class=\"wp-image-5056\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures-1.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures-1-300x169.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures-1-18x10.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Design_Factors_That_Increase_Via_Crack_Risk\"><\/span>Designfaktorer, der \u00f8ger risikoen for Via Crack<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Visse designbeslutninger \u00f8ger risikoen betydeligt.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"High-Risk_Design_Choices\"><\/span>Designvalg med h\u00f8j risiko<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Meget sm\u00e5 gennemgangsdiametre<\/li>\n\n<li>Tynd PCB-tykkelse med dybe vias<\/li>\n\n<li>Store kobberflader uden relief<\/li>\n\n<li>T\u00e6tte via-in-pad-strukturer<\/li><\/ul><p>Design-for-reliability-gennemgang er afg\u00f8rende.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Manufacturing_Factors_Contributing_to_Via_Cracks\"><\/span>Produktionsfaktorer, der bidrager til Via-revner<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Drilling_Quality\"><\/span>Boringens kvalitet<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Boresmuds, ru hulv\u00e6gge eller fiberudtr\u00e6k sv\u00e6kker kobberets vedh\u00e6ftning.<\/p><p><em>Sammenligning:<\/em><br><strong><a href=\"https:\/\/www.topfastpcb.com\/da\/blog\/pcb-drilling-vs-laser-drilling\/\">PCB-boring vs. laserboring<\/a><\/strong><\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Inadequate_Desmear_Process\"><\/span>Utilstr\u00e6kkelig afsmitningsproces<span class=\"ez-toc-section-end\"><\/span><\/h3><p>D\u00e5rlig afsmitning forhindrer korrekt kobberbinding til det dielektriske materiale.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Plating_Stress_Control\"><\/span>Kontrol af pladesp\u00e6nding<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Forkert pletteringskemi kan medf\u00f8re indre sp\u00e6ndinger i kobberaflejringer.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Via_Cracks_Are_Detected\"><\/span>Hvordan Via-revner opdages<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Via-revner opdages sj\u00e6ldent ved overfladeinspektion alene.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Common_Detection_Methods\"><\/span>Almindelige detektionsmetoder<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Test af termisk belastning<\/li>\n\n<li>Analyse af mikrosnit<\/li>\n\n<li>Elektrisk test efter cykling<\/li>\n\n<li>R\u00f8ntgeninspektion (begr\u00e6nset effektivitet)<\/li><\/ul><p><em>Oversigt over inspektioner:<\/em><br><strong><a href=\"https:\/\/www.topfastpcb.com\/da\/blog\/pcb-inspection-and-testing\/\">PCB-inspektion og -testning forklaret<\/a><\/strong><\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Preventing_Cracked_Vias_and_Barrel_Cracks\"><\/span>Forebyggelse af revnede vias og t\u00f8ndespr\u00e6kker<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Design-Level_Prevention\"><\/span>Forebyggelse p\u00e5 designniveau<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Tilstr\u00e6kkelig via-diameter<\/li>\n\n<li>Kontrolleret st\u00f8rrelsesforhold<\/li>\n\n<li>Termiske aflastningsm\u00f8nstre<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Process-Level_Prevention\"><\/span>Forebyggelse p\u00e5 procesniveau<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Optimerede boreparametre<\/li>\n\n<li>Ensartet tykkelse af kobberbel\u00e6gning<\/li>\n\n<li>Stress-kontrolleret pletteringskemi<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Material_Selection\"><\/span>Valg af materiale<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Materialer med lav Z-akse-ekspansion<\/li>\n\n<li>Laminater med h\u00f8j Tg for termisk stabilitet<\/li><\/ul><p>Producenter som TOPFAST integrerer overvejelser om p\u00e5lidelighed tidligt i procesplanl\u00e6gningen.<\/p><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"337\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures-2.jpg\" alt=\"PCB-fejl\" class=\"wp-image-5057\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures-2.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures-2-300x169.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures-2-18x10.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Relationship_to_Other_PCB_Failure_Modes\"><\/span>Forholdet til andre PCB-fejlmodi<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Via revner eksisterer ofte sammen med:<\/p><ul class=\"wp-block-list\"><li>Delaminering<\/li>\n\n<li>Dannelse af CAF<\/li>\n\n<li>Intermitterende \u00e5bne kredsl\u00f8b<\/li><\/ul><p><em>Relateret emne:<\/em><br><strong><a href=\"https:\/\/www.topfastpcb.com\/da\/blog\/pcb-delamination-causes-prevention\/\">PCB-delaminering - \u00e5rsager og forebyggelse<\/a><\/strong><\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Konklusion<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Revnede vias og t\u00f8nderevner er ikke tilf\u00e6ldige defekter, men forudsigelige resultater af <strong>termisk belastning, designbeslutninger og procesbegr\u00e6nsninger<\/strong>.<\/p><p>Gennem:<\/p><ul class=\"wp-block-list\"><li>Korrekt designpraksis<\/li>\n\n<li>Kontrollerede fremstillingsprocesser<\/li>\n\n<li>Passende materialevalg<\/li><\/ul><p>Forekomsten af dem kan reduceres betydeligt.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Via_Cracks_in_PCB_FAQ\"><\/span>Via revner i PCB FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2><div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1768981138484\"><strong class=\"schema-faq-question\">Q: Kan via revner repareres?<\/strong> <p class=\"schema-faq-answer\">N\u00e5r vias er revnet, kan de ikke repareres p\u00e5 en p\u00e5lidelig m\u00e5de.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1768981208332\"><strong class=\"schema-faq-question\">Q: <strong>F\u00f8rer alle via-revner til \u00f8jeblikkelig svigt?<\/strong><\/strong> <p class=\"schema-faq-answer\">Mange er latente og periodiske.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1768981226138\"><strong class=\"schema-faq-question\">Q: <strong>Er tykkere kobber altid bedre?<\/strong><\/strong> <p class=\"schema-faq-answer\">Svar: Ikke altid, men en tilstr\u00e6kkelig og ensartet tykkelse er afg\u00f8rende.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1768981244482\"><strong class=\"schema-faq-question\">Q: <strong>Er via-revner mere almindelige i blyfri montage?<\/strong><\/strong> <p class=\"schema-faq-answer\">Svar: Ja, p\u00e5 grund af h\u00f8jere reflow-temperaturer.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1768981259852\"><strong class=\"schema-faq-question\">Q: <strong>Kan r\u00f8ntgen detektere via revner?<\/strong><\/strong> <p class=\"schema-faq-answer\">Svar: Normalt ikke, medmindre revnerne er alvorlige.<\/p> <\/div> <\/div>","protected":false},"excerpt":{"rendered":"<p>Revnede vias og t\u00f8nderevner er hyppige PCB-fejl. Denne artikel unders\u00f8ger de grundl\u00e6ggende \u00e5rsager, detektionsteknikker og de forebyggende foranstaltninger, som producenterne anvender for at sikre p\u00e5lidelighed.<\/p>","protected":false},"author":1,"featured_media":5058,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[108],"tags":[438],"class_list":["post-5054","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-pcb-failures"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Cracked Vias and Barrel Cracks in PCB: Causes, Detection, and Prevention<\/title>\n<meta name=\"description\" content=\"Cracked vias and barrel cracks are common PCB reliability failures. 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