{"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\/pt\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/","title":{"rendered":"Vias fissuradas e fissuras de barril em PCB"},"content":{"rendered":"<p>As vias fissuradas e as fissuras de barril est\u00e3o entre as mais cr\u00edticas <strong>falhas de fiabilidade latentes<\/strong> no fabrico de placas de circuito impresso.<\/p><p>Estes defeitos passam frequentemente nos testes el\u00e9ctricos iniciais mas falham mais tarde sob tens\u00e3o t\u00e9rmica ou mec\u00e2nica, o que os torna especialmente perigosos em aplica\u00e7\u00f5es de elevada fiabilidade.<\/p><p>Este artigo explica-o:<\/p><ul class=\"wp-block-list\"><li>O que s\u00e3o as fissuras de via e as fissuras de barril<\/li>\n\n<li>Porque \u00e9 que ocorrem<\/li>\n\n<li>Como s\u00e3o detectados<\/li>\n\n<li>Como \u00e9 que os fabricantes reduzem a sua ocorr\u00eancia<\/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=\"Falhas de PCB\" 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\">\u00cdndice<\/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\/pt\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#What_Are_Via_Cracks_and_Barrel_Cracks\" >O que s\u00e3o as fissuras de via e as fissuras de barril?<\/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\/pt\/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\/pt\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Barrel_Crack\" >Rachadura de barril<\/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\/pt\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Why_Via_Cracks_Are_a_Serious_Reliability_Issue\" >Porque \u00e9 que as fissuras na via s\u00e3o um grave problema de fiabilidade<\/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\/pt\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Primary_Causes_of_Via_and_Barrel_Cracks\" >Principais causas de fissuras na via e no barril<\/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\/pt\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Z-Axis_Expansion_Mismatch\" >Inadequa\u00e7\u00e3o da expans\u00e3o do eixo Z<\/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\/pt\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Thin_or_Non-Uniform_Copper_Plating\" >Revestimento de cobre fino ou n\u00e3o uniforme<\/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\/pt\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#High_Aspect_Ratio_Vias\" >Vias de elevada rela\u00e7\u00e3o de aspeto<\/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\/pt\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Excessive_Thermal_Cycling\" >Ciclo t\u00e9rmico excessivo<\/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\/pt\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Design_Factors_That_Increase_Via_Crack_Risk\" >Factores de conce\u00e7\u00e3o que aumentam o risco de fissuras na via<\/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\/pt\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#High-Risk_Design_Choices\" >Escolhas de conce\u00e7\u00e3o de alto risco<\/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\/pt\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Manufacturing_Factors_Contributing_to_Via_Cracks\" >Factores de fabrico que contribuem para as fissuras da via<\/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\/pt\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Drilling_Quality\" >Qualidade da perfura\u00e7\u00e3o<\/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\/pt\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Inadequate_Desmear_Process\" >Processo de descolora\u00e7\u00e3o inadequado<\/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\/pt\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Plating_Stress_Control\" >Controlo das tens\u00f5es de revestimento<\/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\/pt\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#How_Via_Cracks_Are_Detected\" >Como s\u00e3o detectadas as fissuras da Via<\/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\/pt\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Common_Detection_Methods\" >M\u00e9todos de dete\u00e7\u00e3o comuns<\/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\/pt\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Preventing_Cracked_Vias_and_Barrel_Cracks\" >Preven\u00e7\u00e3o de fissuras em Vias e Barris<\/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\/pt\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Design-Level_Prevention\" >Preven\u00e7\u00e3o ao n\u00edvel da conce\u00e7\u00e3o<\/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\/pt\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Process-Level_Prevention\" >Preven\u00e7\u00e3o ao n\u00edvel do processo<\/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\/pt\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Material_Selection\" >Sele\u00e7\u00e3o de materiais<\/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\/pt\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Relationship_to_Other_PCB_Failure_Modes\" >Rela\u00e7\u00e3o com outros modos de falha de PCB<\/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\/pt\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Conclusion\" >Conclus\u00e3o<\/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\/pt\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Via_Cracks_in_PCB_FAQ\" >Via Fissuras em 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>O que s\u00e3o as fissuras de via e as fissuras de barril?<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>Uma fissura numa via \u00e9 uma fratura no revestimento de cobre de uma via, normalmente na:<\/p><ul class=\"wp-block-list\"><li>O joelho da via<\/li>\n\n<li>A interface entre o cobre e o diel\u00e9trico<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Barrel_Crack\"><\/span>Rachadura de barril<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Uma fissura de cano refere-se especificamente a uma <strong>fenda circunferencial<\/strong> no tubo de via revestido.<\/p><p>Ambos interrompem a continuidade el\u00e9ctrica ao longo do tempo.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_Via_Cracks_Are_a_Serious_Reliability_Issue\"><\/span>Porque \u00e9 que as fissuras na via s\u00e3o um grave problema de fiabilidade<span class=\"ez-toc-section-end\"><\/span><\/h2><p>As fissuras nas vias s\u00e3o perigosas porque:<\/p><ul class=\"wp-block-list\"><li>S\u00e3o frequentemente intermitentes<\/li>\n\n<li>Agrava-se com o ciclo t\u00e9rmico<\/li>\n\n<li>S\u00e3o dif\u00edceis de detetar visualmente<\/li><\/ul><p>Frequentemente, s\u00f3 aparecem ap\u00f3s uma utiliza\u00e7\u00e3o no terreno ou um teste de esfor\u00e7o.<\/p><p><em>S\u00edntese de falhas:<\/em><br><strong><a href=\"https:\/\/www.topfastpcb.com\/pt\/blog\/common-pcb-failures-causes-solutions\/\">Explica\u00e7\u00e3o das falhas comuns de PCB<\/a><\/strong><\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Primary_Causes_of_Via_and_Barrel_Cracks\"><\/span>Principais causas de fissuras na via e no barril<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Z-Axis_Expansion_Mismatch\"><\/span>Inadequa\u00e7\u00e3o da expans\u00e3o do eixo Z<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Durante o aquecimento, os materiais diel\u00e9ctricos expandem-se mais do que o cobre no eixo Z.<\/p><p>A expans\u00e3o e a contra\u00e7\u00e3o repetidas criam tens\u00f5es no tubo da via.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Thin_or_Non-Uniform_Copper_Plating\"><\/span>Revestimento de cobre fino ou n\u00e3o uniforme<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Uma espessura de revestimento insuficiente reduz a capacidade da via para absorver tens\u00f5es mec\u00e2nicas.<\/p><p> <em>Detalhe do processo:<\/em><br><strong><a href=\"https:\/\/www.topfastpcb.com\/pt\/blog\/copper-plating-process-in-pcb-manufacturing-explained\/\">Processo de revestimento de cobre no fabrico de PCB<\/a><\/strong><\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"High_Aspect_Ratio_Vias\"><\/span>Vias de elevada rela\u00e7\u00e3o de aspeto<span class=\"ez-toc-section-end\"><\/span><\/h3><p>As vias de elevado r\u00e1cio de aspeto s\u00e3o mais dif\u00edceis de revestir uniformemente e sofrem maior tens\u00e3o.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Excessive_Thermal_Cycling\"><\/span>Ciclo t\u00e9rmico excessivo<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Exposi\u00e7\u00e3o repetida a:<\/p><ul class=\"wp-block-list\"><li>Soldadura por refluxo<\/li>\n\n<li>Ciclismo de pot\u00eancia<\/li>\n\n<li>Altera\u00e7\u00f5es da temperatura ambiente<\/li><\/ul><p>Acelera a forma\u00e7\u00e3o de fissuras.<\/p><p><em>Testes de fiabilidade:<\/em><br><strong><a href=\"https:\/\/www.topfastpcb.com\/pt\/blog\/pcb-reliability-testing-standards\/\">Teste de fiabilidade t\u00e9rmica de PCB<\/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=\"Falhas de PCB\" 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>Factores de conce\u00e7\u00e3o que aumentam o risco de fissuras na via<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Certas decis\u00f5es de conce\u00e7\u00e3o aumentam significativamente o risco.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"High-Risk_Design_Choices\"><\/span>Escolhas de conce\u00e7\u00e3o de alto risco<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Di\u00e2metros de via muito pequenos<\/li>\n\n<li>Espessura fina da placa de circuito impresso com vias profundas<\/li>\n\n<li>Grandes planos de cobre sem relevo<\/li>\n\n<li>Estruturas densas via-in-pad<\/li><\/ul><p>A an\u00e1lise da conce\u00e7\u00e3o para a fiabilidade \u00e9 fundamental.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Manufacturing_Factors_Contributing_to_Via_Cracks\"><\/span>Factores de fabrico que contribuem para as fissuras da via<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Drilling_Quality\"><\/span>Qualidade da perfura\u00e7\u00e3o<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Manchas de broca, paredes de orif\u00edcios rugosas ou arrancamento de fibras enfraquecem a ades\u00e3o do cobre.<\/p><p><em>Compara\u00e7\u00e3o:<\/em><br><strong><a href=\"https:\/\/www.topfastpcb.com\/pt\/blog\/pcb-drilling-vs-laser-drilling\/\">Perfura\u00e7\u00e3o de PCB vs Perfura\u00e7\u00e3o a laser<\/a><\/strong><\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Inadequate_Desmear_Process\"><\/span>Processo de descolora\u00e7\u00e3o inadequado<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Uma m\u00e1 descolora\u00e7\u00e3o impede a liga\u00e7\u00e3o adequada do cobre ao diel\u00e9trico.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Plating_Stress_Control\"><\/span>Controlo das tens\u00f5es de revestimento<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Uma qu\u00edmica de revestimento incorrecta pode introduzir tens\u00f5es internas nos dep\u00f3sitos de cobre.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Via_Cracks_Are_Detected\"><\/span>Como s\u00e3o detectadas as fissuras da Via<span class=\"ez-toc-section-end\"><\/span><\/h2><p>As fissuras de via raramente s\u00e3o detectadas apenas pela inspe\u00e7\u00e3o da superf\u00edcie.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Common_Detection_Methods\"><\/span>M\u00e9todos de dete\u00e7\u00e3o comuns<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Ensaios de stress t\u00e9rmico<\/li>\n\n<li>An\u00e1lise de micro-sec\u00e7\u00f5es<\/li>\n\n<li>Ensaios el\u00e9ctricos ap\u00f3s o ciclo<\/li>\n\n<li>Inspe\u00e7\u00e3o por raios X (efic\u00e1cia limitada)<\/li><\/ul><p><em>S\u00edntese da inspe\u00e7\u00e3o:<\/em><br><strong><a href=\"https:\/\/www.topfastpcb.com\/pt\/blog\/pcb-inspection-and-testing\/\">Explica\u00e7\u00e3o da inspe\u00e7\u00e3o e dos testes de PCB<\/a><\/strong><\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Preventing_Cracked_Vias_and_Barrel_Cracks\"><\/span>Preven\u00e7\u00e3o de fissuras em Vias e Barris<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Design-Level_Prevention\"><\/span>Preven\u00e7\u00e3o ao n\u00edvel da conce\u00e7\u00e3o<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Di\u00e2metro adequado da via<\/li>\n\n<li>R\u00e1cio de aspeto controlado<\/li>\n\n<li>Padr\u00f5es de al\u00edvio t\u00e9rmico<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Process-Level_Prevention\"><\/span>Preven\u00e7\u00e3o ao n\u00edvel do processo<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Par\u00e2metros de perfura\u00e7\u00e3o optimizados<\/li>\n\n<li>Espessura uniforme do revestimento de cobre<\/li>\n\n<li>Qu\u00edmica de revestimento com controlo de tens\u00f5es<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Material_Selection\"><\/span>Sele\u00e7\u00e3o de materiais<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Materiais com baixa expans\u00e3o do eixo Z<\/li>\n\n<li>Laminados de alta Tg para estabilidade t\u00e9rmica<\/li><\/ul><p>Fabricantes como a TOPFAST integram considera\u00e7\u00f5es de fiabilidade desde o in\u00edcio do planeamento do processo.<\/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=\"Falhas de PCB\" 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>Rela\u00e7\u00e3o com outros modos de falha de PCB<span class=\"ez-toc-section-end\"><\/span><\/h2><p>As fissuras da via coexistem frequentemente com:<\/p><ul class=\"wp-block-list\"><li>Delamina\u00e7\u00e3o<\/li>\n\n<li>Forma\u00e7\u00e3o de CAF<\/li>\n\n<li>Circuitos abertos intermitentes<\/li><\/ul><p><em>T\u00f3pico relacionado:<\/em><br><strong><a href=\"https:\/\/www.topfastpcb.com\/pt\/blog\/pcb-delamination-causes-prevention\/\">Causas e preven\u00e7\u00e3o da delamina\u00e7\u00e3o de PCB<\/a><\/strong><\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclus\u00e3o<span class=\"ez-toc-section-end\"><\/span><\/h2><p>As vias fissuradas e as fissuras em barril n\u00e3o s\u00e3o defeitos aleat\u00f3rios, mas resultados previs\u00edveis de <strong>tens\u00e3o t\u00e9rmica, decis\u00f5es de conce\u00e7\u00e3o e limita\u00e7\u00f5es do processo<\/strong>.<\/p><p>Atrav\u00e9s de:<\/p><ul class=\"wp-block-list\"><li>Pr\u00e1ticas de conce\u00e7\u00e3o adequadas<\/li>\n\n<li>Processos de fabrico controlados<\/li>\n\n<li>Sele\u00e7\u00e3o adequada de materiais<\/li><\/ul><p>A sua ocorr\u00eancia pode ser significativamente reduzida.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Via_Cracks_in_PCB_FAQ\"><\/span>Via Fissuras em 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\">P: As fissuras da via podem ser reparadas?<\/strong> <p class=\"schema-faq-answer\">R: N\u00e3o. Uma vez fissuradas, as vias n\u00e3o podem ser reparadas de forma fi\u00e1vel.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1768981208332\"><strong class=\"schema-faq-question\">Q: <strong>Todas as fissuras de via provocam uma falha imediata?<\/strong><\/strong> <p class=\"schema-faq-answer\">R: N\u00e3o. Muitos s\u00e3o latentes e intermitentes.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1768981226138\"><strong class=\"schema-faq-question\">Q: <strong>O cobre mais espesso \u00e9 sempre melhor?<\/strong><\/strong> <p class=\"schema-faq-answer\">R: Nem sempre, mas uma espessura suficiente e uniforme \u00e9 fundamental.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1768981244482\"><strong class=\"schema-faq-question\">Q: <strong>As fissuras de via s\u00e3o mais comuns na montagem sem chumbo?<\/strong><\/strong> <p class=\"schema-faq-answer\">R: Sim, devido a temperaturas de refluxo mais elevadas.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1768981259852\"><strong class=\"schema-faq-question\">Q: <strong>Os raios X podem detetar fissuras?<\/strong><\/strong> <p class=\"schema-faq-answer\">R: Normalmente n\u00e3o, a menos que as fissuras sejam graves.<\/p> <\/div> <\/div>","protected":false},"excerpt":{"rendered":"<p>As vias fissuradas e as fissuras em barril s\u00e3o falhas frequentes nas PCB. Este artigo explora as suas causas, as t\u00e9cnicas de dete\u00e7\u00e3o e as medidas preventivas que os fabricantes utilizam para garantir a fiabilidade.<\/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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