{"id":7675,"date":"2026-09-08T03:22:12","date_gmt":"2026-09-08T03:22:12","guid":{"rendered":"https:\/\/chinametalfoundry.com\/?p=7675"},"modified":"2026-09-08T03:22:12","modified_gmt":"2026-09-08T03:22:12","slug":"defectos-comunes-en-la-fundicion-y-como-evitarlos","status":"publish","type":"post","link":"https:\/\/chinametalfoundry.com\/es\/blog\/common-casting-defects-and-how-to-avoid-them\/","title":{"rendered":"Defectos comunes en la fundici\u00f3n y c\u00f3mo evitarlos"},"content":{"rendered":"<p><!-- ============================================================ common-casting-defects-and-how-to-avoid-them \u7126\u70b9\u5173\u952e\u8bcd: casting defects ============================================================ --><\/p>\n<article class=\"sc-article\" style=\"max-width: 820px; margin: 0 auto; font-family: 'Poppins',sans-serif; color: #7e7e7e; font-size: 16px; line-height: 1.7;\">\n<div class=\"sc-intro\" style=\"background: #F5F5F5; border-radius: 20px; padding: 22px 24px; font-style: italic; color: #3a3a3a; margin: 0 0 26px; line-height: 1.6;\">\n<p style=\"margin: 0;\">A typical B2B buyer loses <strong style=\"color: #273171;\">3\u20138% of casting output<\/strong> to <strong style=\"color: #273171;\">defectos de fundici\u00f3n<\/strong> every month \u2014 gas porosity, shrinkage, sand inclusions, cold shuts, cracks. Each rejected part burns raw material, energy, machining hours, and most painfully, the delivery slot. This guide walks you through the eight casting defects that drive the majority of scrap, why they appear, and the process controls that actually prevent them on a real shop floor.<\/p>\n<\/div>\n<p style=\"margin: 0 0 18px;\">Whether you run <a style=\"color: #086ad4; text-decoration: none;\" href=\"\/es\/blog\/fundicion-en-arena-vs-fundicion-a-la-cera-perdida\/\" target=\"_blank\" rel=\"noopener\">sand castings or investment castings<\/a>, the same defect families show up \u2014 they just hide in different places. Below we map each defect to its root cause, the inspection method that catches it, and the prevention tactic our foundry engineers apply on every quote. We reference <a style=\"color: #086ad4; text-decoration: none;\" href=\"https:\/\/www.afsinc.org\" target=\"_blank\" rel=\"noopener\">AFS (American Foundry Society)<\/a> defect classifications and NADCA acceptance criteria so the numbers you see are not made up.<\/p>\n<figure style=\"margin: 24px 0;\"><img decoding=\"async\" style=\"width: 100%; display: block; border-radius: 4px;\" src=\"https:\/\/chinametalfoundry.com\/wp-content\/uploads\/2026\/09\/fig1.webp\" alt=\"casting defects visual inspection on a machined metal part\" \/><figcaption style=\"font-size: 13px; color: #7e7e7e; text-align: center; margin-top: 8px;\">Figure 1 \u2014 Visual casting defects found during first-article inspection.<\/figcaption><\/figure>\n<h2 style=\"font-family: 'Poppins',sans-serif; color: #273171; font-size: 25px; font-weight: 600; line-height: 1.3; margin: 34px 0 14px; padding: 4px 0 4px 30px; background: linear-gradient(to right, #ff512f 0px, #dd2476 5px, transparent 5px);\">Why Casting Defects Happen in Modern Foundries<\/h2>\n<p style=\"margin: 0 0 18px;\">Most casting defects are not random. They fall into four root-cause buckets:<\/p>\n<ul style=\"margin: 0 0 18px; padding-left: 22px;\">\n<li style=\"margin: 0 0 8px;\"><strong style=\"color: #273171;\">Melt quality.<\/strong> Dissolved gas, oxide inclusions, and wrong pour temperature account for roughly 40% of casting defects in iron foundries and over 60% in aluminum foundries.<\/li>\n<li style=\"margin: 0 0 8px;\"><strong style=\"color: #273171;\">Mold and core.<\/strong> Moisture, low strength, wrong sand mix, or missing vents create gas porosity and sand inclusions \u2014 together the largest defect family in sand casting.<\/li>\n<li style=\"margin: 0 0 8px;\"><strong style=\"color: #273171;\">Solidification.<\/strong> Inadequate risering, hot spots, and section thickness transitions cause shrinkage porosity and hot tears.<\/li>\n<li style=\"margin: 0 0 8px;\"><strong style=\"color: #273171;\">Handling.<\/strong> Improper shake-out, cooling, fettling, or heat treatment introduces cracks and surface scale that did not exist at pour.<\/li>\n<\/ul>\n<p style=\"margin: 0 0 18px;\">The AFS Foundry Industry Benchmark reports an average <strong style=\"color: #273171;\">first-yield rate of 78\u201382%<\/strong> for iron sand castings, which means <strong style=\"color: #273171;\">defectos de fundici\u00f3n<\/strong> routinely claim 18\u201322% of poured weight before scrap recovery. A disciplined shop will hit 92\u201396% first yield on the same part by controlling the four buckets above.<\/p>\n<h3 style=\"font-family: 'Poppins',sans-serif; color: #273171; font-size: 20px; font-weight: 600; line-height: 1.4; margin: 26px 0 8px; text-transform: capitalize;\">The Defect Family at a Glance<\/h3>\n<hr style=\"width: 100px; height: 4px; background: #EF890D; border: none; border-radius: 2px; margin: 0 0 14px; line-height: 0; opacity: 1;\" \/>\n<table style=\"width: 100%; border-collapse: collapse; margin: 18px 0 24px; font-size: 15px; color: #333333;\">\n<thead>\n<tr>\n<th style=\"background: #273171; color: #ffffff; padding: 12px 14px; text-align: left; font-weight: 600; border: 1px solid #273171;\">Defect Family<\/th>\n<th style=\"background: #273171; color: #ffffff; padding: 12px 14px; text-align: left; font-weight: 600; border: 1px solid #273171;\">Typical Root Cause<\/th>\n<th style=\"background: #273171; color: #ffffff; padding: 12px 14px; text-align: left; font-weight: 600; border: 1px solid #273171;\">Where It Hides<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border: 1px solid #E5E5E5; padding: 10px 14px;\">Gas porosity<\/td>\n<td style=\"border: 1px solid #E5E5E5; padding: 10px 14px;\">Dissolved hydrogen \/ nitrogen; wet sand<\/td>\n<td style=\"border: 1px solid #E5E5E5; padding: 10px 14px;\">Subsurface, machined faces<\/td>\n<\/tr>\n<tr style=\"background: #F5F5F5;\">\n<td style=\"border: 1px solid #E5E5E5; padding: 10px 14px;\">Shrinkage porosity<\/td>\n<td style=\"border: 1px solid #E5E5E5; padding: 10px 14px;\">Insufficient risering \/ hot spots<\/td>\n<td style=\"border: 1px solid #E5E5E5; padding: 10px 14px;\">Heavy sections, junctions<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #E5E5E5; padding: 10px 14px;\">Sand inclusions<\/td>\n<td style=\"border: 1px solid #E5E5E5; padding: 10px 14px;\">Mold erosion, low sand strength<\/td>\n<td style=\"border: 1px solid #E5E5E5; padding: 10px 14px;\">Surface, fillet zones<\/td>\n<\/tr>\n<tr style=\"background: #F5F5F5;\">\n<td style=\"border: 1px solid #E5E5E5; padding: 10px 14px;\">Cold shut \/ misrun<\/td>\n<td style=\"border: 1px solid #E5E5E5; padding: 10px 14px;\">Low pour temp, thin sections<\/td>\n<td style=\"border: 1px solid #E5E5E5; padding: 10px 14px;\">Thin walls, far from gate<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #E5E5E5; padding: 10px 14px;\">Hot tears \/ cracks<\/td>\n<td style=\"border: 1px solid #E5E5E5; padding: 10px 14px;\">Restrained shrinkage, wrong alloy<\/td>\n<td style=\"border: 1px solid #E5E5E5; padding: 10px 14px;\">Corners, junctions, long spans<\/td>\n<\/tr>\n<tr style=\"background: #F5F5F5;\">\n<td style=\"border: 1px solid #E5E5E5; padding: 10px 14px;\">Inclusions \/ oxides<\/td>\n<td style=\"border: 1px solid #E5E5E5; padding: 10px 14px;\">Pour stream turbulence, slag<\/td>\n<td style=\"border: 1px solid #E5E5E5; padding: 10px 14px;\">Machined bores, fillets<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #E5E5E5; padding: 10px 14px;\">Surface roughness<\/td>\n<td style=\"border: 1px solid #E5E5E5; padding: 10px 14px;\">Coarse sand, poor facing<\/td>\n<td style=\"border: 1px solid #E5E5E5; padding: 10px 14px;\">All external surfaces<\/td>\n<\/tr>\n<tr style=\"background: #F5F5F5;\">\n<td style=\"border: 1px solid #E5E5E5; padding: 10px 14px;\">Dimensional error<\/td>\n<td style=\"border: 1px solid #E5E5E5; padding: 10px 14px;\">Pattern wear, wrong shrinkage<\/td>\n<td style=\"border: 1px solid #E5E5E5; padding: 10px 14px;\">Across critical dimensions<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 style=\"font-family: 'Poppins',sans-serif; color: #273171; font-size: 25px; font-weight: 600; line-height: 1.3; margin: 34px 0 14px; padding: 4px 0 4px 30px; background: linear-gradient(to right, #ff512f 0px, #dd2476 5px, transparent 5px);\">The 8 Most Common Casting Defects and How to Prevent Them<\/h2>\n<p style=\"margin: 0 0 18px;\">Walk into any foundry QC lab and you will see the same eight <strong style=\"color: #273171;\">defectos de fundici\u00f3n<\/strong> on the reject table. Here is how each one forms and what controls actually work.<\/p>\n<h3 style=\"font-family: 'Poppins',sans-serif; color: #273171; font-size: 20px; font-weight: 600; line-height: 1.4; margin: 26px 0 8px; text-transform: capitalize;\">1. Gas porosity \u2014 the hidden killer<\/h3>\n<hr style=\"width: 100px; height: 4px; background: #EF890D; border: none; border-radius: 2px; margin: 0 0 14px; line-height: 0; opacity: 1;\" \/>\n<p style=\"margin: 0 0 18px;\">Pin-holes or sponge-like voids just under the surface. In aluminum alloys, hydrogen solubility drops from roughly <strong style=\"color: #273171;\">0.7 cm\u00b3\/100 g in liquid<\/strong> to <strong style=\"color: #273171;\">0.04 cm\u00b3\/100 g in solid<\/strong> \u2014 the rejected gas forms the voids. In iron, nitrogen from wet green sand or cold ladles is the usual culprit.<\/p>\n<p style=\"margin: 0 0 18px;\"><strong style=\"color: #273171;\">Prevention:<\/strong> degas aluminum with argon or nitrogen rotary impeller for 6\u201310 minutes; preheat ladles to \u2265250 \u00b0C; dry green-sand moisture below 4.0%; use AFS 2-fines-tested bentonite. For higher-grade work we run vacuum-assisted casting, which drops porosity to under 0.5% area fraction on radiograph. For a deeper dive into the mechanics behind these voids, read our guide on <a style=\"color: #086ad4; text-decoration: none;\" href=\"\/es\/blog\/sand-casting-porosity-and-shrinkage\/\" target=\"_blank\" rel=\"noopener\">sand casting porosity and shrinkage control<\/a>.<\/p>\n<h3 style=\"font-family: 'Poppins',sans-serif; color: #273171; font-size: 20px; font-weight: 600; line-height: 1.4; margin: 26px 0 8px; text-transform: capitalize;\">2. Shrinkage porosity \u2014 the geometry problem<\/h3>\n<hr style=\"width: 100px; height: 4px; background: #EF890D; border: none; border-radius: 2px; margin: 0 0 14px; line-height: 0; opacity: 1;\" \/>\n<p style=\"margin: 0 0 18px;\">Internal voids clustered in the last-to-freeze region. They appear when risers freeze before the casting or when section changes trap a hot spot. A 1% volume shrinkage that cannot feed through a 5 mm channel will become a defect \u2014 the modulus rule of <strong style=\"color: #273171;\">Mc \/ Mr \u2265 1.2<\/strong> is the foundry&#8217;s north star for riser sizing.<\/p>\n<p style=\"margin: 0 0 18px;\"><strong style=\"color: #273171;\">Prevention:<\/strong> run MAGMA or Flow-3D simulation on every part over 50 kg; add chills or insulating sleeves at hot spots; switch riser placement from blind to top riser where geometry allows.<\/p>\n<h3 style=\"font-family: 'Poppins',sans-serif; color: #273171; font-size: 20px; font-weight: 600; line-height: 1.4; margin: 26px 0 8px; text-transform: capitalize;\">3. Sand inclusions \u2014 the surface wrecker<\/h3>\n<hr style=\"width: 100px; height: 4px; background: #EF890D; border: none; border-radius: 2px; margin: 0 0 14px; line-height: 0; opacity: 1;\" \/>\n<p style=\"margin: 0 0 18px;\">Loose sand grains or lumps embedded in the casting surface, usually at fillets and lower drag faces. AFS reports sand inclusions account for <strong style=\"color: #273171;\">15\u201325% of sand casting rejects<\/strong> in general-purpose foundries.<\/p>\n<p style=\"margin: 0 0 18px;\"><strong style=\"color: #273171;\">Prevention:<\/strong> increase green compression strength to 18\u201322 psi; reduce pouring height (target \u2264150 mm above the sprue); add filters in the runner; apply zircon or chromite facing on critical faces.<\/p>\n<h3 style=\"font-family: 'Poppins',sans-serif; color: #273171; font-size: 20px; font-weight: 600; line-height: 1.4; margin: 26px 0 8px; text-transform: capitalize;\">4. Cold shuts and misruns<\/h3>\n<hr style=\"width: 100px; height: 4px; background: #EF890D; border: none; border-radius: 2px; margin: 0 0 14px; line-height: 0; opacity: 1;\" \/>\n<p style=\"margin: 0 0 18px;\">Two metal streams that meet without fusing, leaving a seam or unfilled region. Common in thin-wall investment castings where section thickness drops below <strong style=\"color: #273171;\">3 mm<\/strong> or when pour temperature is more than 50 \u00b0C below the alloy&#8217;s liquidus.<\/p>\n<p style=\"margin: 0 0 18px;\"><strong style=\"color: #273171;\">Prevention:<\/strong> bump pour temperature 20\u201340 \u00b0C; add fillet radii of \u22652 mm at section changes; use preheated molds; consider bottom-gating instead of parting-line gating for thin sections.<\/p>\n<h3 style=\"font-family: 'Poppins',sans-serif; color: #273171; font-size: 20px; font-weight: 600; line-height: 1.4; margin: 26px 0 8px; text-transform: capitalize;\">5. Hot tears and cracks<\/h3>\n<hr style=\"width: 100px; height: 4px; background: #EF890D; border: none; border-radius: 2px; margin: 0 0 14px; line-height: 0; opacity: 1;\" \/>\n<p style=\"margin: 0 0 18px;\">Cracks that open in the solid-state range when the casting cannot shrink freely. Long flat sections, L-junctions, and alloys with wide freezing ranges (e.g. <strong style=\"color: #273171;\">Al-7%Si, ASTM A536 60-40-18<\/strong>) are the usual suspects. Choosing the right <a style=\"color: #086ad4; text-decoration: none;\" href=\"\/es\/blog\/como-elegir-una-aleacion-para-fundicion\/\" target=\"_blank\" rel=\"noopener\">casting alloy<\/a> up front avoids many of these crack modes before tooling is even cut.<\/p>\n<p style=\"margin: 0 0 18px;\"><strong style=\"color: #273171;\">Prevention:<\/strong> redesign with uniform section thickness; add fillets of \u22653 mm at all junctions; use lower-carbon equivalent iron for thick castings; control shake-out timing (do not strip at peak stress).<\/p>\n<h3 style=\"font-family: 'Poppins',sans-serif; color: #273171; font-size: 20px; font-weight: 600; line-height: 1.4; margin: 26px 0 8px; text-transform: capitalize;\">6. Oxide and slag inclusions<\/h3>\n<hr style=\"width: 100px; height: 4px; background: #EF890D; border: none; border-radius: 2px; margin: 0 0 14px; line-height: 0; opacity: 1;\" \/>\n<p style=\"margin: 0 0 18px;\">Dark stringers or patches exposed during machining. They form when the pour stream oxidizes (especially in aluminum and low-carbon steel) or when slag carries over from the ladle.<\/p>\n<p style=\"margin: 0 0 18px;\"><strong style=\"color: #273171;\">Prevention:<\/strong> use a ceramic foam filter in the runner system; pour via bottom-pour ladles for steel; skim slag thoroughly and add a teapot spout for clean transfer.<\/p>\n<h3 style=\"font-family: 'Poppins',sans-serif; color: #273171; font-size: 20px; font-weight: 600; line-height: 1.4; margin: 26px 0 8px; text-transform: capitalize;\">7. Surface roughness and rat-tails<\/h3>\n<hr style=\"width: 100px; height: 4px; background: #EF890D; border: none; border-radius: 2px; margin: 0 0 14px; line-height: 0; opacity: 1;\" \/>\n<p style=\"margin: 0 18px;\">A coarse, pebbly finish \u2014 or worse, deep buckles called rat-tails from sand expansion. <strong style=\"color: #273171;\">Surface finish drives machining allowance<\/strong>: too rough and you machine away tolerance; too smooth and you have overpaid for an unnecessary finish.<\/p>\n<p style=\"margin: 0 0 18px;\"><strong style=\"color: #273171;\">Prevention:<\/strong> refine AFS grain fineness number (GFN) from ~70 to 90 for finish-critical faces; add 2\u20134% sea coal or replaceable resin; calibrate moisture to \u00b10.2% on the muller; use a sand mould hardness tester to verify uniform ramming.<\/p>\n<h3 style=\"font-family: 'Poppins',sans-serif; color: #273171; font-size: 20px; font-weight: 600; line-height: 1.4; margin: 26px 0 8px; text-transform: capitalize;\">8. Dimensional error \u2014 the silent scrap<\/h3>\n<hr style=\"width: 100px; height: 4px; background: #EF890D; border: none; border-radius: 2px; margin: 0 0 14px; line-height: 0; opacity: 1;\" \/>\n<p style=\"margin: 0 0 18px;\">A part that looks fine but fails the CMM. Cause is usually pattern wear, incorrect shrinkage allowance, or flask shift. Iron foundries typically use <strong style=\"color: #273171;\">1.0% shrinkage<\/strong>, steel <strong style=\"color: #273171;\">1.5\u20132.0%<\/strong>, aluminum <strong style=\"color: #273171;\">1.0\u20131.3%<\/strong> \u2014 but every pattern should be verified against a first-article before serial production.<\/p>\n<p style=\"margin: 0 0 18px;\"><strong style=\"color: #273171;\">Prevention:<\/strong> re-measure patterns every 500 pulls; track shrinkage allowance per alloy; use metal match plates for tight-tolerance runs; inspect first article with a CMM and compare to the 3D model within \u00b10.3 mm before releasing serial production.<\/p>\n<figure style=\"margin: 24px 0;\"><img decoding=\"async\" style=\"width: 100%; display: block; border-radius: 4px;\" src=\"https:\/\/chinametalfoundry.com\/wp-content\/uploads\/2026\/09\/fig2.webp\" alt=\"casting defects comparison good versus bad castings side by side\" \/><figcaption style=\"font-size: 13px; color: #7e7e7e; text-align: center; margin-top: 8px;\">Figure 2 \u2014 Side-by-side comparison of a defect-free casting (left) and one rejected for casting defects (right).<\/figcaption><\/figure>\n<h2 style=\"font-family: 'Poppins',sans-serif; color: #273171; font-size: 25px; font-weight: 600; line-height: 1.3; margin: 34px 0 14px; padding: 4px 0 4px 30px; background: linear-gradient(to right, #ff512f 0px, #dd2476 5px, transparent 5px);\">How to Build a Defect-Prevention Workflow That Actually Works<\/h2>\n<p style=\"margin: 0 0 18px;\">Knowing the eight <strong style=\"color: #273171;\">defectos de fundici\u00f3n<\/strong> is one thing. Building a system that catches them before the customer does is the real game. Below is the four-step workflow we apply to every new part at Supro MFG, and that you can adapt to any foundry partner.<\/p>\n<h3 style=\"font-family: 'Poppins',sans-serif; color: #273171; font-size: 20px; font-weight: 600; line-height: 1.4; margin: 26px 0 8px; text-transform: capitalize;\">Step 1 \u2014 Simulate before you sample<\/h3>\n<hr style=\"width: 100px; height: 4px; background: #EF890D; border: none; border-radius: 2px; margin: 0 0 14px; line-height: 0; opacity: 1;\" \/>\n<p style=\"margin: 0 0 18px;\">Run filling and solidification simulation on every part over 25 kg or with section thickness transitions greater than 2:1. Pour MAGMA, Flow-3D, or ProCAST, then iterate the gating and riser layout until the simulation shows hot spots covered. Sampling without simulation is gambling \u2014 sampling after simulation is engineering.<\/p>\n<h3 style=\"font-family: 'Poppins',sans-serif; color: #273171; font-size: 20px; font-weight: 600; line-height: 1.4; margin: 26px 0 8px; text-transform: capitalize;\">Step 2 \u2014 Sample, section, and inspect<\/h3>\n<hr style=\"width: 100px; height: 4px; background: #EF890D; border: none; border-radius: 2px; margin: 0 0 14px; line-height: 0; opacity: 1;\" \/>\n<p style=\"margin: 0 0 18px;\">Pour at least 5 samples, then section one of them at the predicted hot spots. Use radiographic (RT) or ultrasonic (UT) inspection per ASTM E192\/E114 to confirm no internal <strong style=\"color: #273171;\">defectos de fundici\u00f3n<\/strong>. Save metallographic samples \u2014 a 30-second mount can save a 30-day production run.<\/p>\n<h3 style=\"font-family: 'Poppins',sans-serif; color: #273171; font-size: 20px; font-weight: 600; line-height: 1.4; margin: 26px 0 8px; text-transform: capitalize;\">Step 3 \u2014 Lock the process window<\/h3>\n<hr style=\"width: 100px; height: 4px; background: #EF890D; border: none; border-radius: 2px; margin: 0 0 14px; line-height: 0; opacity: 1;\" \/>\n<p style=\"margin: 0 0 18px;\">Pour temperature \u00b110 \u00b0C, sand moisture \u00b10.2%, tensile bar on every batch, melt chemistry check by spectrometer every heat. The process window is what separates a 90% first-yield shop from a 99% first-yield shop. When in doubt, write the parameter down \u2014 undocumented parameters drift.<\/p>\n<h3 style=\"font-family: 'Poppins',sans-serif; color: #273171; font-size: 20px; font-weight: 600; line-height: 1.4; margin: 26px 0 8px; text-transform: capitalize;\">Step 4 \u2014 Continuous SPC on serial production<\/h3>\n<hr style=\"width: 100px; height: 4px; background: #EF890D; border: none; border-radius: 2px; margin: 0 0 14px; line-height: 0; opacity: 1;\" \/>\n<p style=\"margin: 0 0 18px;\">Track first-yield rate weekly, scrap cost per ton monthly, and customer rejection rate per quarter. A 1% rise in first-yield is roughly <strong style=\"color: #273171;\">$15\u201330 saved per ton<\/strong> on material plus another $50\u2013100 on energy and labor. The math justifies the SPC discipline. For more on how casting process choice affects defect risk, see our <a style=\"color: #086ad4; text-decoration: none;\" href=\"\/es\/blog\/guia-de-fundicion-de-metales\/\" target=\"_blank\" rel=\"noopener\">complete metal casting guide<\/a>.<\/p>\n<h2 style=\"font-family: 'Poppins',sans-serif; color: #273171; font-size: 25px; font-weight: 600; line-height: 1.3; margin: 34px 0 14px; padding: 4px 0 4px 30px; background: linear-gradient(to right, #ff512f 0px, #dd2476 5px, transparent 5px);\">Preguntas frecuentes<\/h2>\n<h3 style=\"font-family: 'Poppins',sans-serif; color: #273171; font-size: 20px; font-weight: 600; line-height: 1.4; margin: 22px 0 8px;\">What is the most common casting defect?<\/h3>\n<p style=\"margin: 0 0 18px;\">Across sand and investment casting, gas porosity is the single most common defect, with sand inclusions a close second. Together they account for roughly <strong style=\"color: #273171;\">50\u201360% of all casting defects<\/strong> in gray and ductile iron foundries, and an even higher share in aluminum foundries where dissolved hydrogen dominates. For aluminum-specific failure modes and fixes, see our breakdown of <a style=\"color: #086ad4; text-decoration: none;\" href=\"\/es\/blog\/aluminum-casting-9-defects-solutions\/\" target=\"_blank\" rel=\"noopener\">aluminum casting defects and solutions<\/a>.<\/p>\n<h3 style=\"font-family: 'Poppins',sans-serif; color: #273171; font-size: 20px; font-weight: 600; line-height: 1.4; margin: 22px 0 8px;\">Can casting defects be repaired?<\/h3>\n<p style=\"margin: 0 0 18px;\">Some can \u2014 surface pores in non-critical areas are filled by welding or impregnation, and small cracks can be repaired by peening. However, internal porosity and hot tears typically cannot be reliably repaired and the part must be scrapped. Prevention is dramatically cheaper than rework, often by a factor of 10\u201320\u00d7.<\/p>\n<h3 style=\"font-family: 'Poppins',sans-serif; color: #273171; font-size: 20px; font-weight: 600; line-height: 1.4; margin: 22px 0 8px;\">How do you inspect a casting for internal defects?<\/h3>\n<p style=\"margin: 0 0 18px;\">Use radiographic testing (RT) per ASTM E192 for volumetric defects, ultrasonic testing (UT) per ASTM E114 for planar defects, and dye-penetrant or magnetic-particle for surface defects. For critical parts (aerospace, oil-and-gas) add CT scanning as the gold standard. The right method depends on the defect family you are looking for.<\/p>\n<h3 style=\"font-family: 'Poppins',sans-serif; color: #273171; font-size: 20px; font-weight: 600; line-height: 1.4; margin: 22px 0 8px;\">What is a good first-yield rate for castings?<\/h3>\n<p style=\"margin: 0 0 18px;\">AFS Foundry Industry Benchmark puts industry average first yield at <strong style=\"color: #273171;\">78\u201382%<\/strong> for iron and <strong style=\"color: #273171;\">70\u201380%<\/strong> for aluminum. A mature, well-controlled shop should reach 92\u201396%. Anything below 85% on a repeat part signals an unaddressed <strong style=\"color: #273171;\">casting defect<\/strong> mode that needs root-cause analysis.<\/p>\n\t\t<div data-elementor-type=\"section\" data-elementor-id=\"3550\" class=\"elementor elementor-3550\" data-elementor-post-type=\"elementor_library\">\n\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-19b1acf1 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"19b1acf1\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;ekit_has_onepagescroll_dot&quot;:&quot;yes&quot;}\">\n\t\t\t\t\t\t\t<div class=\"elementor-background-overlay\"><\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-56e26ed6\" data-id=\"56e26ed6\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-52c3d00c elementor-widget elementor-widget-elementskit-heading\" data-id=\"52c3d00c\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"elementskit-heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"ekit-wid-con\" ><div class=\"ekit-heading elementskit-section-title-wraper text_left   ekit_heading_tablet-   ekit_heading_mobile-\"><h3 class=\"ekit-heading--title elementskit-section-title\">\u00bfBusca una fundici\u00f3n de metales confiable en China?<\/h3><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-24c75aa0 elementor-widget elementor-widget-text-editor\" data-id=\"24c75aa0\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li>Podemos ayudarte a optimizar el dise\u00f1o de tus productos y a reducir costos.<\/li><li>Podemos ayudarte con piezas de fundici\u00f3n de alta calidad y en grandes cantidades.<\/li><li>Podemos entregar a tiempo y conseguir m\u00e1s oportunidades en el mercado de ventas.<\/li><li>Te beneficiar\u00e1s del servicio de fundici\u00f3n de metales de Supro MFG.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-51a20937 elementor-align-left elementor-widget elementor-widget-global elementor-global-1143 elementor-widget-button\" data-id=\"51a20937\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm elementor-animation-grow\" href=\"https:\/\/chinametalfoundry.com\/es\/contacto\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Solicitar una cotizaci\u00f3n directa de f\u00e1brica <\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t\n<p class=\"sc-note\" style=\"font-size: 13px; color: #9a9a9a; margin: 28px 0 0;\">*Data referenced from AFS Foundry Industry Benchmark, ASTM E192\/E114 inspection standards, and Supro MFG shop-floor records.<\/p>\n<\/article>","protected":false},"excerpt":{"rendered":"<p>A typical B2B buyer loses 3\u20138% of casting output to casting defects every month \u2014 gas porosity, shrinkage, sand inclusions, [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":7678,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[15],"tags":[48,47,49,42],"class_list":["post-7675","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blogs","tag-casting-comparison","tag-casting-process","tag-manufacturing-process","tag-metal-casting"],"_links":{"self":[{"href":"https:\/\/chinametalfoundry.com\/es\/wp-json\/wp\/v2\/posts\/7675","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/chinametalfoundry.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/chinametalfoundry.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/chinametalfoundry.com\/es\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/chinametalfoundry.com\/es\/wp-json\/wp\/v2\/comments?post=7675"}],"version-history":[{"count":6,"href":"https:\/\/chinametalfoundry.com\/es\/wp-json\/wp\/v2\/posts\/7675\/revisions"}],"predecessor-version":[{"id":7684,"href":"https:\/\/chinametalfoundry.com\/es\/wp-json\/wp\/v2\/posts\/7675\/revisions\/7684"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/chinametalfoundry.com\/es\/wp-json\/wp\/v2\/media\/7678"}],"wp:attachment":[{"href":"https:\/\/chinametalfoundry.com\/es\/wp-json\/wp\/v2\/media?parent=7675"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/chinametalfoundry.com\/es\/wp-json\/wp\/v2\/categories?post=7675"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/chinametalfoundry.com\/es\/wp-json\/wp\/v2\/tags?post=7675"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}