It is the problem of sand mold, or the flow speed of the metal is too high, so could be solved by foundries. ![]() The sand dropped from sand molds, rolling into the liquid metal, then caused sand holes. Holes after sand blasting or machining process. Sand hole is a type of typical shrinkage cavity defect. The metal has penetrated into sand molds.īlacking scab. Normally, you could see extra metal materials at the corner positions. ![]() If the surface is flat, our dandong foundry could inspect them by ultrasonic flaw detector.Ĭhemical burn-on, and metal penetration. The most of subsurface blowholes could be found after machining or grinding. Subsurface blowhole only can be seen after machining or grinding. Pinhole is very tiny hole, some could be seen on the surface. Is a kind of cavities defect, which is also divided into ![]() On the surface and inside of cast iron and cast steel parts. ┆ About Us ┆ Casting Products ┆ Casting Workshop ┆ Machining Workshop ┆ Inspection ┆ Certificate ┆ Blog Articles ┆ Contact Us ┆Ĭasting defects with many pictures by Dandong Foundry in Casting Defects - Sand Mold, Metal Casting
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