Short answer: Porosity is the network of gas and shrinkage voids trapped inside castings and welds; it weakens the section, leaks under pressure and ruins pressure-tight parts, so it is prevented by melting, gating and welding discipline and found via NDT.
At a Glance
Types of Porosity
Gas porosity comes from dissolved hydrogen/moisture; shrinkage porosity from poor feeding. Both appear in Weld Defects Guide и Aluminum Casting Defects Guide, and reduce Yield Strength Vs Tensile Strength and pressure integrity.
Preventing Porosity
Dry flux and degas melts (Casting Supplier), design risers/chills, keep welds clean and dry (Как сварить алюминий, Metal Degreasing Guide), and control solidification. Relate to Metal Formability Guide only indirectly.
Detection & Supply
Find porosity by radiography/UT via Metal Ndt Guide, quantify per Mill Test Certificate Guide, and read failures in Metal Failure Analysis Guide. HXSCO supplies low-porosity cast and welded parts with NDT records.
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Часто задаваемые вопросы
Gas or shrinkage voids trapped inside a casting or weld, weakening the section and causing leaks.
Moisture, dirty base metal, damp shielding gas and poor technique entrain gas.
Dry flux, degas the melt, good gating/risers and controlled solidification.
Radiography, ultrasonic testing and pressure testing — part of NDT.
HXSCO supplies cast and welded parts with NDT porosity records on request.
Source Sound Metal from HXSCO
HXSCO supplies low-porosity cast and welded components with NDT porosity records. Send your specification and quantity for a quote.