porosity can occur in all types of welding.there are many factors to be considered to minimize or eliminate it. stainless steel has different grades such as 304,309,316 etc. the welding electrode should be comparable. also cleanliness is important, remove any oils, water,chemicals or debris before welding. GTAW or "TIG" welding in stainless steel does not occur porosity because stainless steel is resistant to corrosion, porosity does not occur in metals having less than 15 % carbon in their composition.
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