We will let the photos speak for themsevles.
I have never dealt with ceramic tape welds before. One side came out perfect one side failed miserably. Perfect side was root passed same day tape was installed other side was rooted one day later. Our speculation is that the tape absorbed moisture overnight and the water steamed out during the welding process to cause porosity. It is the only thing we can come up with that doesn't involve shielding gas coverage problems. We're just trying to stick the shipyard for the bill for the rework because this is clearly unacceptable. Process is .052 ESAB dual shield wire with CO2 shield on ceramic tape, 3/8" thick plate.