Absolutely. When we spend our hard earned $$$$, we shouldn't be seeing that. I don't know what procedure they used, but at ours, after the two halves of the converter were welded together and the converter was still hot and on the welding lathe, a plug was installed in the hub that allowed an air source apply air pressure to the converter. As the converter was slowly rotated, water was poured over the weld, and at hub weld. No bubbles, no leaks, next stop paint and balancing, any air bubbles, converter rejected.