Is welding required on the inner side of socket welding?
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After welding the external end by socket welding, is it necessary to weld the internal end as well?
It is generally not necessary. But I have seen large-caliber ones that also have welds.
Are there specific regulations? What is the nominal diameter above which welding is also required?
It’s generally not used. Therefore, socket welding is generally not used for lubricating oil media to avoid interstitial corrosion.
No, socket welding is generally used for small-diameter pipes; for large-diameter pipes, can’t they just be welded directly?
There is no socket welding for large diameters; it seems that it’s not available for pipes over 50!