Socket welding flange may be a popular pipeline flange, originally developed to be used on small high-pressure pipelines. The manufacture of this sort of flange is analogous to the manufacture of sliding flanges. The lap welding flange can make sure the unobstructed hole and better fluid flow. within the case of internal welding, the static strength of the flange is adequate to the static strength of the flange, but its fatigue resistance is 50% above that of the double-welded flange. The flange are often easily obtained without chamfering the flange surface, and without grinding the socket welding flange after welding, which is required for detachable flanges. Overlapping welding flanges are almost like push-in flanges, but have a hole and a middle hole, which act as holes and hold the pipe in situ before welding, hence the name.

