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The welding neck *** is an integral ***. It is no longer flexible after it has been welded onto the tube so that either the welding work is to be carried out with absolute accuracy or the entire tube has to be rotated when it is being fixed in place.
The pressed welding neck *** is an alternative to the welding neck ***. This is not conform with DIN or EN. It is only similar to DIN. The advantage here is that the *** ring is rotatable.
Pipelines can also be connected by means of a loose *** with a weld neck. It is flexible and is loosely suspended from the tube, as is the pressed loose ***.