Flange connection having a weld ring gasket

A flange connection comprising:

• (a) first and second flanges;
• and
• (b) a weld ring gasket arranged between the first and second flanges and comprising a first weld ring half arranged on top of a second weld ring half;
• wherein the first weld ring half comprises a first base section and a first lip arranged on the first base section and the second weld ring half comprises a second base section and a second lip arranged on top of the second base section;
• wherein the first base section is welded to the first flange by way of a first fillet weld and the second base section is welded to the second flange by way of a second fillet;
• wherein the first and second lips form a torus-shaped connection section having a hollow interior, and the first and second weld ring halves are welded to each other at the torus-shaped connection section by way of a caulking seam;
• and
• wherein the torus-shaped connection section lies radially inside the first and second weld ring halves,
• wherein each of the first and second base sections has a respective first contact surface that lie against each other;
• wherein at least one of the first contact surfaces has a setback that extends in a vertical direction;
• and
• wherein a ring gap that is open radially outward is formed between the first and second weld ring halves.