Black rings

Since 1905, the name Siegthaler has stood for the highest quality at all production stages. In 1938, we started to bend and
weld rings for the following sectors:

Tank and apparatus construction
Industrial furnaces
Mechanical engineering
Pipeline construction
Wind turbines


Siegthaler’s machinery enables them to bend and weld rings with an internal diameter of 500mm right up to an external diameter of 7,000mm.
Depending on the raw material and the bending diameter cross sections of up to 65,000 mm² are processed.
They also process seamless rolled rings and flame-cut material with a diameter of up to 8,000mm and a unit weight of up to 50 tons.