SPIRAL WELDING
Our patented tapered spiral welding combines all of the production steps for making large diameter steel tubes into one process, greatly reducing the manufacturing cost, footprint, and time required to produce steel towers.
We have adapted spiral welding – a highly automated, proven process for producing cylindrical pipe and pilings – to accommodate the tapered diameter, variable wall thickness, and high manufacturing quality required for wind turbine towers.
A single machine completes the joining, rolling, fit-up, welding and severing of a tower section, resulting in continuous production of steel tower shells. Because it is a high throughput, compact system, tapered spiral welding provides economic benefits when operated in a factory setting, and can also be readily mobilized for temporary operations on-site (for onshore supply) or port-side (for offshore supply).
Our Process
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Our custom manufacturing equipment is designed and built by our team in Denver Colorado
Tapered spiral welding
Keystone’s patented breakthrough brings spiral welding into the wind industry with the introduction of variable diameters and wall thicknesses
Our Process
View fullsize
![]()
Our custom manufacturing equipment is designed and built by our team in Denver, Colorado.
Tapered spiral welding
Keystone’s patented breakthrough allows tapered towers with variable wall-thickness to be manufactured from constant width sheets of steel
As a result, Keystone can manufacture the lightest, lowest cost, and most structurally optimized towers in the industry.
Keystone’s manufacturing processes is covered by over 100 patents across more than 30 countries representing over 95% of the wind market.
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