In creating Daikure fin tubes (as shown in the photo), fins are wrapped around the pipes in a helical shape and the fins on one side are arc and fillet welded. With fillet welding, fin thickness is standard and length is determined, resulting in zero wrinkles in the fins.
The outward appearance is very beautiful, and the there is no damage to the pipes due to processing. As well various inspections are implemented following the strictest standards.