Build-to-order products

Example solution 03

Request to reduce costs

Issue：
  • When inserting a round bar inside standard welded steel pipe, the bead (welded part) on the inner surface of the pipe blocks insertion.
  • Using seamless or drawn steel pipes unfortunately results in higher costs.

Cross-sectional shape of standard welded steel pipe


Okajima Pipe’s answer
  • 〈 Applied technology 〉
  • Proposal of bead-less welded steel pipe
  • We used our unique bead-less welded steel pipe, which can limit the beads that occur on the inner surface at the welding section.
  • We succeeded in making the inner surface bead section thinner than the thickness of the pipe. This made it possible to insert round bars, which reduced costs.

Cross-sectional shape of bead-less welded steel pipe

Types and features of steel pipes
Types of steel pipes Outer diameter precision Inner diameter precision Support for small-diameter pipe with thick walls Cost
Seamless steel pipe ○ △ ◎ High
Drawn steel pipe ◎ ◎ ○ High
Welded steel pipe with inner surface bead cut ○ △ × medium
Our bead-less welding steel pipe ◎ △ ○ low

Example solution