Menu

Fin Designs

The main purpose of the fin passes is to condition the strip edges to prepare them for welding. The process must reduce the strip girth against the fin blade to accomplish this, and properly set the body of the strip. Fin passes generate a great deal of drive if used properly.

A standard fin blade works the entire strip edge and prepares it for welding.  A straight fin or one with altered angles is used to work the inside edges of the strip to reduce the I.D. bead. Special attention must be used in setup to avoid having a cold I.D. weld and possible cracks. A round fin pass design is most recommended unless the mill does not have side passes or there is a reason to use another style.

Low-bead fin blades are made when the customer wants to control the I.D. weld flash of the tube.  The angle is altered by approximately 5 degrees in just the last pass.  However, if the angle on the last pass is only 1 or 2 degrees, it would be beneficial to just remove the angle completely, and make it flat.

A flat oval design is most often used in the last pass and only in certain cases.  It is successful with Tig and Laser welding and with two-roll weld boxes of any weld type.

A peaked fin pass design is used when there are no side roll passes between them, as occurs on large pipe mills. In years past, the old design, low-frequency welders liked a peak tube to ensure good electrode contact, but that is not really needed. When Tig welding, the last fin pass is commonly finless, allowing the strip edges to be as closed as possible before the welder.

  • fin_designs.png
  • fin_designs_2.png

98.6%

On-Time Delivery

98%

First Time Performance

Still Searching For Answers?

Roll over to our Worlds Leading Resource Center

Search our Resources

No One Else Does What We Do

Roll form tooling tested at our facility or yours

Illustration of three linked gears small medium and large. Learn More

Detailed setup package & technician's testing remarks

Illustration of a piece of paper with lines on it to indicate writing. Learn More

Tooling drawing fully detailed

Illustration of a pencil. Learn More

Technicians available to troubleshoot at your facility

Illustration of a technician bust wearing a hat with with a wrench below the technician. Learn More

Tooling shipped in foam-filled wooden crates

Illustration of a box with all 4 top flaps open. Learn More

If it's not right, we'll make it right. Guaranteed.

Time to Roll Profits!

Have a technical question?

Need a quote from one of our performance specialists?

Simply contact us here or call and get answers 24/7.

Contact Us (888) 953-9400

Roll-Kraft hosts regional Tube and Pipe Mill seminar in Waverly, Nebraska

After a long dry spell of over two years due to the pandemic, Roll-Kraft hosted its first regional seminar of the 2022 season in Waverly, Nebraska on May 3rd.

➤ Read More

Roll-Kraft Tube and Pipe Live Training Seminar on May 3

Join us on May 3rd, 2022 for our live Tube & Pipe training seminar.

➤ Read More

In Memory: Bret Molnar (1959-2021)

It is with very heavy hearts that we announce the passing of our beloved lifelong teammate, Bret Molnar.

➤ Read More