Roll-Kraft’s Welded Tube & Pipe Solutions Forum, Vol. 1

PUBLISHED: 07 Dec 10

Roll-Kraft has been providing solutions to tube and pipe producers around the world for years and now wants to share the answers with you. Tube and pipe producers submit their questions through the Dr. Resolve feature on the Roll-Kraft website, You can also follow us on the Social Media outlets, Facebook and Twitter, as well as in our monthly newsletter.

What’s the Problem?

What could be causing marking of tube in the fin section of the mill and weld box?

Probable Cause and Solutions:

There could be multiple causes for this problem. Some of the more frequent issues are:

  • Strip width too wide
  • Driven roll settings adjusted too tight
  • Driven rolls not parallel
  • Driven stands loose - check integrity
  • Driven rolls not set at metal line
  • Drive RPM not coordinated with breakdown and sizing RPM
  • Fin blade worn beyond tolerance
  • Side rolls setting adjusted too wide
  • Side rolls boxes loose - check integrity
  • Side rolls not set to metal line
  • Side rolls not centered with driven rolls
  • Side rolls not parallel
  • Check tube size between each driven and side
  • Analyze design for improper forming
  • Weld roll settings adjusted too tight
  • Rolls worn beyond tolerance

Roll-Kraft has its headquarters in Mentor, Ohio, and maintains offices in Frankfurt, Illinois (Roll-Kraft Northern) and Woodbridge, Ontario, Canada (Roll-Kraft Ltd.). The headquarters facility can be reached by phone at (440) 205-3100, or fax at (440) 205-3110. More information about Roll-Kraft products and services is available on the website,

Roll-Kraft, USA
Tel: + 1 440 205 3100

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