The tube and pipe production technology area encompasses mills and all of the equipment that makes a mill run successfully: tooling, welding units, nondestructive testers, bundlers, scarfing equipment, straighteners, scrap choppers, and washing systems.
December 13, 2005
With the right equipment and proper setup, tube mills can produce dimple-free round tubing efficiently. A multistep process using a two shear blade makes a dimple-free cut, and an inline brush end finisher can be used to remove the ever-present clearance burrs, if needed
December 13, 2005
An overview of the pressures faced by the tube and pipe producing industry in 2005 and the author's views on how 2006 will be similar, but with a greater emphasis on energy costs, conservation, and availability. Ends with a few reminders about tube mill maintenance and efficiency.
October 11, 2005
Weld bead scarfing (cutting, removing, and disposing) exposes mill operators to numerous hazards, including cuts and burns from the scarf. Part I of this article discusses the reasons scarf is removed from tube and the mill parameters that affect the scarf removal process. Part II discusses a variety of manual and automated removal and disposal methods. Part III discusses strategies for improving ID weld bead removal and disposal.
September 13, 2005
When properly selected and utilized, single-cut die sets can produce top-quality cut ends on square and rectangular tubing. This article discusses the criteria for selecting and using the die sets to achieve the best results.
April 11, 2005
Figure 1Tube Mill Cutoff - Left to Right - Single CutA comprehensive tooling plan that includes setting up and maintaining sufficient tools according to the original design manufacturer's (ODM) specifications is critical for efficient high-speed tube mill operation. The tube mill cutoff component...
April 11, 2005
On a tube or pipe mill, the incoming strip is formed by about 24 pairs of tool stands. To help ensure such a line runs smoothly, the strip must be pulled between every pair of stands. The parameter that indicates if or how much the strip is pulled is tension.Traditionally, tension is controlled by...
March 8, 2005
Controlling the wall thickness during the manufacture of seamless steel tubes and cast-iron pipe is critical in meeting specifications and minimizing scrap. Ultrasonic measurements typically are performed on tube or pipe at room temperature, many hours after forming is complete. At this...
July 13, 2004
Various methods are used for welding pipe, including electric shielded metal arc welding (SMAW), submerged arc welding (SAW), and flash end welding.Another efficient process is magnetically impelled arc butt (MIAB) welding. Current technology and equipment allow MIAB welding of pipes with wall...
June 8, 2004
It is accepted that, because tube production is a highly competitive industry, many tube producers stay up nights thinking of ways to increase output and improve quality with less labor. Three obvious strategies are to increase mill speed, minimize downtime, and eliminate secondary operations...
May 4, 2004
Read Part I Editor's Note: This article, Part II of a two-part series on tube and pipe threading, explores troubleshooting related to threading cutting, insert shape, chip breaker geometry, coatings, and coolants. An examination of the cutting tools used on the finishing floor to...
May 4, 2004
Stainless steels are inherently resistant to surface attack in mildly corrosive environments. However, when corrosion does occur, it can result in the formation of pits on the surface or within crevices of the part. Why does this situation develop, and what can be done to prevent catastrophic failure?
January 29, 2004
Editor's Note: This article is adapted from a presentation made at the TPJ Symposium, March 16-18, 2003, Scottsdale, Ariz.The U.S. Congress and the states have created a complex scheme of environmental rules and regulations with which tube and pipe producers must comply. Failure to do so...
December 11, 2003
Do you remember going to the county fair and watching candy makers make taffy? As a child I often would watch the whirling motion of the taffy pull machine as it whipped and pulled and whipped and pulled again and again until the candy was the right consistency, texture, and color. As long as the...