The tube and pipe fabrication technology area covers sawing (band, circular, and friction) and other cutting processes, such as abrasive, flame, laser, oxyfuel, plasma, and waterjet. It also discusses forming processes, including bending and end forming. Finally, it includes a handful of miscellaneous processes, such as trimming, beveling, finning, grooving, threading, and spinning.
June 13, 2006
The mechanical aspects of rotary draw tube bending haven't changed since modern tooling was developed 50 years ago. Likewise, the role of the tooling (mandrel, pressure die, bend die, and wiper die) hasn't changed. However, tube fabricators these days have many choices in regard to the tooling, especially wiper dies. Choices include material, rake angle, and whether the wiper die's feathered edge is fully machined or honed by hand.
May 9, 2006
Fabricating and repairing pipe in the oil-rich tar sands of Alberta, Canada, is an enormous, ongoing project that requires specialized equipment to meet a variety of challenges. John Page is a consultant in Canada who has been working on several of these projects and has learned what's needed to get the jobs done.
April 11, 2006
Editor's note: This is the second part of a two-part article that examines tube bending defects, possible causes, and suggested remedies. Part I discusses surface defects; Part II covers other defects, such as wall thinning, ovality, buckling, and fractures. When the stress on the...
April 11, 2006
Have you ever started with what you thought was a good tube, ended with a bad bend, and wondered where you took a wrong turn? Correcting for defects requires some detective work, and an understanding of the bending process. This article examines tube defects and offers fixes.
March 7, 2006
Innovations and new developments in rotary tube and pipe cutting, such as high-speed cutting, minimal heat generation, special holding collets, and automatic loading, trim and sorting have reduced or eliminated time required for secondary operation, improved efficiency, and reduced costs.
March 7, 2006
Although capillary action basically is the magic behind ensuring proper filler metal distribution into a joint, six basic steps also are necessary to make sure that the design and engineering of the joint helps lead to a good brazed joint.
February 7, 2006
BCI Burke, Fond du Lac, Wis., is the oldest playground and park and recreation equipment manufacturer in the country. As the company grew and its product offerings and colors multiplied, it found it needed to address problems with long leadtimes. Burke looked at every possibility for improvement, including processes improvements, inventory organization, manufacturing equipment purchases, and personnel productivity improvements, including crosstraining.
January 10, 2006
Tube cut-off machines have evolved to integrate end forming and bending capabilities that normally are considered secondary operations. The suitability of a cutting method to be integrated inline with end forming and bending depends on each cutting method’s characteristics and the bending and end forming requirements.
December 13, 2005
Today's architects develop designs and concepts that push past the boundaries of yesterday. Fabricators are faced with a sometimes daunting challenge to make unusual components to assist architects in completing unusual buildings, to the extent that they sometimes have to rely on themselves to develop new equipment and processes.
November 8, 2005
Wiper dies are a fundamental requirement in modern tube bending applications in which tubes are bent at increasingly tight bend radii with increasingly thinner wall thicknesses. The design of the wiper die plays a key role in its performance and durability, as does its manufacturing method and the material from which it has been constructed.
October 12, 2005
The welding process and ambient temperature affect the structure and mechanical properties of welded joints in large-diameter (1,420 mm) pipes of manganese low-alloy steels, which are used commonly in oil and gas pipelines. Pulsed welding can improve the homogeneity of the structure and reduce the grain size of metal of the weld and HAZ zones. The ambient temperature causes structural changes, which affect the ductility and impact toughness in the welded joint zones. Temperature plays a role. Research shows that welding at 20 degrees C leads to an increase in ductility and impact toughness of 8 percent to 27 percent, and welding at -60 degrees C leads to an increase of 15 percent to 24 percent.
September 13, 2005
Evidence that stainless steel has potential as a material for automotive components—for its high strength-to-weight ratio for overall weight reduction, good dent performance, corrosion resistance, and formability—was presented by ISSF members at the SAE International™ 2004 SAE World Congress, in Detroit.
September 13, 2005
One way to avoid dimpling and deburring while making holes in tube and pipe is use annular cutters. Because annular cutters are hollow, there is no dead-zone resistance to overcome. Knowing how to use an annular cutter and what to watch for can help avoid problems and extend tool wear.