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.
January 10, 2005
Editor's Note: This is the first installment of a three-part series on welding zirconium. Part I addresses metallurgy, weld preparation, and shielding techniques. Part II, which will appear in the October/November issue, will cover welding technique. Part III, which will appear in the December issue, will discuss additional methods of joining refractory metals.
November 9, 2004
Tube fabricators use a variety of methods—sawing, lathe cutting, rotary cutting, supported shear cutting, dual-blade shear cutting, and laser cutting—to cut tubing from mill lengths into shorter pieces for use in final fabrication. No single method is optimal for cutting the broad range of tubular materials and tubular shapes produced by this industry.
October 12, 2004
Editor's Note: This is the first installment of a three-part series on welding zirconium. Part I addresses metallurgy, weld preparation, and shielding techniques. Part II covers welding technique. Part III discusses additional methods of joining refractory metals.
September 14, 2004
Ron Stange looks back on his 50 years in the tube-bending industry and provides his insight on the one thing tube bender operators must know to be successful: Ironclad rules for successful bending do not exist. Tube bender operators must start with guidelines and incorporate their own experience to be successful.
August 10, 2004
The increasing use of advanced equipment and applications (such as orbital welding for high-purity systems) requires better weld preparation. A thorough understanding of equipment, tool bits, and materials—including advanced alloys—helps to achieve better end prep.
July 13, 2004
Bending tube or pipe so the finished product conforms to one of two bending standards can help to reduce rejects and improve relations between fabricators and their customers. The standards can facilitate the use of bending terms, and promote an understanding of bending tolerances and acceptable defects before starting a bending project.
March 11, 2004
Orbital welding first was developed in the late 1960s by a group of engineers from McDonnell Douglas to join aerospace tubes. These engineers were aware of the problems associated with producing repeatable welds for their critical applications.
March 11, 2004
Welding technology has changed dramatically over the last few decades. Although skilled welders always will be needed in manufacturing, mechanical welding devices can provide improvements over manual welding in terms of repeatability and throughput.
February 12, 2004
Weld inspection, weld logging, and weld recordkeeping always have been a part of quality assurance (QA) procedures for certain industries, particularly aerospace, nuclear power, semiconductor, and pharmaceutical.
January 29, 2004
Your company's first robot may cause more trouble than expected. This doesn't mean that the robot will not work, but it is a piece of
January 13, 2004
Central Washington University in Ellensburg, Wash., is known for its strong science programs. "Flying Bridge," a structure designed by artist and sculptor Ed Carpenter, physically and metaphorically spans the biology and chemistry departments in the university's new Dean Science Building. Carpenter, who designed the bridge with engineering consultation from Peterson Structural Engineers Inc., teamed up with Albina Pipe Bending Co. Inc. to tackle the project's material bending and fabrication requirements.
January 13, 2004
You can achieve nearly trouble-free bending by being aware of the causes of typical compression bending problems and by correctly operating and maintaining the compression bender. Most compression bending problems are one of three types:Flattening or collapsing on the outside of the bend.Crimping...
December 11, 2003
Early power supplies for contact and induction welding for tube production, which were introduced in the 1950s, operated at 300 to 400 kHz. Modern power supplied, introduced in the 1990s, are variable from 200 to 400 kHz. While using any frequency in this range can produce acceptable welds for most applications, finite element analysis can be helpful for finding the optimal frequency for a particular gauge and material.