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.
August 1, 2009
While bending round tube and pipe involves many variables and challenges, the difficulties in bending nonround shapes are more numerous and complicated. Among the most common shapes are square, rectangular, and oval (elliptical and flat-sided). None react to the bending force in the same way that round shapes do, so understanding how the material reacts is the first step in learning about bending nonrounds.
June 29, 2009
Measuring the bends and straight sections of a bent tube can be tricky and time-consuming, especially if the tube has a large number of bends in several directions. Photogrammetry, also known as optical measurement, uses a booth equipped with several digital cameras to make a digital image of the part, allowing fast, easy measurements.
June 3, 2009
Two technologies improve the quality and decrease the cost of fabricating high-purity systems, such as those used in the food and beverage, dairy, pharmaceutical, and semiconductor industries. These two techniques are mechanically formed T connections and orbital welding. A common question is this: Can orbital welding be used on mechanically formed T connections? The answer is yes, but fabricators need to understand the limitations and restrictions of this combination.
May 28, 2009
Competition is tough and getting tougher. A critical strategy for staying in business is automation. Putting together a flexible, automated system with quick-change capability can help tube fabricators manufacture a variety of parts, both for existing projects and future programs. A few key pieces of equipment and a long-term view of current and future projects can help to justify the expense.
April 1, 2009
Bending tube or pipe successfully is a matter of managing a handful of processes and variables and controlling the flow of the metal. The same principles apply to bending profiles, or rolled steel sections (RSS). However, because profiles aren't closed, they are more prone to distortion than tube or pipe. A close look at an RSS bending job provides a step-by-step approach for tackling this sort of project.
April 1, 2009
Although the energy market has seen ups and downs, overall the trend is a growth path. A manufacturer of welded structural and mechanical tube and pipe can get into this market by using its existing mill to manufacture oil country tubular goods (such as line pipe and casing) and adding a finishing floor to its operations. Understanding API requirements is the first step in planning a finishing floor layout.
March 9, 2009
Electricity demand grew an average of 15,000 megawatts per year from 1995 to 2006, and this trend will undoubtedly continue. The Energy Information Administration predicts that meeting future demands will require the equivalent of more than 20 new 500-MW power plants per year over the next 20 years or so. A critical component in power plant construction is titanium tubing, which is favored for its high strength and corrosion resistance.
February 10, 2009
Ranch Hand Truck Accessories was established in the area in 1986 to produce truck grille guards, a product that still comprises a majority of the company's sales. A 25 percent increase in production of its grille guards and front bumper replacements led to the need for a faster, more efficient, and more protective way of packaging its products.
January 1, 2009
Continuous improvement and statistical process control are useful,time-tested techniques—they have been used since the 1950s—buttheir use must be tailored to specific applications. For example, atypical manufacturing metric is parts per minute, but many rollformers should measure feet per minute. This and other tips can helproll formers accurately evaluate their productivity and measure theimpact of process improvements.
December 2, 2008
Many seamless tube producers in North America use cross-roll piercing mills built in the 1950s that were based on designs from the1930s. While it would be advantageous to replace such aged equipment, that isn't always necessary. A minor equipment upgrade can do wonders. Improving the bar steadiers—the devices that hold the mandrel the steady as the pipe exits the mill—can greatly improve the mill's output and reduce the pipe's wall thickness variation.