Making hands-free straight, saddle, and miter cutsRovanco Piping Systems Inc. designs and fabricates piping systems for applications such as water (hot and cold), steam, and jet fuel. It sells fabricated pipe—typically with straight or miter end cuts—up to 36 inches in diameter. It provides preinsulated, high-temperature, low-temperature, and containment systems.
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Predicting the service life of galvanized steelZinc, which has been used to hot-dip-galvanize steel for 250 years, provides 50 to 75 years of corrosion protection in many environments. Empirical data collected about hot-dip galvanized (HDG) steel field performance from 1940 to 1980—in environments ranging from industrial to marine to suburban—indicates that zinc can prevent base steel corrosion more than other surface treatments. Because of zinc's long-lasting protection, projects require no maintenance and therefore no maintenance costs.
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What's that material?: Using XRF technology to identify alloysMany alloys—stainless steels, HASTELLOY®, INCONEL®, INCOLOY®, MONEL®, duplex and superduplex alloys—are similar in appearance and easily mixed up after mill test reports (MTRs) and heat stamps are removed in material processing. These mix-ups can have serious consequences to the end user, including product rework, factory downtime, or premature product failure. A single mistake may cost hundreds of thousands of dollars in materials and labor to correct. In addition, any loss of consumer confidence resulting from shipping incorrect material carries incalculable costs.
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Phases, structures, and the influences of temperatureWhen you heat or cool a piece of metal to a specific temperature, that metal goes through what's called a phase change, in which its crystal structure changes. Sometimes the change is obvious. For example, when a piece of metal melts, it goes through a phase change when the crystal structure breaks down and the metal goes from solid to liquid. When it solidifies it's also a phase change, as the structure re-forms from liquid to solid.
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Six dangerous misconceptions about crane safety: Knowing the facts could save your lifeKnowing how cranes should be used, and how they should not be used, is critical to crane safety. Overload, side pull, limit switches, secondary braking devices, using the reverse direction for speed control, and daily inspections are surrounded by myth and mystery in the workplace.
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Tooling tricks of the trade: A few tips for extending die life |
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Die width selection |
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The Bold in Arches: Pipe fabricator uses induction bending to create roof truss assembliesThe phraseobstructed viewis probably most connected with older sports stadiums. For example, at Wrigley Field in Chicago, depending on where your seat is, watching Sammy Sosa in action in right field might be replaced by a view of a rusting steel girder.
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Is your bend good enough?: Standards for hot and cold bendingBending 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.
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Skelp edge preparation for manufacturing ERW pipePreparing the edge of a metal strip properly before it enters an electric resistance welding tube mill makes a huge difference in the quality of the final product. Make sure your prep methods match your quality requirements.
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Reviving the past: Welding students restore ironwork to Victorian-era YMCA building |
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Riding on the cusp of something great: When Colorado artist's career hits plateaus, he climbs themKevin Robb's sculptures seem to defy gravity, arrest time, encroach space. Each sculpture is a moment freeze-framed; each element seems to be impossibly suspended.
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Don't be a hot dog with heating heads: Tips for safe useSome call them rosebuds, others call them multiflame heating heads, and a few call them heat sticks. No matter what you call torch attachments, this article is a frank discussion about these tools that use oxygen and a fuel gas to make a lot of heat quickly. When used properly, they can make quick work of many heating jobs.
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Understanding weld discontinuities |
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Making your own punch and diesHow many times have you looked through huge piles of blueprints for a prototype part or short-run job and thought, "If only I had that tool, this job would be a piece of cake?"
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Hot spots for U.S. metal fabricated exportsIncreased global competition for customers on their home turf has driven U.S. metal fabricators to throw their nets wider to international markets. With this in mind, fabricators should look at the lists of the countries purchasing the most U.S. metal fabricated tools, machinery, products, and partially assembled goods as a road map to export opportunities.
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