 June 2006FEATURES Controlling Heat Treatment of Welded P91 Modified 9Cr-1Mo, commonly referred to as P91, is widely used in the power industry because of its superior proper- ties at elevated temperatures. P91 get its favorable strength and toughness properties from its microstruc- ture. The desired microstructure can only be obtained using material with a well-balanced chemical analysis and proper heat treatment. Heat treatment is an especially critical step during the manufacturing and fabrication of P91. P. de Smet and H. van Wortel Plasma Arc Cutting Offers Savings to Concrete Bedrock Stone, Inc., is a highvolume concrete recycling facility that sends out anywhere from 200 to 400 truckloads of finished products per day. The company, located in the bustling Turnpike Corridor section of Kearny, N.J., is one of the busiest Class B concrete recycling facilities in the region. The company recycles hundreds of incoming truckloads of brick, concrete, block, asphalt, and dirt, which is used in road bases, foundations, and construction sites. S. Hidden Dry Hyperbaric Welding of Subsear Pipelines The expansion of the oil fields in the North Seaw has been a driving force behind development of remotely contolled hyperbaric GTA welding of subsea pipelines. O. M. Akselsen et al. Orbital GTAW Boosts Production of Leak-Free Tubing Leaks have long been considered to beinherent to industrial hydraulic systems, but recent safety and environmental concerns have made it imperative to explore alternative joining technologies that could produce leak-free assemblies. In 2001, Iracroft Ltd., a specialist in the manufacture of rigid tube assemblies for highpressure pneumatic and hydraulic applications, received a request from a major customer for a regular supply of tube assemblies. B. K. Henon Laser Cutting Helps Create New Defense Machinery As enemy attack technology advances, becoming more effective and lethal, U.S. defense systems need to be constantly ready to react. General Dynamics Land Systems (GDLS) is at the forefront in the effort to protect the lives of U.S. troops overseas. As a leading government contractor, Land Systems operates the United States’ only main battle tank production facility in Lima, Ohio, as well as satellite plants across the country. It also plays an integral role in the U.S. Army’s core product development and modernization plans. Titanium Emerges as New Seawater Piping for Navy Vessels Grit blasting, or the roughening of the substrate to be thermal sprayed, is as important as the spraying itself. It cleans the surface and roughens the substrate to form an anchor tooth pattern to improve the coating adhesion. The measurement and control of the surface roughness pattern need to be better monitored and controlled for thermal spray coatings. This article is based on my experience working for a manufacturer of grit blast equipment. It looks at what is common practice, current writings, and recommended procedures to improve this practice. E. R. Sampson Joining Pipe with the Hybrid Laser-GMAW Process: Weld Test Results and Cost Analysis Grit blasting, or the roughening of the substrate to be thermal sprayed, is as important as the spraying itself. It cleans the surface and roughens the substrate to form an anchor tooth pattern to improve the coating adhesion. The measurement and control of the surface roughness pattern need to be better monitored and controlled for thermal spray coatings. This article is based on my experience working for a manufacturer of grit blast equipment. It looks at what is common practice, current writings, and recommended procedures to improve this practice. E. R. Sampson WELDING RESEARCH SUPPLEMENT Mechanical Behaviors of resistance Spot Welds during Pry-Checking Test (.pdf) The effects of material type, part thickness, wedge prying angle, pitch distance, and weld button size on checking sensitivity were investigated. C. L. Tsai et al.
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