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For AC-GTAW of Aluminum Alloys,... most of the significant advances focus on new ways to manipulate the AC wave form. These advances largely result from using inverter-based power sources, which allow a welder to extend the balance control, adjusting output frequency and independently controlling current in each AC halt cycle. New inverter-based GTAW machines extend EN balance control, allowing duration from 50 to 90 percent. Making the EN portion of the cycle last longer:* Allows greater weld penetration* May permit increasing travel speeds by as much as 20 percent.* Narrows the weld bead* May permit using a smaller-diameter tungsten electrode to more precisely direct the heat or deposit a narrower weld bead
Pump it up"Centrifugal pumps have become more robust, with much tighter tolerances and stress analyses of components to increase efficiency and machine time to failure," according to Bruce Smith, North American sales manager for Fristam Pumps Inc., Middleton, Wis. Shaft deflection that results in moving parts hitting stationary components in the pump is a major contributor to pump failure, and manufacturers are addressing that concern.Liquid ring pumps are coming into play in the industry as an alternative to standard centrifugal pumps, adds Smith. Although these scavenger pumps have been around for a quarter of a century, pharmaceutical manufacturers have embraced the technology and forced redesigns that have expanded their applications. Liquid ring pumps are particularly adept at handling fluids with entrained air, an issue with cream, which tends to foam during transit. Liquid ring pumps do a superior job in fully evacuating a tank, a material-savings advantage that appeals to ice cream manufacturers and liquid egg processors, according to Smith. Pump improvements have been accelerated with the application of computational fluid dynamics (CFD) software, points out Russell Jones, business development manager-pumps for Alfa Laval in Pleasant Prairie, Wis. "From an R&D point of view, CFD is a big advance in optimizing design and increasing pump efficiency," he says. The technology has been instrumental in boosting pump efficiencies from the 40 percent range to 60 to 70 percent in recent years.
Natural gas heaters for sale right here. Our discount natural gas heaters can be pruchased online and delivered to you today. Buy a natural gas heater online and save tons.
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