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February 2009 |
905-827-4171 |
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Welding of High Strength Steel Landing Gear Components.
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By Jeff Pritchard, CEO - Vac Aero International Inc.
The assembly is a five-piece, tubular structure manufactured entirely from 4330V steel. It consists of a hollow tube approximately 1500mm long by 120mm in diameter, two fittings (upper and lower) that are TIG welded to each end of the tube and two backing rings that bridge the gaps between the fittings and the tube during the welding operation. For many years, VAC AERO has been performing welding and heat treating operations on a landing gear component for a popular turboprop aircraft. Because of the part design, the welding operation in particular is complex and challenging and often involves substantial re-work. In order to minimize the rate of re-work. READ MORE
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How to Move Molecules in Vacuum Systems/Part 1: Mech. & Booster Pumps
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By Daniel Herring.
In order to create a vacuum within a closed container, or vessel, we need to remove the molecules of air and other gases that reside inside by means of a pump. The vacuum vessel and pumps (mechanical, booster, diffusion, holding) together with the associated piping manifolds valves, gages and traps comprise a typical vacuum system. To reach the various vacuum levels, different vacuum pumping systems are required. The foundation of any of these systems is the positive displacement mechanical, or roughing, pump. The roughing pump – so called because it is used to produce a “rough” vacuum – is used in the initial pumpdown from atmospheric pressure to around 2 x 10-2 torr. READ MORE
Published with the permission of Industrial Heating Magazine
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How to Move Molecules in Vac. Systems/Part 2: Diff. Pumps & Troubleshooting
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By Daniel Herring.
Vacuum pumps have been called the heart of a vacuum system. Let’s look at how we can reach low vacuum levels using diffusion pumps. And we need to know how all pumps should be maintained to keep the vacuum system running trouble free. The diffusion pump is a type of vapor pump, and it is used to help achieve even lower system pressures. The diffusion pump is capable of pumping gas with full efficiency at inlet pressures not exceeding 2x10-2 and discharge (or foreline) pressures not exceeding 5x10-1 torr. The diffusion pump cannot operate independently. It requires a separate pump to reduce the chamber pressure to or below the diffusion pump’s maximum intake pressure. READ MORE
Published with the permission of Industrial Heating Magazine
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