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Whitewater, KS, United States

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GMAW processes are of very great economic importance in mechanised and automated production. Despite the great technical advancements during the last years, the acceptance of the process suffers from high emissions, particularly from welding fumes. Welding fumes are airborne particles which mainly consist of metal oxides. Moreover, radiation and gases are emitted. The exposure of welders and operators to fumes and gases is currently reduced by extraction systems, extraction torches and breathing masks. Although the arc process is the source of emission, the process itself has not been developed specifically with regard to low fume formation rates until now. As basic research for future low-emission GMAW processes, investigations into the formation mechanisms of welding fumes were carried out in the EWM Award "Physics of Welding". Despite the variety of fume measurements in the past, the causal mechanisms are not fully understood yet. Only with the understanding of these mechanisms can effective strategies be derived to counteract the formation of emissions and to reduce the hazard potential of the process. In the first place, investigations were carried out into pulsed processes which are known to emit few welding fumes. The pulsed arc offers many adjustable process parameters in comparison to short arcs and spray arcs. Subsequently, experiments with conventional and modified (reduced-energy) short arcs as well as experiments with conventional and modified (forced) spray arcs were carried out in order to investigate the potential of modern variants for reducing welding fume emissions. The results show that the fume emissions of GMAW processes and therefore the hazard potential for welders and operators can be reduced significantly.

ARC Technology | Date: 2013-10-25

A personal welding enclosure has a rigid support frame and a tent-like enclosure defining an inner work chamber. The enclosure, which is supported by the rigid frame, is beneficially formed from impermeable, flame-proof and/or flame-resistant fabric having desired strength, durability and thermal insulation characteristics. A pneumatic automatic shut off control system monitors variables in and around the enclosure, alerts personnel to the existence of potentially unsafe conditions within the enclosure and automatically terminates welding and/or other hot-work when an unsafe condition is detected.

Agency: Department of Defense | Branch: Army | Program: SBIR | Phase: Phase II | Award Amount: 497.15K | Year: 2013

This proposal details the development of a variable pulsed power system and custom load that simulates the audio, visual, and tactile response of a variety of explosive devices. The system operates by tailoring the driver parameters, such as voltage and current discharge profile, through the stimulus generator at the operating point that best matches the signature of the explosive device. The device resets itself and can be operated multiple times to mimic various explosive devices and distances in a single training session. The system will not harm the either the trainee or the simulation facility and will leave no trace of its operation such as spent projectiles, paint or other debris.

Agency: Department of Defense | Branch: Missile Defense Agency | Program: SBIR | Phase: Phase I | Award Amount: 99.98K | Year: 2009

This proposal details the development of a new FCG design that facilitates customization to drive loads of various impedances. It addresses several of the performance limiting problems associated with small helical FCGs and potentially facilitates driving high output voltage, moderate current loads directly, without the need for a transformer.

ARC Technology | Date: 2015-09-18

Haptic feedback system that simulates a detonation or explosive event. The system includes a power supply, an energy storage circuit, a switching circuit, and a conductor operatively connected to said energy storage circuit through said switching circuit whereby said conductor causes a haptic event when said energy storage circuit is electrically connected to said conductor by operation of said switching circuit. The system creates real explosions, shock waves and pressure waves in a safe manner for use in a simulator.

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