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The Right Atmosphere for Welding Titanium

Mar 12, 2014
Welding Staff
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  • WD0120HFT-1.jpg

    Argweld flexible enclosures

    Flexible purge enclosures are available in spherical and rectilinear forms up to 2 meters in size. The HTF Argweld® flexible enclosures have ultra violet-stabilized engineering polymers used throughout manufacturing. The vertical sides are made from translucent material and the top is constructed from optically clear sheet.

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    Argweld trailing shields

    The Argweld series also includes trailing shields for use with GTAW (TIG) or PAW (plasma) welding torches, to provide high levels of additional inert-gas shielding that supplements what is supplied by the torch. The welding torch is mounted on the leading end of the shield and inert gas is fed through one or more ports behind the fusion zone. A seal between the shield and the work is ensured by a flexible, pre-formed and easily replaceable silicone skirt. Turbulence inside the cavity is avoided by passing the gas through a mesh filter above the fusion zone.

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    PurgEye 100

    Oxygen-measuring devices are necessary for welding titanium alloys, to ensure that the oxygen content of the purge gas is very low. The PurgEye® series was introduced in 2012, and may be used for continuous measurement with free flow of the purge exhaust gas across the sensor. They also may be employed as sampling instruments. The PurgEye 100 is a hand held or tripod-mounted instrument to display from 20.9% to 100 ppm oxygen.

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    PurgEye 300

    PurgEye 300 reads down to 10 ppm with extreme accuracy, and is a zirconia cell instrument to display from 1,000 to 10 ppm. Mains driven, the instrument has integral switching software to control external devices like power supplies or alarms, and software to give QC print of results for each weld when connected to a PC.

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    PurgEye 300 Nano

    For simpler applications, where switching of external devices or data acquisition are not required, the PurgEye 300 Nano is the lowest-cost instrument available for reading very accurately down to 10ppm.

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    PurgEye 500

    PurgEye 500 has all of the features of the PurgEye 300, but incorporates an internal pump to extract gas samples from the enclosure at preset intervals, giving fast reaction times.

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    PurgEye 600

    The fully integrated PurgEye 600 incorporates large touchscreen controls. It also records all purge data for each weld and makes
it available for downloading via a USB port onto a memory stick, 
or by connecting directly to a PC for subsequent evaluation as a quality control document. The ‘600’ also has on/off switching capability for alarms or welding equipment in the event of rise in oxygen levels during welding outside pre-set limits, as well as an integral electronic sampling pump.

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    PurgEye 1000

    The PurgEye 1000 accurately measures oxygen content in an enclosed space by placing the gas sampling head next to the purge space and sending the results electronically to the monitor, which returns the reading instantly.

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Specialized auxiliary systems and control packages are available to address the difficulties of welding titanium and its alloys without the risk of damage from atmospheric oxygen contamination. A wide range of trailing shields has been introduced and these take full advantage of advances in engineering technology. Flexible purge enclosures are available in spherical and rectilinear forms up to 2 meters in size. Ensuring that the oxygen content of purge gas is low enough to permit welding without incurring defects or oxidation, the use of a weld purge monitor is essential.

Following here are a series of products offered by the Huntingdon Fusion Techniques Ltd., which designs and supplies weld purging devices and systems, a specialty supplier of weld purging.

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