Zero colour oxide free welds for manual welders

01W WeldTrailingShields

Titanium, stainless steel and other corrosion resistant materials need to be shielded with an inert gas while welding takes place, in order to protect the molten weld pool from combining with oxygen and nitrogen from the surrounding air.

Without this protection, welds will oxidise and can form metallurgical defects that may cause weld joint failure.

TIG (GTAW) and Plasma (PAW) welding torches are fitted with gas cups, through which inert gas flows and protects the molten weld metal around the arc, however as the weld torch travels further along the weld seam, the welded metal is still hot enough to oxidise as it is exposed to air. In most cases the oxidation has to be removed to reduce the risk of weld failure.

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Tig (GTAW) welders need certainty with their welding equipment

13W MultiStrikesTungstenElectrodesOne key to a good Tig weld is the electrode.

At this time, welders are going through a period of uncertainty as far as the information and circumstances arising with respect to their electrodes.

Until now, the best scientifically confirmed electrode was made with Tungsten, with a small addition of a material called thorium oxide, also known as thoria.

Since the 1970’s when the UK Health and Safety authority of the time (HSE) issued warnings about the radioactive effects of long term exposure to Thoria, welders have been uncertain about their standard red tipped tungstens which contain 2% of that material.

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Faster pipe purging with QuickPurge®

02W QuickPurgePipeWeldPurgeSystemWhen stainless steel, duplex steels or titanium pipes need to be welded in the process industries, they generally have to be purged of air and water vapour, in order to obtain the quality of weld demanded by such industries.

Even today, more than 40 years after high quality pipe weld systems were developed, welders are still carving crude discs out of sponge foam without understanding the characteristics of such materials.

Now a days low cost, high quality products are available that save them countless volumes of time and money.

Most sponge foam products are open cell materials, which allow gas to pass through, so as fast as the inert purge gas is pushing the air out of one end of a pipe, oxygen and water vapour is entering at the other end.

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Handy Oxygen Measuring Instruments for Welders

02W PurgEye100 IP65 WeldPurgeMonitorWelders need to measure oxygen near the weld when they are joining metals like titanium, stainless, chrome and duplex steels.

A fast and reliable way to do this, is to use a hand held monitor near the joint to ‘sniff’ samples of the gas and to check the amount of oxygen present.

Ordinary oxygen monitors are not suitable for use in this application, because they are calibrated to be accurate at atmospheric pressure for health and safety purposes.

So special oxygen monitors are available that are calibrated to be accurate at 100 ppm of oxygen, which is a suitable value to guide those welding stainless steel and 10 ppm which is an excellent value for the welding of titanium.

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New Tungsten Electrode Grinder

05W Tungsten Grinder TEG1000 TEG3Ensuring your Tungsten Electrode is sharpened correctly can help to improve weld quality. Tungsten Electrode Grinders are a convenient, safer and more accurate way than other methods of grinding Tungsten Electrodes.

Back by popular demand, Huntingdon Fusion Techniques HFT® have re-initiated the manufacturing of the TEG-2 Tungsten Electrode Grinder, which was retired from their product range a number of years ago.

It has an updated design with a number of improvements and the model name is now the TEG-1000.

Georgia Gascoyne, CEO said: “Since we stopped manufacturing the TEG-2 Tungsten Electrode Grinder, we’ve had many requests to bring it back into our product range. We are excited to announce that it’s back, with a new modern look and attractive price.”

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Flexible Welding Enclosures® for Additive Manufacturing

24W FlexibleWeldingEnclosuresWhen welding titanium and any other reactive metal for additive manufacturing, it is important that the welding zone is purged of oxygen and nitrogen to a level as low as 10 parts per million (ppm) of O2 or less.

After more than 40 years of experience in the field of manufacturing Flexible Welding Enclosures®, Huntingdon Fusion Techniques, HFT® have broadened their range from the standard circular enclosures, to include purpose designed and manufactured models to encompass volumes of 30 m3 and greater to meet the needs of research and production entities internationally.

The ultraviolet stabilised, transparent, low vapour pressure polymer used for these enclosures, is tough and not easily damaged, but for those cases where damage may occur, a repair kit is included with all enclosures as they are shipped, with extra kits assembled and shipped on a next day delivery process if ever required. 

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Power Piping Perfectly Purged

15W HotPurgePreHeatedPipeworkPurgeSystemsSpecial new high temperature materials allow production problems to be solved. Thanks to the high temperature resistance of glass coated cloth, it is now possible to manufacture Weld Purging Systems to resist temperatures up to 760ºC.

This is particularly valuable for welding pipework suitable for power stations and other utilities that produce high pressure steam for the rotation of turbines to produce electricity for the national grid.

Usually the materials specified for such pipework are chrome steels that need to be heated up to 300ºC prior to and during welding and 760ºC for heat treating/annealing (for stress relief purposes) afterwards.

For a number of technical reasons, the inside of the welds made to join the pipework have to be covered in an inert gas to prevent oxidation and metallurgical defects. In order to provide the conditions for welding the joints described, a weld purging system is generally used to isolate a small volume either side of the weld, to create optimum conditions. 

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Low Cost 1 PPM Weld Purge Monitor®

purgeye, nano, weld purging, oxygen reader, ppm traceFor many years, oxygen monitors and gas analysers have been used for weld purging. These instruments have been designed and calibrated for accuracy at atmospheric oxygen level, but not for weld purging where accuracy is required when reading much lower oxygen levels.

With their scientific background, Huntingdon Fusion Techniques HFT® have designed and manufactured the PurgEye® 300 Nano, the World’s first and only low cost, no frills, Weld Purge Monitor® that measures accurately down to 10 parts per million (ppm) on a large alpha numeric display.

Ron Sewell, Chairman for HFT® said: “The PurgEye® 300 Nano has been developed for weld purging where data logging, alarms and welder control are not necessarily required. It is small, lightweight and inexpensive. There are no knobs, no switches, no controls, making this a really simple, ‘plug and play’ monitor.” 

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Double Freezing technique for large diameter Valve replacement

pipe freezing, tube freezing, valve changing, cob industriesReplacing valves in a pipeline can be a challenge, especially when the pipelines have liquids running through them. One option is to completely drain the system to make the repairs, which can prove costly with respect to loss of expensive fluid, heating or cooling costs, security matters, time that system is down plus labour costs.

Pipe Freezing Experts Huntingdon Fusion Techniques HFT® recently introduced the Qwik-Freezer™ Systems to their Pipestoppers® Division. These systems create ice plugs or freeze seals in the pipes, avoiding the requirement to drain systems.

Qwik-Freezer™ is the industry standard portable CO2 Pipe Freezing System, in use around the World, covering pipe diameters from 3/8” – 8” (9 – 200 mm).

The quick and easy to use system requires very little set-up time and is the only CO2 Pipe Freezing System capable of freezing larger pipe diameters.

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Ron Sewell talk Fabtech and all things Weld Purging

Weld purging, welding chamber, flexible enclosure, fabtech, huntingdon fusionHuntingdon Fusion Techniques HFT®’s Chairman Ron Sewell talks all things Fabtech and Weld Purging on episode 7 of Arc Junkies’ Podcast.

Listen to the Podcast in full

In November, HFT® will be exhibiting at Fabtech, along with our USA Partner, COB Industries. This year we will be featuring our remodelled Tungsten Electrode Grinder, along with our Special Flexible Welding Enclosures®.

We'll be on Booth No. B37049

We will have more information coming soon, so don't forget to get the dates pencilled in your diary ... 6th - 9th November, McCormick Place, Chicago, USA.

Inflatable Stoppers for Petrochemical Applications

pipe plugging, tube plugging, pipe stopping, overnight stopper, debris stoppingBlocking pipes or other orifices to carry out routine maintenance and other applications can prove challenging where hydrocarbons are present in liquid and gas form.

Now, a range of hydrocarbon resistant Inflatable Pipestoppers is available for the Petrochemical and Oil and Gas Industries. Manufactured in cylindrical and spherical formats from 1 – 96” (25 – 2,440 mm) in diameter with a high-grade latex, rubber internal inflatable bag covered with a petrochemical resistant layer, which has a tough, woven impregnated nylon outer cover for use up to 90ºC (194ºF).

The versatile Inflatable Stoppers are used to service a wide variety of industrial applications. As “overnight stoppers” they provide a strong barrier in pipeline activities, to prevent foreign bodies entering the line during downtime.

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Highest Quality Welds made with Lower Costs

purgeye, weld purge monitor, oxygen analyzer, gas reader, ppm traceWelding stainless steel, titanium, zirconium, niobium and other metals sensitive to atmospheric gases, requires oxygen levels to be as low as 10 ppm and in some cases, knowledge of dew point level in the shielding and purging gas.

Many welds of this nature are still welded with archaic or home-made items to try to shield the weld, but most fail to give satisfactory protection resulting in oxidised joints, which can lead to metallurgical failure at worst and the necessity for additional processes such as mechanical or acid removal of the oxide film.

The extra processes of cleaning/oxidation removal can be so easily negated by using professionally designed and manufactured products and a Weld Purge Monitor®. One such monitor, which measures oxygen level down to 1 ppm is the PurgEye® 300 Plus, now with PurgeNet™!

This lightweight, portable gas analyzer indicates actual oxygen levels down to 1 ppm (accurate to 10 ppm) on a large alpha-numeric OLED display, perfect for achieving oxide-free, zero colour welds time and time again.

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