Traditional methods such as on-site handmade plugs, Fig 1, have been employed using cardboard or plastic sheet coupled with adhesive tape to cover gaps. PPM Pipe Purge Equipment for welding is a win-win with most stainless steel and exotic pipe fabrication projects. This example is from a leading fabricator in the Far East. Purge systems have evolved rapidly during the last decade as advances in materials and control equipment have been incorporated. If HFT® Weld Purge Dams, the QuickPurge® Tube, Pipe and Pipeline Inflatable Weld Purge Systems are manufactured for pipe diameters from 6 – 96 Inch (150 to 2,440 mm). Additional hoses are provided for extra gas and for connection to a purge monitor when measurement and control of residual oxygen content is required. Items consist of: welder, saw, file, purge plugs, argon, and welding hood. A better weld is also achieved by controlling the environment inside of the pipe. This is yet another product that PPM offers, lowering production and fabrication cost while increasing quality. Single ended Purge dams are ideal for tight bends, T piece joints, dome end connections and so on, where a Tandem Weld Purge Bladder Inflatable System cannot be used. The things needed for a good purge weld is not that long of a list. Leak tightness is erratic, leading to oxidation. Inflatable purge bags are cost effective and easy to install in the bore of a pipe or tube, with one purge bag on each side of the weld zone. See our Full Range of Welders & Welding Equipment on site & Buy On-line Now for great discounts! www.huntingdonfusion.com. 5. We sell a single line of products – Purging Systems. The standard dams are heat resistant up to 90ºC, but high temperature versions such as this are available and these can be used up to 300ºC – particularly suitable when pre- and/or post-weld heating is required. All purging systems ship factory direct and are closely inspected prior to shipment. 4. http://foodprocessing.com.au May, 2010. They are rugged to meet repeated use on site. • Insertion and inflation are rapid and ensure a high-quality seal. PPM Pipe Purging Equipment is used in stainless steel and exotic pipe fabrication, saving the user time and gas, which also means saving money! Where necessary to minimize oxidation on the inside surface of the pipe, the back purging should be maintained during several subsequent layers of welding regardless of welding process used. Each system is designed to save you time and money when welding exotic metals. These Inflatable Weld Purge Dams provide an excellent grip in the pipe with an effective all-round seal. These have resulted in ready availability, easier and faster set-up procedures, better gas sealing, and provision of sophisticated software to facilitate data acquisition and analysis. Purge welding stainless steel for cleanability and corrosion resistance. The gas is then diverted automatically to purge the pipe. References A better weld is also achieved by controlling the environment inside of the pipe. July 2006. • Inert gas is controlled and turbulence eliminated. Purging using designs based on advanced technology offers dramatic reductions in weld defects, significant savings on welding time and elimination of post weld cleaning operations. Effective inert gas protection depends entirely on the ability to seal the pipe being welded on either side of the joint with materials that are impervious to gas and do not contain any components likely to discharge contaminants during the welding cycle. The volume of gas re­ quired is therefore considerable. Weld purging is the act of removing, from the vicinity of the joint, oxygen, water vapour and any other gases or vapours that might be harmful to a welding joint as it is being welded and immediately after welding.. When inert gas is admitted, priority is given to inflation to produce an operating seal. The Tube & Pipe Journal. This is yet another product that B&B offers, lowering production and fabrication cost while increasing quality. The materials used outgas during welding and cause weld contamination. Inflatable dams such as the wide range manufactured by Huntingdon Fusion Techniques HFT®1 offer significant advantages; Keep the purge gas flowing while you weld so that air can’t get back into the purge zone. A wide range of purge systems is now available to meet different applications, but recent developments in technology have led to major improvements of one in particular – the inflatable dam. info@bbpipetools.com, (c) 2020 B&B Pipe and Industrial Tools • Sales Representative Login • v2.0, SFE Credit Application for a Business Account. By creating this chamber, these purge dam systems allow the oxygen to be pushed out of the chamber and then filled with Argon in one step. Welding is … By creating this chamber, these purge dam systems allow the oxygen to be pushed out of the chamber and then filled with Argon in one step. Dam the purge gas and full speed ahead. Argweld® Weld Purge Monitor®. 2. All this simply by effectively protecting the rear and the topside weld beads from contamination, and especially oxidation, using inert gas coverage. This is yet another product that B&B offers, lowering production and fabrication cost while increasing quality. Once you have given the purge gas time to fill the chamber, you can start welding. These items will insure that the weld is clean, presentable, and will definitely pass the inspection. It took a long time for engineers to recognise that the use of inert gas purging during the welding of tubes and pipes could not only improve overall weld quality but could save both time and money. P Anderson, R Wiktorowicz. 3. Jennifer Simpson. Gas purging for stainless steel pipe welding. 1. Inert gas feed connections can be of poor quality and lead to turbulence. Our goal is to offer quality purging systems at friendly no haggle pricing, that ships fast from a well established manufacturer. • Most are available ex-stock. They are time-consuming to make and insert and carry a hidden time penalty. In India and elsewhere argon is commonly used as a purging gas. Localized purging greatly reduces argon purge gas usage, and significantly reduces purge time, resulting in better quality welds, and substantially lower welding … They are invariably single-use solutions. www.timewelder.com, www.twi.co.uk/content/kspa001.html 2011. HFT® Weld Purge Dams, the QuickPurge® Tube, Pipe and Pipeline Inflatable Weld Purge Systems are manufactured for pipe diameters from 6 – 96 Inch (150 to 2,440 mm). Purgedam.com is a proud distributor of pipe purging systems manufactured by B&B Pipe and Industrial Tools. Huntingdon Fusion Techniques HFT®, UK. In common use are wood and expanded polystyrene coupled with adhesives and tape. Once the weld is done, you can cut off the gas and remove the seals or dams on the pipe. Buy Gas Purging Tools , from Rapid Welding Supplies. Sequence of Operation. • They are designed for multiple uses. Although these may appear to be convenient and low cost they come with significant disadvantages: It comes as a surprise to find that even some major international pipeline and pipework fabricators persist in using makeshift and primitive pipe dams made from totally unsuitable materials.