welding 300-series pipe without back purging

2020-6-7Huntingdon Fusion Techniques HFT innovators designers manufacturers and Worldwide specialists in weld purging products International Leaders and Pipe Purging Specialist in Weld Purge Technology Weld Purge Monitors Welding Accessories and Pipe Plugs and Stoppers 2014-4-27Most mixes will have some active component the reason for the mix and as stated most are costlier than argon Nitrogen is not a big issue for mild steel (though argon makes a smoother root) but can cause nitrogen embrittlement in Austinitic stainless steels like the 300 series I will use nitrogen on SS in two cases

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2020-6-28Weld Purging is the act of removing oxygen from the vicinity of a weld before during and after welding metals such as stainless steel titanium zirconium and nickel alloys Without Weld Purging the weld would be left oxidised and discoloured which could then lead to loss of corrosion resistance and metallurgical imperfections

Two common methods are used to back purge a pipe root-pass weld zone Purging the entire volume of a long pipe run is often suggested Tables have been published concerning purge times for various pipe diameters and lengths of pipe run (1) Local purging of the immediate volume around the weld zone is an alternative method of back purging and

2020-1-16THE WELDING OF STAINLESS STEELS 3 2 Stainless Steel Welding Processes 2 1 Electric Arc Processes 2 1 1 Processes with a Refractory Metal Electrode 2 1 1 1 Gas Tungsten Arc Welding: GTAW (*) The GTAW process also known as the TIG (Tungsten Inert Gas) or WIG (Wolfram Inert Gas) process is illustrated in the above fig-ure The energy necessary

2019-5-5in the 300 series • Tailored for root pass welding in stainless steel pipework • No backing gas required • No root underbead oxidation • Outstanding usability in all welding positions • Proven corrosion resistance Slag cover at the reverse side acts to prevent oxidation on the back side surface without the need for external purging

Figure 12 : Back bead of pipe back-bead welding by TGX wire Figure 13 : Back bead (left) and surface bead (right) In root pass welding of stainless steel pipes by TIG rod a back shield of pure Ar gas is usually required to prevent oxidation in the back bead which could render it unsound

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2020-1-1On a large firewater system for an offshore platform orbital welding was able to reduce welding time to one half that of manual welding and cut reject rate from 15% to 5% The joint design tolerances must be tightly controlled and are crucial for successful orbital welding The recommended joint design for most pipe sizes is a J-groove with a

Figure 12 : Back bead of pipe back-bead welding by TGX wire Figure 13 : Back bead (left) and surface bead (right) In root pass welding of stainless steel pipes by TIG rod a back shield of pure Ar gas is usually required to prevent oxidation in the back bead which could render it unsound

2019-5-5in the 300 series • Tailored for root pass welding in stainless steel pipework • No backing gas required • No root underbead oxidation • Outstanding usability in all welding positions • Proven corrosion resistance Slag cover at the reverse side acts to prevent oxidation on the back side surface without the need for external purging

2020-8-19For over 45 years Huntingdon Fusion Techniques HFT has been recognised as an International Welding and Weld Purging Leader designer and manufacturer in Weld Purging Technology Welding Products Weld Purge Monitoring (oxygen monitoring) Tube and Pipe Weld Purging Systems and all other areas of Purge Welding (Back Purging) Engineered using our metallurgy experience

2020-1-1On a large firewater system for an offshore platform orbital welding was able to reduce welding time to one half that of manual welding and cut reject rate from 15% to 5% The joint design tolerances must be tightly controlled and are crucial for successful orbital welding The recommended joint design for most pipe sizes is a J-groove with a

2020-6-7Huntingdon Fusion Techniques HFT innovators designers manufacturers and Worldwide specialists in weld purging products International Leaders and Pipe Purging Specialist in Weld Purge Technology Weld Purge Monitors Welding Accessories and Pipe Plugs and Stoppers

10 Purging techniques purging rate effect of pipe length two series of tests involving TIG orbital welding of stainless steel pipes that differ in terms of wall thickness and material in Table 1 (without any claim to completeness) Purging i e covering the weld root and adjacent parent material

2020-6-17Tube and Pipe Weld Purging Experts HFT COB established more than 40 years ago are acknowledged as an international leader in the field of Weld Purging Products Weld Purging Weld Purge Monitoring (oxygen monitoring) Tube and Pipe Weld Purging Systems and all other areas of Purge Welding (Back Purging)

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SS is extreamly suseptable to air contamination so you need to protect the back side of the weld or it will become contaminated there are other matereals that also need backpurging but SS is the most likely one you will incounter if you are MIG welding it you may need to back purge depending on the thickness its need is most evedent in thin matereal so its mostly used with TIG with strait

2020-7-27For over 40 years Huntingdon Fusion Techniques HFT has been recognised as an International Welding and Weld Purging Leader designer and manufacturer in Weld Purging Technology Welding Products Weld Purge Monitoring (oxygen monitoring) Tube and Pipe Weld Purging Systems and all other areas of Purge Welding (Back Purging) Engineered using our metallurgy experience

2020-6-17Tube and Pipe Weld Purging Experts HFT COB established more than 40 years ago are acknowledged as an international leader in the field of Weld Purging Products Weld Purging Weld Purge Monitoring (oxygen monitoring) Tube and Pipe Weld Purging Systems and all other areas of Purge Welding (Back Purging)

2020-6-14For over 40 years Huntingdon Fusion Techniques HFT has been recognised as an International Welding and Weld Purging Leader designer and manufacturer in Weld Purging Technology Welding Products Weld Purge Monitoring (oxygen monitoring) Tube and Pipe Weld Purging Systems and all other areas of Purge Welding (Back Purging)

Welding 300-series pipe without back purging Inflatable pipe stoppers simplify pipe blocking for purging What welding inspectors should know about welding codes and standards Get The Tube Pipe Journal updates in your inbox Sign up and be the first to know about

2008-3-1The techniques for welding carbon steel pipe are the same as those described here for welding stainless however to qualify procedures for welding 300 series stainless steel pipe without backing gas fabricators must do the following: 1 Ensure a minimum 1/8-in gap around the entire circumference of the joint

When you are welding stainless steel pipe for the food service industrial or automotive industries back purging is done to prevent the formation of oxides inside of the pipe which are caused by the presence of oxygen In weld speak this is know

2008-7-5We're purging for the CrMo 5% and 9% as in addition to ASME B31 3 and ASME IX our Client requires us to follow API 582 Welding Guidelines for the Chemical Oil and Gas Industries In API 582 Clause 7 3 states that back purging is required for welding materials having a nominal chromium content greater than 2 25%