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Hi, may I ask those of you who have knowledge and where one can buy welding balloon for small bore GTAW welding down to 1/2 "stainless pipe ID. We can get them in Norway but not less than designed for 2" tube only. Kjell Gr°nvold

Hi, Question 1.If a weld qualifcation is conducted with welding process 136 (FCAW) is it allowed to prepare out a WPS with welding process 138? Question 2. A PQR of a fillet weld is made with HI 1,0 kJ/mm and hardness testing is completed as pr ASME IX, is it allowed to specify higher HI than...

hi again all, sayee1 (Materials)states: "I would rather qualify a par with all high heat input parameters as high as a welder can weld and one with as low heat as low as possible for all passes. I would then test the high HI PQR for toughness and the low heat input PQR for hardness" yes I'm...

hi all in the loop, yes, I can understand that all of you wonder about why 53 passes are needed in this plate connection where the wt is only 45mm but done is done. Please find copy of WPS and PQR sheet where the valuse are listed for your info attached. I will request them to calculate an...

hi the minimum heat input value is 0,57 kJ/mm (measured of only one pass of 53 passes) and max was 1,55 (measured of only one pass of 53 passes) let me underline that this PQR welding is carried out by one of our subcontracor and I'm disagree in this way to establish the final welding range on...

We have performed a PQR of a 45mm plate in S355 material and weld position 3G. Welding method is FCAW. The number of single welding layer is 50 pcs achieved during the PQR welding. Please may someone state which of the calculation methods are most appropriate when observed heat input values to...

hi,recommend you to change the shielding gas to 99.25%Ar + 0.75 Nitrogen (mixgas) which simultaneously stabilizes nitrogen loss during welding (GTAW) this shielding gas can be supplied by all recognized suppliers of welding gas. The main impurities is water H2O and water concentration shall be...

hi Welding of super duplex grades should be made without Co2. Use pure argon or 99,25Ar+0,75N as well as well controll of gas flow and it's turbulens Kjell Gr°nvold

hi Welding of super duplex grades should be made without Co2. Use pure argon or 99,25Ar+0,75N as well as well controll of gas flow and it's turbulens Kjell Gr°nvold

david339933 Thanks a lot for your advice br kjell Kjell Gr°nvold

Hi Have any of you heard about if it is defined in any codes or standards whether it is possible to use two WPQR's to support a WPS for small bore tube welding in super duplex provided that all essential parameters in both WPQR's are equal but that each of WPQR's have different wall thicknesses...

hi sixxerxxe, we are doing orbital tig welding on super duplex tubing using of 24mm shielding gas nozzles to secure optimal protection from the atmosphere. I'm agree, this is not an essential parameter but by poor gas coverage you will risk oxidation of the weld which in turn weakens the quality...

hi weldstan, appreciate your response we have not taken any final decision at its discretion whether to switch from super duplex (UNS 32750) to API 5 X65 quality but trying to be slightly ahead if it is possible to TIG weld X 65 quality without subsequent annealing (PWHT) when this additional...

hi again, These images are misinterpreted because the circular spot placed as a burned on layer outside austent / ferrite structure is probably something deposit after the initial polishing and etching was performed. So from my point of view it seems to be a drop of transfer that is stuck on an...

hi, by using a calibrated XRD analysis device you will very quickly reveal right type of material this is assuming that it is properly grinded down to clean surface where you will perform the measurement (the top surface must be 100% free of foreign matters) Kjell Grønvold

hi, I'm seeing only a normal structure formation consisting of austenite/ferrite in a normal distrubution (spacing) with no traces of neither sigma nor chi phases on this image, but where are the other ones?? Kjell Grønvold

hi, In order to do a proper XRD analysis you are required to remove all corroded and foreign particles onto the surface prior to XRD check, if not you will get totally wrong chemical analysis record Kjell Grønvold

hi, we have done a lot of RT images with this type of internal oxidation caused by lack of backing gas and please find one example attached belowhttp://files.engineering.com/getfile.aspx?folder=8cfd3941-70d1-4f65-9489-5d3661012218&file=916AR1.tif

hi, Conversion tables are not always correct. Be aware that Vickers HV measurements are most suitable for testing of macro/microsamples for welding qualification purposes and a fixed Vickers HT machine will generate far more precise measurements than these portable instruments having a lot of...

Hi, I work as a welding engineer in Aker Solutions Norway Umbilical Dep. and wonder if anyone has experience in GTAW welding of pipes in API 5L X65 material without subsequent local heat treatment (PWHT). The actual dimension is OD 150mm and wall thikness 8mm and looking for good and feasible...