Recent content by AndyVictor

Hi, Code (ASME IX) mentions that welders shall be qualified by mechanical testing. It also says welders may be qualified by RT. My doubt is who decides which one to follow? Regards AndyVictor

How can PWHT be conducted on a tube to tubesheet weld? Both new construction and also repair welds. Material is P No.4. Tube sheet thicness 90mm, tube size 8000mm lg. x 20mm od x 2mm thk. I am worried about distortion to the bundle, if the whole bundle is heat treated. For repair, How can we...

I also have a question related to bend test. Where does AWS specify whether longitudinal or transverse bend test is required. Thanks Andy

Sorry to post this after long gap. Actually my doubt is on comment by Vesselfab(Sept 2011) that "don't forget that your weld consumables must be certified for -20F" Is the requirement to be certified(Can be done by consumable manufacturer) or classified (expected to be classified by...

For normal requirements your view is valid. But as per Sec IX, if impact testing is required, heat input (a supplimentary esssetial variable) becomes essential and will be required to be controlled. That means any variation from the qualified value(range) will require requalification. Regards

Answering to Annu739's original question, As an operations person, best way to get familiarised is to have some interaction with your plant inspection engineers on live problems in static equipment/piping and follow the leads you get from them by referring to the relevant code/standard. Reading...

Hi!! I want to weld a non pressure part (thickness 10mm) to an impact tested vessel of thickness 60mm (P1G2)in service having originally undergone PWHT. Can I weld it without PWHT. What sort of procedure qualification will be required for this. Regards

I think the drain hole mentioned on the tubesheet is not in lieu of the drain nozzle. Drain nozzle can be provided a bit above the tube sheet. The drain hole is for draining the remaining liquid.

Thank you, Weldtek. It clarifies my doubt and gives me some lead to follow. Regards

Thank you for these postings. I am not a metallurgist. Can you provide some guidance as to the source for these information (Such as heat treatment procedure for various metals and its effect on the metal for each case!!)on heat treatment metallurgy for a non metallurgist. Regards

Thank you Kiwi, You are right. But I could not find any clear range of values for which each pqr is valid without need for requalification. eg. , Suppose current used in a procedure qualification is ~142A, how much more or less I can go for the WPS - Can i have 130A or 150A??. Hope my doubt is...

Sorry, I didn't get back on the grade earlier. I checked, it is 304L. Actually, the problem was for my friend, who is in petrochemical industry. The application is service water. Thanks

We find almost detailed (although, sometimes confusing) explanation on the range of base metal thickness, weld thickness etc qualified for a specific PQR. Is there any reference in Sec IX or else where, as to the exact range of values qualified with respect to Heat input and electric...

I am sorry . I just reproduced what one of my colleagues told his friend (a highly qualified -I think Masters in Engineering & Level III !!!) person) from the welding field who did not clear his CWI in his 1st attempt. He was , I think , pointing o the fact that more qualified we become , we try...

Max of 2T/2t is not universal. It can change depending on many factors. I believe the reinforcement thickness is not considered. For a groove weld, the weld thickness for a full penetration weld is the thickness of the base metal itself. I hope Some one can clarify further on this point. Regards