Materials & Welding

Dear Mr. Sankaran, Thanks for the reply and your understanding. rgds, Sridhar. On Mon, 4 May 2026 at 15:18, Ashishranjan - Domech Fabricators Pvt.Ltd. < planningdfplril@gmail.com > wrote: Yes, you can use multiple PQRs to support a single WPS under AWS as well  but it’s handled a bit differently than in ASME Section IX, and you need to be careful about how you justify it.    Regards, Ashish Ranjan +91 9555864374 Save a tree...Please consider your environmental responsibility. Before printing this e-mail message, ask yourself whether you really need a hardc opy. " Confidentiality Warning : This message and any attachments are intended only for the use of the intended recipient(s), are confidential and may be privileged. If you are not the intended recipient, you are hereby notified that any review, re-transmission, conversion to hard co...

What the Macro Suggests From the image: Fusion is occurring on the upper groove walls. Root area shows an unfused triangular gap / cold lap zone . Weld metal is flowing around the joint rather than penetrating fully to the root. This is typical when the arc cannot adequately reach the root face or root land. Likely Causes 1. Amperage Too Low for Root Pass 82 A for first pass on a restrained joint with 50 mm thick tubesheet may be too low, especially if heat is rapidly absorbed by the heavy SA-516 tubesheet. The tubesheet acts as a heat sink , pulling heat away from the root. 2. Groove Design / Root Land Too Heavy If the groove has: narrow included angle excessive land/root face insufficient tube projection or mismatch then penetration becomes difficult at lower amps. 3. Arc Position / Torch Angle If arc is focused too much on filler or upper bevel edges rather than root corner, fusion at the bottom will be poor. 4. Travel Speed Too F...

Dear Sirs,  As per my below mail history and your recommendation for low Amps to avoid high heat input,  After performing the new MOCKUPs for 15.85, & 19.05 OD SS304L tubes to CS SA-516-70N tubesheet of 50mm with GTAW ER309LMO 1.6 Dia only of 3 passes for 19.05 ID tube, 82 A for 1st pass, 95A for 2nd, 100A for 3rd pass. Only 2 passes given for 15.85 OD tube. We got incomplete penetration aa per the attached macro photo., almost for all the tube welds for both sized tube welds. Please see the groove design for your reference.  Also, please give me suggestions to make sound complete penetration on root pass and to avoid cracks too. Thanks and regards,  Saravanan Sornam,  Ansan city, S.Korea  On Thu, 16 Apr 2026, 2:51 pm 'Ahmed Osman' via Materials & Welding, < materials-welding@googlegroups.com > wrote: ...

Anyone here familiar with Torque Report? Do you have sample template or format? -- https://materials-welding.blogspot.com/ https://www.linkedin.com/groups/122787 --- You received this message because you are subscribed to the Google Groups "Materials & Welding" group. To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com . To view this discussion visit https://groups.google.com/d/msgid/materials-welding/56804463-f63d-47d5-b5ce-c4f1f124c7dcn%40googlegroups.com .

Dear Mr Sridhar, Thanks a lot for your valid reply with acceptable reasons, very nice explanation. good & appreciate your effort.    Regards, Sankaran.SP Welding & Metallurgy expert On Wednesday, 29 April 2026 at 08:53:02 pm IST, sridhar cn <sridharcn305@gmail.com> wrote:  Dear Mr. Sankaran, 1.   For SS 410 (martensitic stainless steel) , PWHT directly affects hardness, toughness, and risk of cracking.   Metallurgical ly SS 410 forms untempered       martensite after welding , so   PWHT is mandatory  in most cases . PWHT is required to temper martensite , reduce hardness, and relieve residual stresses. 2.   Applicable Standards / References:  ASME Section II / IX   – Material & Wel...