Materials & Welding

Many times I have seen that even some of out best engineers still argue about this issue... In root side of a single-side weld, the slag in SMAW or FCAW only protects the weld and not areas adjacent to weld (i.e. HAZ and heat tint area in Stainless steels). Slag does not protect Root HAZ and heat tint area in Stainless steels;  Welding is not only about the "weld metal",  A welding engineer must consider HAZ as a part of the weldment...  This is as basic as it gets, whether you are dealing with SMAW or any other process. Heat tint area consists of a layer between 50-300 microns (depending on temperature) which is a result of Chromium depletion of the underlying surface. Sometimes this Cr-depletion is so severe that the the Chromium content drops below minimum level and respectively, the corrosion resistance of these layers under heat-tint film drops way below minimum requirements. It will create corrosion initiation sites which is the most critical and time consuming stage i...

SA 351 covers only ASS, Duplex and others in SA352.  On Thu, 28 Feb 2019 8:49 am muneebslsa@gmail.com , < muneebslsa@gmail.com > wrote: No, i mean that low temp covers only in SA-352 right? i am in doubt that your CF8M is incompatible for your specific requirement. Thanks. Regards, MOHAMED MUNEEB MAHABOOB From:   chiluka venkatramulu Date:  2019-02-27 21:40 To:   materials-welding Subject:  Re: Re: [MW:29165] Impact test for SA-351 CF8M Not covered On Wed, 27 Feb 2019, 6:12 pm muneebslsa@gmail.com , < muneebslsa@gmail.com > wrote: Is that not a coverage from SA-352? Regards, MOHAMED MUNEEB MAHABOOB   From:   Kannayeram Gnanapandithan Date:  2019-02-27 12:52 To:   materials-welding Subject:  Re: [MW:29160] Impact test for SA-351 CF8M lateral expansion THANKS & BEST REGARDS, KG.PANDITHAN, BE, IWE,  CSWIP 3.1, ISO 9712 Level 2 in VT, ASNT-Level II in PT,MT,RT & UT, LA ISO 9001-2015, International Welding Engineer.  CONSULTANT-WELDING & QUALITY Mobile ...

Monoj,   Please see the extract from API-RP-582, which states clearly that purging is a must for GTAW &GMAW process when Cr-in the steel exceeds 2.25%. SMAW welds NEVER require any purging. Purging usually is the practice for open root welds, where the root requires protection from oxidation , when Chromium is above that specified amount. SMAW welds never require purging as the slag acts to protect the root . That's the very basics of SMAW welding process , where slag metal reaction  and separation is the key.   For fillet welds of thicknesses specified below "Heat Tinting "  is a possibility. Use of purging gas could  help to avoid oxidation and heat tinting for the thickness(2-5mm) as  mentioned here. However note use of small diameter (2.4mm) could be useful to avoid heat tinting if the thickness of the component being welded is around 5mm.   Minor heat tints are removable by acid pickling. Depending on the corrosivity of the process media, many clients does insi...

Copper slag On Thu, 28 Feb 2019 8:06 am prashant patil, < prashant92patil@gmail.com > wrote: Dear Team We want to achieve blast cleaning according to SIS 05 5900 Standards, SA Grade 2+1/2,  So which type of sand we can use Regards  Prashant Patil QA/QC Engineer 9561172405 -- 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 . Visit this group at https://groups.google.com/group/materials-welding . For more options, visit https://groups.google.com/d/optout . -- 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 unsub...

No, i mean that low temp covers only in SA-352 right? i am in doubt that your CF8M is incompatible for your specific requirement. Thanks. Regards, MOHAMED MUNEEB MAHABOOB From:   chiluka venkatramulu Date:  2019-02-27 21:40 To:   materials-welding Subject:  Re: Re: [MW:29165] Impact test for SA-351 CF8M Not covered On Wed, 27 Feb 2019, 6:12 pm muneebslsa@gmail.com , < muneebslsa@gmail.com > wrote: Is that not a coverage from SA-352? Regards, MOHAMED MUNEEB MAHABOOB   From:   Kannayeram Gnanapandithan Date:  2019-02-27 12:52 To:   materials-welding Subject:  Re: [MW:29160] Impact test for SA-351 CF8M lateral expansion THANKS & BEST REGARDS, KG.PANDITHAN, BE, IWE,  CSWIP 3.1, ISO 9712 Level 2 in VT, ASNT-Level II in PT,MT,RT & UT, LA ISO 9001-2015, International Welding Engineer.  CONSULTANT-WELDING & QUALITY Mobile no: +919940739349 On Wed, Feb 27, 2019 at 11:52 AM chiluka venkatramulu < ram...

Dear All: Below you can find a screen shot from SLV Duisburg publication: "Guidelines on the Welded Fabrication of Stainless Steels" SLV publications are among the most reliable references in welding engineering  and here, it clearly states that in single side welding of SS, the other side must either be protected  or the oxide layer be removed. Regards Ramin  Kondori Sr. QA/QC & Welding Engineer ----------------------------------------------------------- PG-Dip. in Welding Engineering   (I WE  AT  0070 ) BSc. in Civil Engineering (IUT) BGAS  Painting Inspector ASNT Level I&II                          On Wed, Feb 27, 2019 at 4:12 PM muneebslsa@gmail.com < muneebslsa@gmail.com > wrote: You can check the attchments, but anyhow when it comes to thinner membrane regardless of whatever the consequences might be the case for oxidation which is non occurrence when we simply imagine for fillet welds but anyhow socket welds aren't with this case of lap to lap ...

Not covered On Wed, 27 Feb 2019, 6:12 pm muneebslsa@gmail.com , < muneebslsa@gmail.com > wrote: Is that not a coverage from SA-352? Regards, MOHAMED MUNEEB MAHABOOB   From:   Kannayeram Gnanapandithan Date:  2019-02-27 12:52 To:   materials-welding Subject:  Re: [MW:29160] Impact test for SA-351 CF8M lateral expansion THANKS & BEST REGARDS, KG.PANDITHAN, BE, IWE,  CSWIP 3.1, ISO 9712 Level 2 in VT, ASNT-Level II in PT,MT,RT & UT, LA ISO 9001-2015, International Welding Engineer.  CONSULTANT-WELDING & QUALITY Mobile no: +919940739349 On Wed, Feb 27, 2019 at 11:52 AM chiluka venkatramulu < ramuluchiluka@gmail.com > wrote: Dear All,, We have impact test requirement at -196Deg C for SA351 CF8M.  In this case, shall we need to required both energy observed and lateral expansion?. Please advise. Regards, Venkatramulu CH -- https://materials-welding.blogspot.com/ https://www.linkedin.com/groups/122787 --- You received this message because you are su...