Re: [MW:29138] RE: 28982] Backing gas as per API RP 582

There is enough arc force which could potentially displace the atmospheric gases in the root for SMAW process prior to solidification. Though adding purging is good but not warranted. 

Regards

Babu 

On Thu, Feb 21, 2019, 11:04 AM Anil Kumar <bathulaanilkumar@gmail.com wrote:

I Feel Even in Root , if Welding is done with SMAW, Back purging is required, in Covered electrodes slag is formed in the outer surface , it will not protect inside, Since SS is highly volatile and readily absorb atmosphoric gases, back purging is required

Thanks & Regards,

Bathula Anil Kumar

PH N0: +91-7675019922

On Tue, Jan 29, 2019 at 3:27 PM George Dilintas <dilintas@gmail.com> wrote:

Slag is lighter than molten steel. It will come up to the surface. I wonder thait will protect the root. Usually we do 5mm with purging and gas backing using GTAW and then we switch to SMAW 

Στις Δευ, 28 Ιαν 2019, 07:53 ο χρήστης PGoswami <pgoswami@quickclic.net> έγραψε:

Manoj,

 

SMAW never requires back purging. It's the "slag" generated by the process, which protects the weld root. This is just back to basic scenario.

Thanks.

 

P.Goswami.P.Eng, IWE.

Independent Welding & Metallurgical Specialist

Saudi Aramco: Designated Project Welding Engineer(DPWR)& Quality Management Personnel

Linkedin: https://www.linkedin.com/in/pradip-goswami-2999855/

Email:pgoswami@quickclic.net,pradip.goswami@gmail.com

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Manoj John
Sent: January 27, 2019 8:04 PM
To: materials-welding@googlegroups.com
Subject: [MW:28982] Backing gas as per API RP 582

 

Dear Experts,

 

As per clause 7.3 of API RP 582 Ed. 2016 back purging required for GTAW & GMAW process but no where I could found for other process like SMAW.  Is it mean that if we do welding with SMAW process back purging is not required?

 

Please share your interpretation.

 

Thanks and regards

 

Manoj.

 

 

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