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Re: [MW:25623] GMAW for CS

By Materials & Welding
Reasons for pores could be plenty. It could be  due to

1. in adequate shielding - increase shielding gas flow rate to 12 to 15 lpm depends upon transfer mode.
2. Excessive shielding gas flow rate -  reduce gas flow rate if it is 25 lpm and above as it creating vacuum   
3. There could be leaks in between - Check with soap water solution. Tighten the clips properly.
4. Thee could be drought due to high velocity breeze while welding in open.
5. It could be also due to a higher stick out for amp / volt selection. 
    Average 15 &  max. 25 mm., depending up on transfer mode 
6. Argon with 18 /20 CO2 will be good for CS. Pure Argon may induce undercuts.

Sridhar.

From: George Dilintas <dilintas@gmail.com>
To: Meghanadh K <materials-welding@googlegroups.com>
Sent: Friday, 7 October 2016 1:35 PM
Subject: Re: [MW:25503] GMAW for CS

arc stability issue

2016-10-04 13:01 GMT+03:00 Kannayeram Gnanapandithan <kgpandithan@gmail.com>:
Do not use Pure Argon, Mix with Oxidising gas like O2 or CO2

THANKS & BEST REGARDS,
KG.PANDITHAN, IWE,  AWS-CWI, CSWIP 3.1,
CONSULTANT-WELDING & QUALITY
Mobile no: +919940739349

On Mon, Oct 3, 2016 at 2:15 PM, 'MAGHROUD Moussa' via Materials & Welding <materials-welding@ googlegroups.com> wrote:
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Dear experts

I am trying to qualify a PQR using GMAW applied on a plate spec A36,10 mm thick, ER 70S6 1.2 mm, position 3G, progression downhill and Argon pure as shielding gas. But after RT shooting we find porosity throughout the joint. 
Please anyone can help how to qualify this weld. 


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Dr. Georgios Dilintas,
Dipl. Ing. In Aeronautic and Space Engineering
Ph.D in Mechanics of Solids - Computational Mechanics
A.I.S, A.N.I, IRCA Lead Auditor
Welding, Stress Analysis, Corrosion, QA/QC, Failure Analysis, Risk Analysis
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