Re: [MW:21987] Lack of fusion in production welding - GMAW !!!

Dear Experts,

Thanks for your view.

 

Mr. Pradip,

I am using Sheilding medium - 80% Argon & 20% CO2

Welding position is 2FR and the fillet weld arrangement is shown in the attached file.

Welding is done on fully mechanised(automatic) machine.

I have done a Pipe to plate joint in which I have used only 16-18V and the pipe schedule is Sch.80-2"pipe.

 

Mr. Sayee,

As you said, I experienced the same in CS and SS material.

I didnt come across LOF in CS, whereas in SS it is so.

 

Experts,

Can you please tell me the basic difference an dhow to identify Short circuiting & spray transfer mode. How can I switch over.

Regards

Vadivel. M

On Wednesday, September 24, 2014 9:08:25 AM UTC+5:30, Sayee Raghunathan wrote:

Vadivel

Shielding gas and inductance are most important factors without disregarding all others that Goswami metioned in his email.

Note that due to sluggish nature of ss weld pool due to increased Ni and Cr contents in general implies lower weld pool fluidity and higher susceptibility for LOF than c-steel welding for example. Hence, check if these two (inductance and shielding gas with 2%o2 or Co2, more preferably a He gas mix giving hotter arc and correct weld bead profile) are correctly being applied before investigating other factors.

Regards

Sayee

On Tuesday, 23 September 2014, pgoswami <pgos...@quickclic.net> wrote:

Hi Vadivel,

 

What're the  welding parameters (including shielding gas) being used??. What's the welding position? Are the welders' qualified for all position welding?

 

There're many  subtle variables for GMAW, which play important roles between, procedure qualification and production welds.

 

Please read this attachment to understand the basic. GMAW-S could be often problematic, especially for positional welding and the shielding gases involved. GMAW-P could be a better option in many instances. Modern machines have features like STT or Miller -RMD, which offers much better control. It's worth looking at , if you have such machines at your works.

 

GMAW is an excellent process, but takes time to produce results, which temps the fabricators to switch to FCAW. However it's not worth giving up at all.

 

Thanks.

 

 

Pradip Goswami, P.Eng,IWE

Welding & Metallurgical Specialist

Ontario, Canada

pgoswami@quickclic.net

pradip.goswami@gmail.com

http://ca.linkedin.com/pub/pradip-goswami/5/985/299

 

---

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Vadivel Mahadevan
Sent: Monday, September 22, 2014 8:28 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:21970] Lack of fusion in production welding - GMAW !!!

Hello Mr. George,

My LOF is intermittent in majority of the jobs. However in fewer bodies it is continous. I can say 85:15 ratio of the Leaked welds

Regards

Vadivel. M

On Saturday, September 20, 2014 4:10:26 PM UTC+5:30, George Dilintas wrote:

Your LOF is intermittent of continuous?
Best regards
Dr Georgios Dilintas
Authorized Nuclear Inspector
Authorized Inspector Supervisor
HBS Regional Technical Manager

---

  From: Vadivel Mahadevan [vadivel...@gmail.com]
  Sent: 09/20/2014 02:19 AM MST
  To: material...@googlegroups.com
  Subject: [MW:21945] Lack of fusion in production welding - GMAW !!!

Dear Experts,

 

I face Lack of fusion problem in GMAW process in the production weld often.

WPS qualified on short circuiting mode as the torch is designed to the same.

But when I use the same current and voltage I come across Lack of fusion

The wire I use is ER316L of 1.2mm dia.Bare wire , volt not more than 19V.

 

Now I started using 23 to 26V(Spray transfer mode volt range) to overcome my issue.

Can you suggest what are the parameters I need to control to get a sound weld in the short circuiting mode.

 

Regards

Vadivel. M

07829007400

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