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
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 fusionThe 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.RegardsVadivel. M07829007400
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