Lack of fusion in production welding - GMAW !!!

[Vadivel Mahadevan]

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

[pkkani...@gmail.com]

Please check on travelling speed.

[george....@gr.bureauveritas.com]

try FCAW, is much less prone to lack of fusion than GMAW

best regards

Dr. Georgios Dilintas

Authorized Nuclear Inspector
Authorized Inspector Supervisor


I&F REGIONAL TECHNICAL MANAGER
BUREAU VERITAS HELLAS

Tel: +30 210 40 63 113/4
Fax: +30 210 40 63 118
Cell: +30 69 44 64 62 04
(See attached file: Dilintas_George.vcf)

pkkanishk2006---09/12/2014 10:44:57---Please check on travelling speed. On Saturday, September 20, 2014 2:49:34 PM UTC+5:30, Vadivel Mahad

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[Luis Opazo Zenteno]

Dear experts.

For pipeline construction, diameter 20 ", thickness 12.7mm and 20,62mm, as API 5L X70 steel" PSL2 "(attached image). We had considered making welding procedures (mechanical tests) SMAW process standard API 1104 with E8010- G.

Inspection (audit) requires us to accomplish with E9010-G, according to inspection (audit) E8010-G does not correspond to API 5L X70 "PSL2".

Please give me your opinion on this technique to determine further action.

Thanks and regards.

Luis Opazo Z.

(56-9) 983 370 40.

[K M JIJILAL]

Dear Zenteno,

As per API 5L, PSL 2 class pipes' minimum tensile strength requirement is 82000 psi .It may be reason for advice by the audit team for E-9010 electrode ,which can deposit weld metal having min. tensile strength of 90000 psi ( above the tensile of pipe)

Jijilal K.M.

Welding engineer

Albanna Engineering LLC

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[Alan Denney]

Not understood. PSL 2 is a quality requirement for linepipe.  The choice of welding consumable does not have to correspond with PSL 2. What the consumables have to correspond to are the strength requirements, the toughness requirements and the corrosion test requirements appropriate to the application as defined in the project specification (and that may not have toughness or corrosion requirements – which are entirely application dependent). I can understand a restriction on the use of E**10 electrodes for many pipeline applications – but that is an entirely separate matter.

 

AKD

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[Anup N K E]

Dear Zenoto,

Please find out if you can use E 8010 G wherein the tensile strength specified in the MTC of electrode is more than 82 ksi which shall meet the requirements for API 5L X70 as per trailing mail.

In case yes, note to be incorporated in WPS that MTC of each lot of electrodes shall be verified for the minimum requirement of 82 ksi ( instead of 80 ksi).

Regards,

Anup

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[MADHUSOODHANAN NAIR .G]

Dear Luis Opazo Z

This for your information you pipe API 5L X70 PSL -02

1. For main line welding- Welding processes GMAW - ER80SG (AWS 5.28)
all passes.

2. For Tie-in welding - welding processes STTP(Semi auto ) + FCAW (Semi auto)

Consumable For Root pass - ER70SG (A 5.18) ,Other passes
E81T8G (A 5.29)
3. For Partial Repair – Welding processes FCAW (Semi auto)
Consumable- E81T8G (A 5.29)
4.For through repair - Welding processes SMAW + FCAW(Semi auto)
Consumable For Root –E 6010 (A5.1), For Hot Pass – E8010G (A5.5).
Other passes - E81T8G (A 5.29)

Regards
Madhusoodhanan Nair G (INDIA)