Re: [MW:18902] RE: 18787] Re: using of second welder while welding SS material

Hello dears ,

Sorry for delay in my reply due to work at site .

Since this Welding method I have seen around 8 years before in Dubai company , i would like to share whatever i remember the steps followed. If found error, I apologize .

If other experts have more experience on this welding method, please do share with me.

1. Both welder can weld root pass simultaneously in 2G position in PQR and it can be applicable for low thickness material , like 8 , 10 mm.

2. Then one hot pass to be welded with high travel speed and also we can avoid distortion for low thick material.

3. Heat input will be around 1KJ/mm for GTAW  and impact test sure will be passed by means of measuring lateral expansion values.

4.Generally this TWIN GTAW process is applied only to avoid root pass gas purging requirement.

5. If any corrosion test requirement is there in your spec or client specified , then better use gas purging and weld with standard GTAW process with a single welder asusual .

6. If you want to continue until the completion of full joint with TWIN GTAW method then you can keep the distance 50 to 100 mm from one side to other side.

    It means , on one side you can start the welding from the edge and other side you can start the welding 50 to 100 mm away from the edge.

    After completion of the joint you can weld the area 50 to 100 mm gap, after proper grinding .

7. Whatever techniques used during PQR with TWIN GTAW, you have to brief all the instructions under the notes in PQR and the same to be followed during production welding and same to be mentioned in WPS also.

Try this method with a sample coupon, do R&D with few sample tests  before you apply and propose to client with a proper evidence.

Cheers,

Saravanan,

Korea

On Tue, Oct 1, 2013 at 1:20 PM, JIGNESH RANA <2010jigs@gmail.com> wrote:

Mr. Dharmadattu.B

 

Have you already qualified the procedure with such arrangment ? The way it is described, it would be really difficult to control the weld properties manually-  simultaneously with two welders welding from opposite sides at a time. It would be nice, if your experience would be shared.

 

regards,

jignesh rana.

On Mon, Sep 30, 2013 at 7:58 AM, mustaffi <mustaffi@dynac.com.my> wrote:

Dear Mr. Mohd,

 

If pleasure if you can share with us sample WPS as reference , really want to know in details method of works.

 

Regards

Mus

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of mohd
Sent: Saturday, 28 September, 2013 1:27 PM
To: materials-welding@googlegroups.com
Subject: [MW:18787] Re: using of second welder while welding SS material

 

Dear Dharmadattu,

 

Yeah you have to mentioned in WPS.Process Twin tig for Root/hotPasses and same simulation to be done in PQR/WQT.

 

Regards,

 

Mohd.

 

On Sunday, September 22, 2013 2:21:54 PM UTC+3, Dharma dattu wrote:

Dear Experts,

While welding of SS material we need to supply a backing gas, as an alternative a second welder is deployed from back side to support or to melt the weld metal uniformly. is this method to be included in WPS's or is this a general practice. 

 

Regards,

 

Dharmadattu.B

 

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