FCAW Weaving Width

[Ram Chatt]

Dear Friends,

 

What is max.Allowable FCAW Welding Weaving Width .Any Standard Mention ?

[Tarek Yehia]

As far as i know, there is no limitations except ASME sec. VIII Div.1 & Div.2 (para. UCS-56 & 6.4.5.2) respectively and this is only for SMAW welding in case of repair areas as well only.

On Tue, Jun 18, 2013 at 4:19 PM, Ram Chatt <cha...@gmail.com> wrote:

Dear Friends,

 

What is max.Allowable FCAW Welding Weaving Width .Any Standard Mention ?

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Best regards,
 
Tarek Yehia

[Dindo]

It would be all dependent on your WPS, the wider the width the less is your travel speed the higher the heat input. This would be specially be important on impact tested jobs.

[kannayeram gnanapandithan]

general Engineering practice not more than 16 mm

[c sridhar]

There is no thumb rule for fixing  the weld width with GMAW  (or) FCAW  processes. it could be up to
15 to 20 times diameter of  the filler wire size being used by you.

Make sure that you do not get any under cuts at the toes of the weld. If required, you can also adjust
torch and travel angles to avoid such problems.

In auto welding also, the oscilloscope could be adjusted  up to 20 times the wire size being used to get 
proper weld width, but maintain the dwell time on either side to avoid under-cuts in all the areas.

Sridhar.

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[Ram Chatt]

Thank you Friend,

 

 

in my problem we are welded so many joints for FCAW welding weaving width for single layer 20-25 mm (using multi 2 layer welding totaly caping width 45-48 mm ).But our client said this is not allowable .they make NCR.

 

[c sridhar]

When your client says 20 mm  is not acceptable, then pl. find out what is their acceptable norms.

Calculate the total width of cap run and use 3 layers in place of  2 layer deposit.

This will help to increase the travel speed (due to reduced width of each layer) and also avoid NCRs.

Sridhar.

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From: Ram Chatt <cha...@gmail.com>
To: material...@googlegroups.com
Cc: c sridhar <sridh...@yahoo.com>
Sent: Monday, 24 June 2013 8:34 AM
Subject: Re: [MW:18007] FCAW Weaving Width

Thank you Friend,

 

 

in my problem we are welded so many joints for FCAW welding weaving width for single layer 20-25 mm (using multi 2 layer welding totaly caping width 45-48 mm ).But our client said this is not allowable .they make NCR.

 

[Tarek Yehia]

Dear friend,

Tell him his NCR is unacceptable or he shall furnish his reference.

Any NCR shall be refereing to project specs, code, standard or applicable procedure violations. He can't simply raise NCR!!!

If he provided, then please update us.

On 24 Jun 2013 07:11, "Ram Chatt" <cha...@gmail.com> wrote:

Thank you Friend,

 

 

in my problem we are welded so many joints for FCAW welding weaving width for single layer 20-25 mm (using multi 2 layer welding totaly caping width 45-48 mm ).But our client said this is not allowable .they make NCR.

 

[Pieper QSI]

Of course it depends on specification(s) you have to follow during your project. But in general if your welding procedure is qualified by using string beads or with weaving in a specified width you should use this technology also for project welds especially when Charpy impact requirements need to be met. Increasing the width will increase the Heat Input (slow down the travel speed) as well and can reduce your CV impact values drastically.

In that case only heat input determines the acceptable weaving width which in case of AWS D1.1 never may become more than the Heat Input used during welding procedure qualification (see variable 9 - table 4.6 of AWS D1.1).

If nothing is specified in general 10 – 12 times the wire diameter is used as an acceptable range for maximum weaving width. In case of Ø 1.2 mm wire this means that max. allowed weaving width will be 12 – 15 mm.

 

Met vriendelijke groeten / Best Regards,

 

Herman Pieper

QA-QC Inspector / IWI-C Welding Inspector / IWT / Materials Expert

 

Job van der Havestraat 6

8384 DB, Wilhelminaoord

Cell: +31 6 51691215

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[Pradeep kumar hormis]

     Exactly. Mr Sridhar is correct.  In Aramco according to their standards it is there about width of SMAW, GTAW( 3 to 5 times of diameter) processes . But if the Client specification or standards is not mentioned anything about Width , you can use  best industry practice. You had been used already Multipass caping. It is acceptable. If there is requirement of  hardness test, you can assure the hardness(mechanical properties) value to proove your client about the acceptance of your caping ( main intention of multi pass caping).

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Thanks & Regards

PRADEEPKUMAR HORMIS
QC WELDING INSPECTOR
ARAMCO PROJECT(JEDDAH REFINERY)
Mob:+966 - 59 11 36 36 9