Re: [MW:16547] API 6A- PQR qualification for weld overlay - Automatic PAW process

Dear Sir,

"VALVE INDUSRY EXPERTS /ENGINNERS/MANAGERS/VP-METALLURGIST :- PLS , SHARE YOUR EXPERIANCE FOR SORT OF DIFFICULTIES"

IT WOULD BE TRIBUTE TO PHILOSOPHER CREATED THIS GROUP.

Thank you very much for Guiding:-

1) QW-211 - Qualifications in plate also qualifies for pipe welding & vice versa...

Query :- ASME not mentioned Special Case(Procedure) - Whther applicable for Overlay i.e 

a) Corrosion resistant 

b) hardfacing

c) Groove joint

d) Fillet weld

 

 

But See/look at QW-461.4 shown Postion-1G- Rotated with Diagram

Same in  QW-462.5 ( b & c ) - 1GR for location of test specimen.

 

"I am getting failures in lab tes result of Side bend .

I told u that i am anticipating reasons as follows:-

 

But During PQR Side bend results in my presence :- Inconel Overlayed on WCB plate got Cracked in overlap of one layer another (30% Overlap/sometimes over 30% i.e 50%). beacuse :- Boom/torch is not automatic /(Uncontroled over overlap of anoe layer to another)

I.e We cant do overlap automatically in While Boom (Torch/boom Shifting) is not possible in Transverse type of Weld.

I.e During overlapping of  Each layer :- we mover torch fully automatically to lenght up to  150 mm.After reaching 150 mm , we would have to stop torch & machine & take reverse the Boom(Torch)or Welding poistioners to starting points.

 

I am anticipating thats why I am not getting desired Test results in Side bends.

 

Pls , guide in this case

Thats Why Idea glow in my mind to shift PQR form from Plate to Pipe.

So , there is No need to Stop torch after reaching 150 mm .Torch will shift automaticaaly as per CNC programme to 150 mm ..

"Entire PROBLEM will Solve of overlapping of one layer to another 30% as desired results .

BUT QUERY as Metallurgy Point of view:- Would it definately produce results as usual technique."

(as machine is designed for circumferential type of weld for Claddingof Valves & Pipes)

 

# If above Selection of PQR form i.e Pipe is OK.

Pls , guide on "Selection of Pipe OD with SCH for Qualifying Valve from 4 Inch to 40 Inch & Weld thickness deposited Qualification of min 4 to 5 mm , Our customer requirment of weld thickness depositions is 3.2 mm after machining.""

 

Dear Sir:=- Pls , Share your experiance in this regard /sort of diffculty facing by Me & Engineers

 

With regards,

Ashish P

On Fri, Jan 18, 2013 at 1:07 PM, Materials & Welding <materials-welding@googlegroups.com> wrote:

Dear Sir,
Pls , help out in following query:-

As per API-6A Stds requirements :-

1) We require to Clad/overlay 4mm Inconel-625 on inside (Bore)WCB A216 grA Body (uncomplete Valve).

2) Pls , guide on "selection of PQR qualification " i.e Pipe or Plate.(A216 GrA)

3) Actual Production Welding will be on Automatic PAW machine & Position is 1G (Downhand) -ROTATION, But Valve will on Rotation position (1G-R) during welding.(Automatic)

4) Pls , guide & tell me regarding selection of PQR Form i.e. Pipe or Plate (Also the reason ) 

 

My QC head instructed me to do Traling mail qualification as per both Section -IX & As per EN-15614-7. in single test coupon (Query is follwing point as EN Std)

In EN-15614-7 , Overlay cladding /Hardfacing is defined as

a) Axial Overlay welding-inside/outsidE

b) Circumferential overlay Welding-Inside /outside

I anticipating , that EN Std means to say , If Production weld is Circumferetial (Rotation/or Not rotated) .

that means I Mean to say :- It will make a Big difference in depositing /to be qualified for either Axial or Circumferential.(rotated or no rotated)

Becaause our actual production weld requirment is Circumferential -Rotated.

 

Also, in our Plant PAW-Automatic machine has/is a Circumferential Rotary Positioners .So weld will be generated in Circumferentially around the Plate

PAW machine is design  for Inner Claading /inside bore of Valve (Valve Shape is in Circular/Circumferenial)

I.e We have to place plate  in such a way that Weld should place like Transverse 1G position/type of weld ..

 

But During PQR Side bend results in my presence :- Inconel Overlayed on WCB plate got Cracked in overlap of one layer another (30% Overlap).

I.e We cant do overlap automatically in While Boom (Torch Shifting) is not possible in Transverse type of Weld.

I.e During overlapping of  Each layer :- we mover torch fully automatically to lenght up to  150 mm.After reaching 150 mm , we would have to stop torch & machine & take reverse the Boom(Torch)or Welding poistioners to starting points.

 

I am anticipating thats why I am not getting desired results in Side bends.

 

Pls , guide in this case

Thats Why Idea glow in my mind to shift PQR form from Plate to Pipe.

So , there is No need to Stop torch after reaching 150 mm .Torch will shift automaticaaly as per CNC programme to 150 mm ..(as machine is designed for circumferential type of weld for Claddingof Valves & Pipes)

 

# If above Selection of PQR form i.e Pipe is OK.

Pls , guide on "Selection of Pipe OD with SCH for Qualifying Valve from 4 Inch to 40 Inch & Weld thickness deposited Qualification of min 4 to 5 mm , Our customer requirment of weld thickness depositions is 3.2 mm after machining."

 

 

Thankyou in advance

 

With Regards,

Ashish P

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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.