Welding Procedure Specifications

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It seems to me you are qualified to make welding procedures and you already have done so. Now with your post you are confusing me as with your qualification you should be able to answer your own question.

I will try to answer it with a thought:

Since you do not know if you can use the same welding parameters for the fillet weld I would think that a new procedure would be best to furnish. Now if you was to ask about the parameters I will have to pass. This is not my expertise.

Rephrase your question maybe and somebody might be able to give you advice.

T2 with 2 mm looks quiet small what is this?

AS per ASME section IX QW 451.4, the following is mentioned

Fille tweld is qualified when the groove weld is qualified in accordance with either QW 451.1 or 451.2.

So, if you have qualified on groove welds, you need not qualify the WPS for fillet welds. Second question, only guidelines are available. Less current for less thickness, higher current fot higher thickness of material.

Thanks for the guidance.

I think my second question is somewhat confusing so let me explain it.

If I am going to use the same PQR for making a fillet weld then should i use the same parameters that are mentioned in PQR or the parameters could be different? i.e. WPS for fillet weld should contain the same parameters mentioned in PQR of butt weld or it could be different?

For GTAW Electrical Characteristics are not essential variables. See QW-256 (GTAW) and QW-409. ASME Section IX

Yes its non essential.

Now things are clear.

Many thanks for your guidance.

One more thing to clear.

I have qualified butt weld on 8mm test plate. Now I am going to make a fillet weld of 2 mm component with 8 mm. Now I have to make a WPS for this job. My question is what welding parameter range (i.e. current, voltage, wfs etc.) I will write in this new WPS as these parameters would be entirely different from those used in making a butt weld having plate thickness of 8mm.

Thickness 2 mm. GTAW. Sure?

Yes. I have to weld nozzle having tube thickness of 2 mm with cylinder having thickness of 8 mm.

Sorry, nozzle?, branch conection?, weldolet? sockolet? t=2mm

1. Should I qualify a welding procedure for fillet welds separately or I can use the same PQR for butt weld to make a fillet weld?

a) No separate PQR is required for qualifying fillets once your PQR was established on a groove butt joint. Butt joints automatically qualifies groove butts from 1.60 mm to 16 mm (double the thickness used) and all sizes of fillets on all thicknesses of plates and sheets.

Hence you can used the same PQR for your fillet joints also irrespective of thickness.

2. If I can use the same PQR for making fillet weld then what welding parameters (voltage, current,wfs etc.) will used in WPS for fillet welds.

a) This again hypothetical and welding parameters depends up on the size of fillet and thickness of plate or sheet. In your case, u do not require a separate WPS.

You have not mentioned the fillet leg. tungsten and filler metal sizes etc.

Assume the leg to be 6 mm or so in first case (if it is not dissimilar fillet leg size. then it could be 20 * 6 mm) and min. of 2 to 3 in the second case.

With 2 mm filler & 2.4 mm tungsten, you can use in between 65 to 75 amps & 12 to 13 volts (multi-pass technique) and app. 45- 50 amps & 11 to 12 volts for 2.0 mm (single pass) sheet.

Hope above details will help u and you can add or reduce 10 % depending up on position.

Sridhar.

Many thanks Sridhar.

One more thing to clear.

I have qualified butt weld on 8mm test plate. Now I am going to make a fillet weld of 2 mm component with 8 mm. Now I have to make a WPS for this job. My question is what welding parameter range (i.e. current, voltage, wfs etc.) I will write in this new WPS as these parameters would be entirely different from those used in making a butt weld having plate thickness of 8mm.

For fillet with 2 mm sheet GTAW process the parameters could be 40 - 45 amps & 11 to 12 volts, 6.00 mm nozzle opening and a weld travel speed of 10 to 12 cms. per minute.

But, you may require a Pulsed TIG process in place of conventional TIG while welding on 2 mm thick sheet as it may avoid burn throughs (on 2 mm sheet) during welding.

If u do not have, increase the travel speed or reduce amps by 10% or so. Using 1.60 mm filler wire with 2.0 mm Tungsten could be better. wfs is applicable in MIG only.

Sridhar.

1. Should I qualify a welding procedure for fillet welds separately or I can use the same PQR for butt weld to make a fillet weld?

Butt weld will qualify fillet weld.

Ref:- ASME BPVC QW 202.2(c) Qualification of Fillet weld

Ref:- ASME BPVC Sec-VIII Div-1 UG-84(h)(2)

"When the welding procedure employed for production welding is used for fillet welds only, it shall be qualified by a groove weld qualification test."

2. If I can use the same PQR for making fillet weld then what welding parameters (voltage, current, wfs etc.) will used in WPS for fillet welds?

You can alter electrical parameters to suit your welding requirement as long as weld metal is free from toughness requirement. Electrical parameters are non essential variables in general case.However, it is better to stay with in +/- 10% to 15% variation from PQR values.

Many thanks.