TIG Welding Procedure for A519 Gr1020

Hi Joe, Let us know some more details about workpiece' size, type of weld an we will do our best to accommodate you.

Thanks.

size : 4" dia.

Thickness: 19mm.

Weld process: TIG weld, to be shopwelded

Joe, Can you rotate the 2 pieces to weld or is it impossible? Is there access at the inside to weld or is it too deep in the pipe?

Hi.

Yes pipe can be rotated. No access inside pipe. One side weld only.

Hi Joe, I make a guess, no more, but regarding the steel and the size, are you going to weld machined end pieces to manufacture hydraulic pistons? Are you going to make manual welds and about how many pieces?

Are you able to machine the parent ends before welding?

All these factors, and a construction diagram will enable you to make a WPS that works and also gives you a economical work speed and best results.

Depending on the (more) info you provide, a well adapted WPS for that particular job will be possible.

The link, provided by Dladd "WPS America" is a good one, although they work with standard procedures. Provide as much info as you can. TIG is very time- and material consuming for that thickness, if no preparation fill profile has been provided.

It should also be interesting to tell us what size electrode you have and the current available to feed the process. If there are many to weld you should also consider a semi automatic MIG welding under protective gas.

goes 6-8 times faster. In the WPG sheet is also a description of the qualification of the welder. Check also for the available welding material. The principle is simple: the gap between the parent materials has to be filled up. No preparation means a big gap (because you need to be able to direct your torch up to the deepest part to weld under such angle that your arc can strike both flanks) a difficult start (if no backing plate) and more material and electrical energy. A V- type weld with little material, means that you can start almost with the 2 parents together - you can weld 3, 4 or 5 points divided over the circumference and position your pieces.

(1/3rd to 1/4 of the material)

With the pieces horizontal and the weld vertical, start on top with a good fill, rotate without stressing and build up vertically with a small belly overshoot and maintain the form over the whole circumference.

If it goes too slow (too much local heat accumulation) work from opposite sites, like start 0 degr, 180 then 90, 270 till the gap is filled neath. Use the complete flanks of the parents to melt into the gap while filling in. A thorium dipped electrode will do. If touched, grind the touch out and continue with a clean electrode) Use Argon and avoid microscopic craters. (appear typically with too little gas or too high current) In Europe the drawing has all the details on it. For critical welds, the welder needs to show his qualification attests and non -destructive tests (like rontgen) are done. If cylinders or vessels, also pressure tests are needed.

Thanks man. Really appreciate your assistance.

A 519 Gr. 1020 HR has min. 345 MPa and A 519 Gr. 1020 CW has min. 485 MPa. Both (pl. check up your material grade) products are in the form of tubes as per Sec. IX of ASME.

Both are ferrous materials grouped under 'S' no and not in 'P' no. category.

A 519 Gr. 1020 HR is grouped under S1 Gr.1 and A 519 Gr. 1020 CW is grouped under S1 Gr.2.

Under QW-420.2 Sec. IX of ASME, the requirements regarding P-Numbers and P-Number group Number shall apply equally to materials that are assigned to corresponding S-Numbers and S-Number group Number. If PQR is done for S-Numbers and S-Number Gr. Number, then it is limited to S number material only and not to P-Number materials.

i.e., Qualification using a P-Number material qualifies corresponding S-Number materials; but, a qualification done using an S- Number material qualifies corresponding S-Number material only but not a corresponding P-Number materials.

Hence please check up at your end and if you have already done any WPS for P1 Gr.1 (or) P1 Gr.2 (as the case may be) with GTAW process then, you need not repeat it to your above A 519 Gr. 1020 HR (or) CW material.

This will help you to save time and money. If you have not done any WPS earlier, then you have to prepare new WPS/PQR documentation.

If any help is needed, still you can contact us.

Sridhar.

Thanks man.

What about CK 22 DIN 17210, what would be your suggested electrode/rod. Client prefers this to be welded by TIG?

pl. provide chemical and / or mechanical properties of the material proposed by you, since I do not have the details with me right now. Then it will be easier to recommend the filler wires.

sridhar

There are many sites like this "WPS America" that have pre-qualified welding procedures for sale. Just run the filtered search and voila.

Hi Joe,

Computer Engineering, Inc. make an excellent software that will provide you with WPS's, PQR's WPQ's all to ASME Sec IX and D1.1… This can help you complete all requirements…

You are 100% correct. I have used Computer Engineering's Welding Pro Write since 1993 to write my welding documents for 17 years now and it is easy to use after you figure out the program. The only part I have had trouble with was the welder continuity part. That part was very hard for me to figure out at first. I keep do welder cont. in hard paper form by hand as well as on this program just in case I have a meltdown. Welding Pro Write has the ASME code check that won't let you make a code violation and it will have water marks on the document if it does not conform to ASME code.

Hello, you can go to the AWS site and probably buy a SWPS for GTAW this material for $250-$300.00 but you will still have to weld and qualify the procedure once you get the written procedure in hand.

I write all my company's WPSs , PQRs and WPQsas well as the WPSs for the paper mill I work at during the day as well as for any company that needs one and I usually weld them out myself but I still have to pay around 500.00 to get an average 2 process WPS/PQR tested after it is welded out. Special WPSs can cost up to 700.00 for the extra testing that a special WPS may require and/or a WPS that has 3 or more weld processes or for a WPS qualified hard material like the high temperature nickle alloies that take longer to machine or to prepare for testing.

When I write a WPS, PQR and qualify the weld myself I charge $200.00 for most WPS and up 300.00 or more if the WPS is to be qualified on any other material other than SA-53, SA-36,SA 106 B C/S material and/or 304 or 316 Stainless steel material or if the material is thicker than normal Sch.. 80 carbon steel or Sch. 40 stainless steel. Also if the weld coupons and/or the electrodes cost more 10.00 per pound I have to charge the customer for the cost of the coupons as well as the electrodes.

If you have a TIG welding procedure for another type of carbon steel I suggest that you check to see if that material has the same P-number as the 519 material to see if you are covered as long as the other essential variables are identical in both procedures.

I need to know what code or standard you wish to qualify the WPS to like: ASME sec IX, B31.1, B31.3 AWS D1.1, API 1104, 650, 620 and so on. I would need the the thickness and product form of material (plate or pipe) you want to be able to Qualify this WPS on (the WPS is usually qualified on material no less than 1/2 of the thickness of the material to be welded in production) as well as the type of weld joint geometry you want to qualify the procedure on.(is it open butt vee groove, fillet, etc. with or without backing?) Being that this material is in the realms of low carbon steel and if it is below 3/4" thick there should not be pre and post heat requirements to worry about.

You would normally qualify the WPS and generate the PQR for a weld made in a flat position on plate. After you qualify the WPS most people would qualify the welders for welding in all positions on pipe by giving the welder's qualification test on pipe in the 6G , (45 degree angle weld axis) position which will qualify the welder to make butt welds up to 2 x thickness of the welded plate used to qualify the WPS and also for all fillet welds on plate and pipe..

I don't have time to look up this material right now but if I knew the information I requested above I could generate a WPS with the computer welding software I use in pretty in less than an hour.

Good luck,