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TUBE-- is used for Heat transfer and OD is controlled PIPE-- is used for Mass and Heat transfer

Is it advisable to carry out HOT CORRECTION after PWHT, any code ref for Yes or No of this activities

Ref ASME B31.1, 124

No code explain, but it is based on manufacturer recommendation

Why do u want to change from GTAW to GMAW because for this thickness GTAW is best, If required u can 2% H2 in Argon shielding to have penetration and Finish of weld.

Direct Helium or Argon will not have wetting action which leads to undercut and moreover, surface tension is more without addition of oxidation gases in small portion. Both Argon plus 2percent O2 or 2.5% Co2 are good for best wetting action, penetration etc

NDE shall be done before or after PWHT to verify the soundness of metal or weldments. PWHT is not testing techniques. To relieve Residual stresses and to get original properties

Due to its coarse grain, u will not get proper interpretation, but nowadays, advanced probes are being used. For less thick back-wall effect will be there.

If u use ER70S6, do not increase Argon%, because u will land into hardness problem

For metal transfer 3 are essential 1. Wire dia 2. Shielding gas 3. Welding Parameters(Ampere & Volt) To get spray with 90Ar+10Co2 is ok, provided for dia 1.2mm transient current should be around 230 to 250amps

Expert Pl see the sketch attached and it is being used in steam line Ur inputs on whether these joint configuration recommended in P91 welding If so what is the welding procedure to be followed...

yes

it is difficult to note down Voltage for manual welding process like GTAW< SMAW etc

As GTAW said, fluidity of SS weld is harder than CS due to presence of Ni in SS, As aware, Welding Nickel metals and its alloys is more difficult than other metal. so some technique and skill is required for SS compared to CS

For high temperature service, creep strength is very important, to achieve creep strength carbon is require more to form carbides. L is having max carbon .03 and conventional with .08max

we use P22 materials only

u can easily qualify provide u take lot precautions in cleaning, heat input etc

Since u r going to use FCAW in pipe, it is better to do in pipe. Ur Lab is not correct. u can do it

it is being used in power industries?

fOR LESSER THICK OF T22, PREHEAT MAINTANANCE/POST HEATING NOT REQUIRE,BUT PREHEAT IS MUST TO AVOID PWHT FOR LESS THAN 16MM THICK OR 13MM FILLET WELD