In Welding Procedure of ASTM A 106 Gr. Pipes, Position 6G, if root run is made with E6010 Electrode (F No. 3) & second run is made with E7018 Electrode (F No. 3), what can be the welder qualification range for F No. Is this situation (Different F Nos. for different layers) mentioned in Section IX ?

Is it right to do this ?

Hi,

E6010 Electrode is assigned to F No. 3
E7018 Electrode is assigned to F-No. 4 (not to F No. 3),


Please have a look to table QW-353. This is a list of all essential welding variables for a SMAW performance qualification. One of these essential welding variables is the F-No (QW-404.15). That means your situation (Different F Nos. for different layers) is mentioned in Section IX ,

Please note F No. 3 qualify for F1 through F3 while F No. 4 qualifies for F1 through F4.

In addition the common used welding position with a high efficiency for E6010 (high cellulose sodium covering) is vertical downwards while this position for E7018 (potassium covering) is not possible, which is a reason from the real world that both shall be considered individually. Welding progression (vertical upward/downward QW-405.3) is an essential variable to.

_________________
Kind regards,
Juergen Fleischfresser

Thanks Mr. Juergen

My other question is that if the welder makes 1st run of 5 mm weld thickness with F No. 3 (E-6010), and 2nd run of 5 mm thk with F No. 4 (E-7018), then will he qualify for
(1) Maximum 10 mm thick weld of F No. 3 & maximum 10 mm thick weld of F No. 4 ?
or
(2) Maximum 20 mm thick weld of F No. 3 & maximum 10 mm thick weld of F No. 4 ? (Since F No. 4
qualifies for F No. 3)
or any other range ?

For example, If with this QAP, he welds a Pipe of 20 mm thick with 1st run of 5 mm weld thickness with F No. 3 (E-6010), and 2nd, 3rd & 4th Run of 5 mm weld thickness each with F no. 4, then is it acceptable ?

Yash

I assume the first run is the root run not back welded.

With the assumption above the filler metal for the root (F-No. 3) is welded without backing, while the filler metal for the other runs (F-No. 4) is welded with backing (backing material is the deposited weld metal from the previous welded runs).
Filler metal F4 welded with backing qualifies for F1-, F2- F3- and F4 filler metal with backing only. Therefore the root run with F3 filler metal is not qualified by F4 filler metal welded with backing.

Please use one essential variable not isolated from the other applicable variables.

_________________
Kind regards,
Juergen Fleischfresser

Dear Mr. Juergen,

Thanks for your help.

You are right. The first run is 5 mm thick root run with F No. 3 without backing. Second run is 5 mm thick with F No. 4 with backing of first run weld metal.

What now I understand is, I can weld maximum 10 mm thick weld metal of F No. 3 (With or without backing) & maximum 10 mm thick weld metal of F No. 4 (only with backing).

Am I right ?