Welder qualification thickness, diameter - AWS D1.1

[laurudolphy]

Dear Experts,

I have got a welder who has welded on a 14" Pipe Wall thickness of 25.4 mm in 6G position SMAW using E7018 electrode with Single V Butt Joint.
The root pass was 6 mm and the SMAW weld deposit was 19.4 mm

The range to which he is qualified is as follows as per my interpretation.

Position - ALL (Table 4.10)
SMAW process - with Backing ONLY (Table 4.12)
F No. - 1,2,3,4 (Table 4.12)
Thickness qualified - 5 mm to unlimited either on Pipe or Plate (Table 4.11 point 2)
Pipe Diameter qualified - 7" to unlimited (Table 4.11 note e)

Request your comments please.

Thanks.

[wefel]

No comments since your interpretation is right

[laurudolphy]

Thanks Wefel

[laurudolphy]

Wefel,

Assuming all things remain same as per my first query except the combination of processes which now is GTAW/FCAW instead of GTAW/SMAW as originally was,
Would the qualified range be as follows:-

Position - ALL (Table 4.10)
FCAW process - with Backing ONLY (Table 4.12)
F No. - 1,2,3,4,5,6 (Table 4.12)
Thickness qualified - 5 mm to unlimited either on Pipe or Plate (Table 4.11 point 2)
Pipe Diameter qualified - 7" to unlimited (Table 4.11 note e)

Your comments please.

[wefel]

I agree with all of them except the comment regarding F-number since it is applicable only for the SMAW process. Please have a look at the table 4.12, variable 2. So, for the qualification range of welder, there is no reason to consider the F-number of welding consumable of FCAW process.

[laurudolphy]

Hi, Wefel,
I agree with you, that was intentional, as FCAW will always be F6.

Thanks again
Regards
Rudolf

[laurudolphy]

Hi, Wefel,

Just wanted to reconfirm with you, Is my interpretation of the Pipe Diameter correct, or should it be 100mm (4") OD as minimum instead of 7".

Thanks

[wefel]

According to table 4.11, note e: "the minimum pipe size qualified shall be 1/2 the test diameter or 4 inches, whichever is greater". In your case the test diameter is 14 inches and since 7 greater of 4 then you qualify for 7 inches to unlimited pipe diameter.