4" PIPE FITTED IN 6G POSITION. IF I WANT TO QUALIFY 2 WELDERS USING SAME JOINT FOR 6G POSITION -WELDER 1 WELDS THE 6 -3-12 O' CLOCK (UPHILL PROGRESSION) & WELDER 2 WELDS THE 6 -9 - 12 O' CLOCK(UP HILL PROGRESSION) AND WELD LENTGH MEETS MORE THAN 6". HERE BOTH ARE QUALIFIED FOR 6G POSITION- PLS CLARIFY?

The answer is NO. You can not meet the requirement of mechanical testing (due to insufficient weld length pr welder) as well as minimum length of Radiography (if you intend to qualify welder by RT) in this case.

You placed a similar question for plate, which caused a certain interest. I gave my answer thinking it was a real approach. Other reader gave his "strict to Code" interpretation. I did not see any comment to that discussion from your side. Would you please clarify whether you are facing real, practicl cases or your are posting theoretical questions? I am not interested about the second.
Mauro Gonzaga

Qaqcmpm,
Based on this posting and the other one regarding plate tests it appears that you are trying to find shortcuts.
This forum is to provide assistance and advice based on technical matters - shortcuts are things you pick up over the years based on experience.
Again it is totally impractical to have 2 welders share the welding on a 4" pipe. The 6G is done in the 45 degree position and one side (forehand) is easier than the other side (backhand). What are you going to do, give one welder the easy side and one welder the hard side ?

svghate,
The circumference of a 4" pipe is 358 mm so there is sufficient length for 2 x 150 mm radiographs.
Regards,
Shane

MR GONZAGA,
ITS OUR PRACTICAL PROBLEM WE NEED TO QUALIFY MORE WELDERS BUT LESS TIME AND TO AVOID WASTAGE OF MATERIAL WE PLANNING THIS. IN MY PREVIOUS QUESTION ALSO INSTAED OF DOING TESTS IN 2 PLATES WE DID IN SINGLE PLATE AS MR SHANE ADVISED.

THANKS MR SHANE SO IT IS NOT ADVISABLE.

Shane,

When welder is qualified by RT and test coupan is pipe then OD circumference is not considered. It is always a root circumference. Code is silent on it. When test coupon is plate and length is 150 mm then one get RT of 150 mm but in this case root as well as entire weld is of 150 mm. [b]Now you consider that the welder is welding 2.5" Sch XXS pipe where OD circumference meets the requirement of 150 mm but ID circumference will not meet. Hence it is always a root circumference when the question of ability of welder to weld is being tested.[/b]

As a good Code Practice, never qualify the welder on RT since there are no means to check ductility of deposited weld which is normally verified by bend test.

Surendra Ghate.

[quote="Ballbearing"]Qaqcmpm,
Based on this posting and the other one regarding plate tests it appears that you are trying to find shortcuts.
This forum is to provide assistance and advice based on technical matters - shortcuts are things you pick up over the years based on experience.
Again it is totally impractical to have 2 welders share the welding on a 4" pipe. The 6G is done in the 45 degree position and one side (forehand) is easier than the other side (backhand). What are you going to do, give one welder the easy side and one welder the hard side ?

svghate,
The circumference of a 4" pipe is 358 mm so there is sufficient length for 2 x 150 mm radiographs.
Regards,
Shane[/quote]

ITS OUR PRACTICAL PROBLEM WE NEED TO QUALIFY MORE WELDERS BUT LESS TIME AND TO AVOID WASTAGE OF MATERIAL WE PLANNING THIS. IN MY PREVIOUS QUESTION ALSO INSTAED OF DOING TESTS IN 2 PLATES WE DID IN SINGLE PLATE AS MR SHANE ADVISED.


OK, I understand your problem, appreciate you explained. However are you sure to save time and material? If the test fails, both welders fail and both have to repeat, angry each other.
Otherwise, if you complete the test piece with one welder, after the test is passed you may cut the weld and weld the test pieces from the side they were not welded before.
Mauro Gonzaga

Surenda,

"When welder is qualified by RT and test coupan is pipe then OD circumference is not considered. It is always a root circumference. Code is silent on it. Please advise where this is noted in any code.Welders are qualified every day in every part of the world using a 2" coupon and readiography.Are you suggesting all of their welder qualifications are invalid ? When test coupon is plate and length is 150 mm then one get RT of 150 mm but in this case root as well as entire weld is of 150 mm.

As a good Code Practice, never qualify the welder on RT since there are no means to check ductility of deposited weld which is normally verified by bend test." Welders are permitted by ASME IX QW 304 to be qualified using RT. How can it not be good Code practice if the code allows it. The arguement can run both ways, you could theoretically have internal lack of fusion for over 50% of the coupon and if the bends weren't taken from that area the test would be deemed acceptable.

Surendra Ghate

Regards,
Shane

General Observation:
I am very surprised with so much attention to this question. To be competitive on the market, you really need to have good welders. Good shops consider welders training and qualification as good investment. In addition, per Section IX and per every Quality Manual the AI may request the welder re-qualification any time. I would never allow two welders be qualified on the same test coupon. This is insane.

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AI-OR-US