ASME Section IX – Can a 6G Qualified Welder Weld with Pipe Rotation?
Malik 87
Dear Welding Experts,
I would appreciate your clarification on the following ASME Section IX question:
If a welder is qualified by a 6G fixed-position and the supporting PQR/WPS was also qualified in the 6G position, can this welder perform production welding with the pipe rotated during welding process?
My understanding is that, according to QW-122, 6G is a fixed position where the pipe is not rotated, while a 6G welder qualification generally qualifies the welder for the applicable welding positions, including 1G, subject to the relevant limitations and variables.
Therefore, can he rotate the pipe during production welding when the welder’s WPQ is 6G?
I would appreciate it if someone could provide the exact applicable clauses from ASME Section IX (QW-122, QW-303, QW-461.9, and any other relevant paragraphs) to support the interpretation.
Thank you in advance for your expert opinion and clarification.
Muhammad Ishtiaq
venkateswara reddy Desireddy
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sridhar cn
QW-122 – Pipe Welding Positions. QW-122 defines the pipe welding positions used for qualification.
Purpose of this clause: This paragraph only defines the welding positions used in qualification. It does not state that a separate
WPS is required for each position.
QW-303 – Limits of qualified positions and diameters.
QW-303.1 – Groove welds states that a welder or welding operator who passes a groove weld qualification test is qualified for
the groove weld, fillet weld, and tack weld positions within the limits shown in Table QW-461.9.
The important point is that position qualification belongs to the welder, not to the WPS.
QW-461.9 – Performance qualification position limits.
This table gives the qualification ranges.
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For groove welds on pipe: |
|
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1G qualifies for the 1G position only |
|
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2G qualifies for 2G & 1G |
|
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5G qualifies for 5G & 1G |
|
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6G qualifies for all positions (1G, 2G, 5G & 6G). |
QW-202 – WPS Qualification
QW-202 explains the scope of procedure qualification. The essential variables for a WPS are listed in Articles
QW-250 through QW-290 for each welding process. There is no essential variable requiring requalification of the WPS when
only the welding position changes.
WPS qualification versus welder performance qualification—the key distinction in ASME Section IX.
Your query: "Can he rotate the pipe during production welding when the welder’s WPQ is 6G?"
1G-Pipe (also known as 1GR, where R is used mostly for training purposes in the rolled position): The pipe is positioned with its
longitudinal axis horizontal and rotated about this axis during welding. The welding is performed from the top, so the weld remains.
in the flat position.
In the 1G rolled position, welding is carried out from the 11 o’clock position to the 1 o’clock position, with the weld remaining in the
flat position. Thus, 1G is mainly used for shop fabrication, where rollers or a positioner can rotate the pipe. The welder can remain
in a comfortable working position while the pipe rotates.
Hence, welding carried out in the 6G position qualifies in 1G (1GR), 2G, 5G & 6G positions.
Trust the above details are clear.
C Sridhar.
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