ASME IX | Definition on pass
ASME IX | Definition on pass
(OP)
I have a question on orbital GTAW welding in ASME IX (2010 edt 2011 add), specifically on how 'passes' are addressed in orbital welding where no filler material is used (i.e. T-joints).
Definition on pass acc. ASME IX;
Let's say a PQR is made based on a pWPS where the electrode only does 1 orbit (i.e. slightly more tahn 360 degrees) around the joint to be welded.
No filler material was used. Joint design is OD up to 1", wall thickness up to 0.083". Notch toughness is not required/addressed by the Code. Code of construction is B31.3.
While welding the pWPS, an additional sample was made to qualify for a WPQ. The orbital welding machine is defined as machine welding in ASME IX.
Now, say we make a new WPS where 2 orbits in stead of 1 are made during welding. Are these 2 orbits then defined as a multi pass?
I believe 2 orbits have to be considered as a multi pass acc the ASME IX definition on passes. Technically one may argue that no extra weld bead or layer is made during the 2nd orbit, hence 2 orbits can also be considered as a single pass.
Assuming 2 orbits are defined as multiple pass;
For the PQR it seems no re-qualification is required, acc QW-256; QW-410.9 is a supplementary essential variable. Hence no restriction.
For the WPQ it seems re-qualification is required, acc QW-361.2(h); the welding operator has changed from single to multiple passes per side.
Anyone who can share his thoughts?
Definition on pass acc. ASME IX;
Quote:
pass: a single progression of a welding or surfacing operation along a joint, weld deposit, or substrate. The result of a pass is a weld bead or layer.
Let's say a PQR is made based on a pWPS where the electrode only does 1 orbit (i.e. slightly more tahn 360 degrees) around the joint to be welded.
No filler material was used. Joint design is OD up to 1", wall thickness up to 0.083". Notch toughness is not required/addressed by the Code. Code of construction is B31.3.
While welding the pWPS, an additional sample was made to qualify for a WPQ. The orbital welding machine is defined as machine welding in ASME IX.
Now, say we make a new WPS where 2 orbits in stead of 1 are made during welding. Are these 2 orbits then defined as a multi pass?
I believe 2 orbits have to be considered as a multi pass acc the ASME IX definition on passes. Technically one may argue that no extra weld bead or layer is made during the 2nd orbit, hence 2 orbits can also be considered as a single pass.
Assuming 2 orbits are defined as multiple pass;
For the PQR it seems no re-qualification is required, acc QW-256; QW-410.9 is a supplementary essential variable. Hence no restriction.
For the WPQ it seems re-qualification is required, acc QW-361.2(h); the welding operator has changed from single to multiple passes per side.
Anyone who can share his thoughts?





RE: ASME IX | Definition on pass
RE: ASME IX | Definition on pass
Best regards - Al
RE: ASME IX | Definition on pass
You might say that there really isnt any layer (as defined in ASME IX), as there's no weld 'deposit'. See definitions of layer and weld bead:
Dont get the me wrong, I just want to know why it's considered as such, so I try to be critical.
RE: ASME IX | Definition on pass
Whether the mechanical properties are affected can only be determined by testing a sample to see what the results are.
Best regards - Al
RE: ASME IX | Definition on pass
RE: ASME IX | Definition on pass
could anyone think of agrument(s) that would not make it feasible to define orbital GTAW welding as automatic welding (see pag 201 ASME IX 2010 edt 2011 add), instead of machine welding?
RE: ASME IX | Definition on pass