Understanding “Position”

in Welding
 This presentation is copyrighted
by Sperko Engineering
• General permission is granted for use of this
presentation including printing thereof for
educational purposes provided credit is
given to Sperko Engineering.
• Use of the figures herein in any other
publication without specific written
permission is prohibited.
 This presentation is copyrighted
by Sperko Engineering
• The primary purpose of this presentation is
twofold:
– Make sure that code users understand the
difference between testing positions and
production welding positions
– Help users understand how to read the figures
that define production welding positions shown
on the next page.
Production Welding Positions
Groove Welds Fillet Welds
 Standard Test Positions
Positions 1G, 3G, 6G, 2F, 5F, etc. are
specially defined standard positions
used for testing. They are properly
referred to as Test Positions. Similar
positions are found in ISO 6947
identified as PA, PC, PG, etc.
 Standard Testing Positions
Test positions are discreetly defined
positions of test coupons that are used
when mostly when testing welders.
These positions have tolerance of ±15°
from the defined horizontal planes and
±5° from a defined vertical or inclined
plane. See QW-120
 Testing Position 1G/PA
±5°
Weld Axis Horizontal

±15° Plate Horizontal

 Test Position 2G/PC
Weld Axis
Horizontal
±5°

±15°
Plates Vertical
Test Position 3F/PF or PG

±5°
Test Position 6G/HL045 or JL045

45°±5°
 Test Positions are Discreetly
Defined
• Because of tolerance limits on test positions,
positions in between test positions are undefined!
• That is, a weld that is inclined 22° uphill and
rotated 36° about its axis has no “G” or “F”
position. Such a position, however, may be
encountered during production welding.
• Production welding positions, therefore, need to
be defined contiguously.
 Test Positions Qualify Welders
for Specific Welding Positions

Test Positions  Welding Positions

Translations from test positions to welding positions are
made in the construction codes. QW-461.9 is typical.
Test Positions  Welding Positions
 Welding Positions
Note to table:
(1) Positions of welding as shown in QW-461.1 and QW-461.2
F = Flat
H = Horizontal
V = Vertical
O = Overhead
(2) Pipe 2-7/8 in outside diameter and over.
Welding positions for groove
welds are defined by the
following diagram.

NOTE
Welding Position Diagrams are
contiguous.
Welding Positions for Groove Welds
 Tabulation showing transition
points between welding positions
Tabulation of Positions of Groove Welds

Position Diagram Reference Inclination of Axis Rotation of Face

Flat A 0 to 15° 150 to 210°
Horizontal B 0 to 15° 80 to 150°
210 to 280°
Overhead C 0 to 80° 0 to 80°
210 to 360°
Vertical D 15 to 80° 80 to 280°
E 80 to 90° 0 to 360°

How this table and the diagram on the previous page work are shown in the
following diagrams

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 Let’s start with the
Flat Position

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 Welding Positions
Tabulation of Positions of Groove Welds

Position Diagram Reference Inclination of Axis Rotation of Face

Flat A 0 to 15° 150 to 210°
Horizontal B 0 to 15° 80 to
150°
210 to 280°
Overhead C 0 to 80° 0 to 80°
210 to 360°
Vertical D 15 to 80° 80 to 280°
E 80 to 90° 0 to 360°

How this table and the diagram on the previous page work are shown in the
following diagrams

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 Flat Positions Axis Inclination

15°

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 Start at Nominal Flat Position

Face of weld is up

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 Flat Upward Inclined Limit

Weld may
incline upward
to a limit of 15°

15°

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Flat Upward Inclined Limit
But the welder
could be traveling
down the incline. . .

15°

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 Flat Downward Limit Is Implied

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 Welding Positions
Tabulation of Positions of Groove Welds

Position Diagram Reference Inclination of Axis Rotation of Face

Flat A 0 to 15° 150 to 210°
Horizonta B 0 to 15° 80 to 150°
210 to 280°
Overhead C 0 to 80° 0 to 80°
210 to 360°
Vertical D 15 to 80° 80 to 280°
E 80 to 90° 0 to 360°

How this table and the diagram on the previous page work are shown in the
following diagrams

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Flat Position --Rotation About Axis
150° 180°
30° 210°
30°

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 Flat Rolled Limit Clockwise
180° 210°

30°

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 Flat Rolled Limit Clockwise
30° 210°
Equivalent to
rotating
The plate 30° 180°

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Flat Rolled Limit Counterclockwise
150° 180°

30°

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 Flat Rotated Limits Not
Considering Inclination

60°
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 Welding Positions
Tabulation of Positions of Groove Welds

Position Diagram Reference Inclination of Axis Rotation of Face

Flat A 0 to 15° 150 to 210°
Horizonta B 0 to 15° 80 to 150°
210 to 280°
Overhead C 0 to 80° 0 to 80°
210 to 360°
Vertical D 15 to 80° 80 to 280°
E 80 to 90° 0 to 360°

How this table and the diagram on the previous page work are shown in the
following diagrams

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 Flat Uphill Limit Rotated

15°

60°

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 Flat Downhill Limit Rotated

15°
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 Composite Flat Position Ranges

60°

30°

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Compare this range to 1G/PA. . .

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 Testing Position 1G/PA
±5°
Weld Axis Horizontal

±15° Plate Horizontal

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 Flat ≠ 1G !!!!

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 Welding Positions
Tabulation of Positions of Groove Welds

Position Diagram Reference Inclination of Axis Rotation of Face

Flat A 0 to 15° 150 to 210°
Horizontal B 0 to 15° 80 to 150°
210 to 280°
Overhead C 0 to 80° 0 to 80°
210 to 360°
Vertical D 15 to 80° 80 to 280°
E 80 to 90° 0 to 360°

How this table and the diagram on the previous page work are shown in the
following diagrams

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Horizontal Position Axis Inclined

15°

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 Basic Horizontal Position

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 Horizontal Position Uphill
Inclined Limit

15°

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 Horizontal Position Downhill
Inclined Limit

15°
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 Welding Positions
Tabulation of Positions of Groove Welds

Position Diagram Reference Inclination of Axis Rotation of Face

Flat A 0 to 15° 150 to 210°
Horizontal B 0 to 15° 80 to 150°
210 to 280°
Overhead C 0 to 80° 0 to 80°
210 to 360°
Vertical D 15 to 80° 80 to 280°
E 80 to 90° 0 to 360°

How this table and the diagram on the previous page work are shown in the
following diagrams

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 Horizontal Position Rotated
150° 210°

70° range
70° Range

80°

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280°
 Start at the Flat Rolled Limits
180°
210°

30°

Let’s go to an
end view. . . .
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 Horizontal End View
Horizontal starts where 210°
Flat ends. . . .

30°

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 Horizontal Rotates to where the
plate is perpendicular to the ground
Horizontal rotates
clockwise . .

30°

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 Horizontal Position Rotated
Limit Horizontal ends
90° here. . . .

10°

30°

280°
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 Non-inclined Horizontal Position
Limits
Starts with plate
Rotated 30°

70°

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 Non-inclined Horizontal Position
Limits
Finishes with plate
Rotated 10° beyond
perpendicular

70°

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 Composite Horizontal Position
Limits

15°

15°
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 Compare Horizontal to 2G/PC

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 Test Position 2G/PC
Weld Axis
Horizontal
±5°

±15°
Plates Vertical

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 Horizontal ≠ 2G/PC !!!!

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 Overhead Position

80°

280°
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 Basic Overhead

Face of weld
is overhead!!!

0°
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 Basic Overhead End View

Face of weld
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Engineering
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 Overhead Partial Rotation
End View

Face of weld
is overhead
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 Overhead Maximum Rotation
End View

Face of weld on
This side

280°

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0°
 Overhead Maximum Opposite
Rotation End View

Face of weld on
This side

80° 280°

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0°
Same Rotation in Isometric View

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 Basic Overhead

Face of weld
is overhead

0°
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 Overhead Partial Rotation
Isometric View

Face of weld
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is overhead
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 Overhead Maximum Rotation
Isometric View

Face of weld
On this side

280°

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0°
 Overhead Maximum Opposite
Rotation Isometric View

Face of weld
is on this side

80° 280°
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Overhead Position
Axis Inclination
80° range

80°

280°
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Basic Overhead for Inclined Axis

Face of weld
is overhead

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 Overhead Inclined Axis Rotation

0°
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 Overhead Inclined Axis Limit

80°

0°

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 Overhead Inclined Axis Limit
Weld can rotate 360°
about vertical axis
while inclined 10°
forward tilt. 80°

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 Overhead Inclined Axis Limit
10°

Weld can rotate about

The vertical axis

0°
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 Overhead Inclined Axis Limit
10°

Weld can rotate about

The vertical axis

0°
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 Overhead Inclined Axis Limit
10°

Weld can rotate about

The vertical axis

0°
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 Overhead Inclined Axis Limit 10°

Weld can rotate about

The vertical axis

0°
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 10°
Overhead Inclined Axis Limit

Weld can rotate about

The vertical axis

0°
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 Overhead Inclined Axis Limit
10°

Weld can rotate about

The vertical axis

0°
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 Overhead Inclined Axis Limit10°

Weld ends up back

Where it started!

0°
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Composite Overhead Position Limits
360° 10°

80°

80°

0°
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 Overhead ≠ 4G/PE !!!!

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 80°
Vertical Position Part 1
65° Range of Inclination
From 15 to 80°.
Face of weld is up

15°

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Vertical Position Part 1
Range of inclination
Starts at 15°
Face of weld is up

15°

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Vertical Position Part 1
Range of inclination
continues upward. . .

Greater than 15°

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Vertical Position Part 1
Until reaching 80°

80°

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Vertical Position Part 2
When the “E” portion
of the
diagram is reached
80°

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 80°
Vertical Position Part 2
The “E” portion
of the diagram --
360° Rotation
About vertical axis

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Vertical Position Part 2
The “E” portion of the
diagram begins here. .
80°

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Vertical Position Part 2
Partial rotation about
Vertical axis

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Vertical Position Part 2
More rotation about
Vertical axis

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Vertical Position Part 2
Even more rotation about
Vertical axis

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Vertical Position Part 2
Rotated 180° about
Vertical axis

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Vertical Position Part 2
Continuing Rotation about
Vertical axis

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Vertical Position Part 2
Continuing Rotation about
Vertical axis

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Vertical Position Part 2
Continuing Rotation about
Vertical axis

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Vertical Position Part 2
360° of Rotation about
Vertical axis completed

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Vertical Position Part 3
200° Range
of Rotation

80°

280°

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Vertical Position Part 3

Start here with inclination

Uphill or Downhill 15°
Face of weld upward

15°

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Vertical Position Part 3

Rotate face while holding

Inclination constant

15°

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Vertical Position Part 3

Continue rotating with

Inclination constant

15°

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Vertical Position Part 3

Rotated to vertical limit

Inclination constant

15°
280°
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Vertical Position Part 3

Return to starting position

Uphill or Downhill 15°
Face of weld upward

15°

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Vertical Position Part 3

Rotate face of weld

Opposite direction
Inclination Constant 15°

15°

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Vertical Position Part 3

Continue rotating
Opposite direction
Inclination Constant 15°

15°

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Vertical Position Part 3

Plate near vertical

Inclination Constant 15°

15°

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Vertical Position Part 3

Plate at vertical limit

of rotation.
Inclination Constant 15°

80°

15°

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Vertical Position Part 3
200° Range of
Rotation inclined
Uphill or Downhill 15°

80°

15°
280°
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 Vertical Position Part 3

80°

200° Range of Rotation

Inclination angle
Increases 280°

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Vertical Position Part 3
80°
200° Range of Rotation
Inclination angle
Increases more. . .
280°

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Vertical Position 360°

Composite
65°

200°

80°

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160° range
Welding Positions for Fillet Welds

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 Flat Fillet Weld

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 Horizontal Fillet Weld

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Welding Positions for Fillet Welds

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Welding Positions for Fillet Welds
Tabulation of Positions of Fillet Welds

Position Diagram Reference Inclination of Axis Rotation of Face

Flat A 0 to 15° 150 to 210°
Horizontal B 0 to 15° 125 t0 150°
210 to 235°
Overhead C 0 to 80° 0 to125°
235 to 360°
Vertical D 15 to 80° 125 to 235°
E 80 to 90° 0 to 360°

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 Welding Positions for Fillet Welds
The Horizontal Range
Is smaller for fillet welds
Than it is for groove welds

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Welding Positions for Groove Welds

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 Questions?
Feedback?
Can you explain the diagrams to
your friends?

Send e-mail to:

Sperko@asme.org

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