The document discusses guidelines for qualifying welders for groove and fillet welding based on test specimens. It provides tables outlining the minimum and maximum outside diameters and thicknesses welders can be qualified for depending on the size of test coupons used. Notes further explain that welders can be qualified for multiple processes and thicknesses based on different test coupons. The thickness qualified is determined individually for each welder, process, and set of variables when more than one is used for a test coupon.

2. ❖Groove-Weld Diameter Limits
Outside Diameter of Test
Coupon, in. (mm)
Outside Diameter Qualified,
in. (mm)
Minimum Maximum
Less than 1 (25) Size welded Unlimited
1 (25) to 27/8 (73) 1 (25) Unlimited
Over 27/8 (73) 27/8 (73) Unlimited
GENERAL NOTES:
(a) Type and number of tests required shall be in accordance with
QW-452.1.
(b) 27/8 in. (73 mm) O.D. is the equivalent of NPS 21/2 (DN 65).

3. Outside Diameter of Test
Coupon,
in. (mm)
Minimum Outside Diameter,
Qualified, in. (mm)
Qualified
Thickness
Less than 1 (25) Size welded All
1 (25) to 27/8 (73) 1 (25) All
Over 27/8 (73) 27/8 (73) All
GENERAL NOTES:
(a) Type and number of tests required shall be in accordance with Table QW-452.5.
(b) 27/8 in. (73 mm) O.D. is considered the equivalent of NPS 21/2 (DN 65).
❖ Small Diameter Fillet-Weld Test

4. Thickness, t , of Weld Metal in
the Coupon, in. (mm)
[Note (1)] and [Note (2)]
Thickness of Weld
Metal Qualified
[Note (3)]
All 2t
1/2 (13) and over with a
minimum of three layers
Maximum to be
welded
NOTES:
(1) When more than one welder, process, or set of essential variables
is used during welding of a test coupon, the thickness, t ,
of the weld metal in the coupon deposited by each welder, for
each process, and with each set of essential variables shall be
determined and used individually in the “Thickness, t , of Weld
Metal in the Coupon” column to determine the “Thickness of
Weld Metal Qualified.”
(2) Two or more pipe test coupons with different weld metal
thickness may be used to determine the weld metal thickness
qualified and that thickness may be applied to production
welds to the smallest diameter for which the welder is qualified
in accordance with Table QW-452.3.
(3) Thickness of test coupon of 3/4 in. (19 mm) or over shall be
used for qualifying a combination of three or more welders
each of whom may use the same or a different welding process.
Thickness of Weld Metal Qualified

5. Test Specimens

6. Fillet-Weld Test

7. Fillet Qualification by Groove-Weld Tests

8. Performance Qualification —Position and Diameter Limitations

9. Range of Filler metal Qualified by the Welder During Welder Performance Qualification