3 welders qualify on a test coupon

In accordance with ASME BPVC Section IX, Table QW-452.1 (b) [Note 3] that allowable three welders qualify on a test coupon using the same or a different welding process.

  • Thickness of test coupon (T) 19 mm and over.

Note “T” = thickness of test coupon (base metal); “t” = thickness of weld metal.

Test coupon preparation: see QW-310.1

Type of test required (groove weld):

Visual examination (QW-302.4) and side bend (*).

  • 5G or 6G position: four side bend specimens.
  • Combination of 2G and 5G positions: six side bend specimens.
  • Other positions: 2 side bend specimens.

Alternatively NDE:

  • For welder, see QW-304 - min. 150 mm length of the first production weld.
  • For welding operator, see QW-305 - min. 1000 mm length of the first production weld.
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min. thickness of qualification?

The minimum thickness shall determine in WPS or 1.5 mm.

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