WPS QW-410 Technique

ASME Section IX WPS : QW-410 Welding Technique Example

ASME Section IX Welding Variables for a WPS : QW-410 Technique

• QW-410.1

  • For manual or semi-automatic welding, a change from the stringer bead to weave bead, or vice versa

• QW-410.3

  • A change in the orifice, cup, or nozzle size

• QW-410.5

  • A change in the method of initial and interpass cleaning

• QW-410.6

  • A change in the method of back gouging (grinding, carbon arc gouging, etc…)

• QW-410.7

  • For machine or automatic welding a change in width, frequency, or dwell time of the oscillation technique

• QW-410.8

  • A change in the contact tube to work distance

• QW-410.9

  • A change from multiple passes per side to single pass per side

• QW-410.10

  • A change from a single electrode to multiple electrodes or vice versa for machine or automatic welding only

  • PWHT condition can make this variable not apply, see Section IX for details

• QW-410.11

  • A change from closed chamber to out of chamber conventional torch welding in P-No. 51 thru P-No. 53, but not vice versa

  • So if the procedure was qualified with conventional torch welding it is acceptable to change to closed chamber without requalification

• QW-410.15

  • A change in the spacing of multiple electrodes for machine or automatic welding

• QW-410.25

  • A change from manual or semiautomatic to machine or automatic welding and vice versa

• QW-410.26

  • The addition or deletion of peening

• QW-410.64

  • addresses vessels or parts of vessels made from P-No. 11A and P-No. 11B

  • See Section IX for details

• QW-410.87

  • A change from multiple passes per side to a single pass per side

  • This variable does not apply in some PWHT conditions, or for some materials, see Section IX for details

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Essential Variable: Variables for which a change is considered to affect the mechanical properties (other than notch toughness) of the joint. Essential variable changes that fall outside their qualified range requires re-qualification. 

Supplementary Essential Variable: Variables for which a change is considered to affect the toughness properties of the joint, heat-affected zone (HAZ), or base material.

Supplementary essential variables become additional essential variables in situations where toughness testing is required. When toughness testing is not required supplementary essential variables are not applicable. 

Non-Essential Variable: Variables for which a change is considered to not affect the mechanical properties of the joint. This allows for editorial revisions to procedures within that permitted by Section IX without the need to requalify the procedure. Nonessential variables shall be documented on the procedure. 

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