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Re: [MW:33124] Re: Clarification QW-409.4

By Materials & Welding
Though for base material it is exempted up to -196 deg C the weld metal is restricted for -104 deg .

Hence it is mandatory when you qualifies PQR it is recommended to have impact testing.

If you have existing qualification without notch toughness you can supplement the impact testing followed by establishing test with parameters of existing PQR and support it.


On Mon, 13 Jun 2022 at 08:53, Mohd Siraj <mohd52100@gmail.com> wrote:
dear,

P8 material can be used up to -195C without any impact testing...lests know why you conduct impact testing?


On Wednesday, June 8, 2022 at 8:22:15 AM UTC+3 Yael Nieto wrote:
I have a misgiving wiht QW-409.4

ASME Section IX Ed 2021 describes: 

QW-409.4 A change from AC to DC, or vice versa; and in DC welding, a change from electrode negative (straight polarity) to electrode positive (reverse polarity), or vice versa. This variable does not apply to a WPS qualified for welding base metals that are assigned to P-No. 8, P-Nos. 21 through 26, and P-Nos. 41 through 49.

I have a base metal P8-P8 WPS, so I know if the construction code requires impact testing for base metal(s) or weld metal, then the for the WPS the variable is supplementary essential but my base metal is P8, also aply ?

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