Re: [Oil&Gas] (oil&gas) Tafsir QW-403.19 ASME Sec IX

 

Pak Dirman,

 

Yang perlu direqualifikasi adalah jika ada perubahan essential variable atau supplementary essential variable (jika disyaratkan). Dalam hal ini persyaratan QW-403.19 hanya essential bagi proses lasan "Inertia and Continuous Drive Friction Welding" (table QW-262). Jika memang proses lasan itu yang dipakai maka perlu requailifikasi WPS jika terjadi perubahan grade material yg dimaksud. 

 

Regards,

DD

(bukan pakar welding)

 

 

 

On Sat, Aug 20, 2011 at 10:19 PM, Dirman Artib <dir.art@gmail.com> wrote:

 

Rekan-rekan pakar welding Yth.

Ramadhan Kareem !

Mohon pencerahan tafsir QW-403.19 dari ASME Sec IX , sbb :

QW-403.19 A change to another base material type or

grade (type or grade are materials of the same nominal

chemical analysis and mechanical property range, even

though of different product form), or to any other base

material type or grade. When joints are made between two

different types or grades of base material, a procedure

qualification must be made for the applicable combinations

of materials, even though procedure qualification tests have

been made for each of the two base materials welded

to itself.

Contoh kasus untuk diskusi :

Jika misalnya saya sudah punya qualified WPS dan didukung PQR pada pengelasan antara base metal ASTM A572 Gr. 50 dg sesama ASTM A572 Gr.50, 

Lantas apabila saya akan mengelas ASTM A572 Gr.50 dgn grade berbeda, misalnya dengan ASTM A572 Gr.70, apakah memerlukan requalification WPS ?

Salam,

d'Art.

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