I have a question:
We currently have a Welding Procedure Specification (WPS) and Procedure Qualification Record (PQR) for welding a 25mm plate using a combination of Gas Tungsten Arc Welding (GTAW) and Shielded Metal Arc Welding (SMAW), with impact testing conducted. The weld metal deposited by GTAW is 5mm, and SMAW is 20mm.
Now, if I only intend to use the SMAW process for welding 8mm and 15mm thick plates, both requiring impact testing, would our existing WPS still qualify for this welding scenario?
Minimum thickness is 6mm.
QW-403.6 says ". . . where T is less than 6mm, the minimum thickness qualified is 1/2T . . ." . Since your thickness is not less than the general rule of T to 2T applies.
Note this wording has also given me heart burn. What I have done is to take a 1/4 inch plate (nominally 6mm) and have the thickness machined to 0.249 inches, this then qualifies for thickness 0.124 to 0.499 inches. If I need the thickness I will also weld a 1/2 inch thick plate to qualify 1/2 to 1 inch.
Enjoy.
John A. Henning
Welding & Materials
From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of CHINTUKUMAR GANDHI
Sent: Wednesday, June 06, 2012 5:30 AM
To: material...@googlegroups.com
Subject: [MW:14478] QW-403.6 OF ASME SEC. IX (MIN. THK. RANGE QUALIFICATION)
Dear Experts,
What shall be the minm. qualified thk. range if PQR is qualified with 6 mm. Nom. thk. with Notch toughness properties. Will it be 3 mm. or 6 mm. as per QW-403.6 of ASME Sec. IX?
Further, suppose If I shall qualify this procedure on 5 mm. thk. PQR test coupon (machined from 6 mm. thk.), which thickness shall I have to consider for temperature reduction during subsize test specimen testing? Will it be 5 mm.(actual thk.) or 6 mm. (nom. thk.)?
Awaiting your experts' opinion at the earliest.
Thanks & regards,
C. R. GANDHI
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