If you were asking why there is a difference that is much more complicated, but it is a question of the selection of the consumables, the welding heat input and number of passes and the grain structure and degree of refinement of the weld metal. Look at the macros and if the grain structure looks much coarser that is the indication.
By the way the decimal is of no significance in Charpy testing – just work to the whole numbers.
Alan Denney
AKD Materials Consulting Ltd
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of SA
Sent: 06 October 2015 13:55
To: Materials & Welding <materials-welding@googlegroups.com>
Subject: [MW:23671] Acceptable Range of Impact Test Values
Dear All,
There are two PQR's and both are qualified with a coupon of 16 mm thickness. The one is qualified with Submerged Arc Welding (SAW) and other is qualified with Shielded metal arc welding SMAW. When impact testing was done on weld and HAZ of samples taken from both coupons, it showed a lot of difference between impact test values keeping same test conditions. The lowest impact value of sample from SMAW coupon is 143 joules whereas sample from SAW coupon has lowest impact value of 35.1 joules. Is this difference accptable and why?
Waiting from your valuable feedback.
--
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
To post to this group, send email to materials-welding@googlegroups.com.
Visit this group at http://groups.google.com/group/materials-welding.
To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/c95cadd2-ad0a-4dd6-8d31-b1cf85114519%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
No comments:
Post a Comment