By cwb_qc
Date 01-18-2002 15:50
We understand that the ASTM A511 & A554 type 304L is in base metal group B with a minimum tensile strenght of 75ksi and it match filler metal group B witch is also 75ksi.
But if we look for ASTM A240 type 304L, it is in base metal group A with a 70ksi minimum tensile strenght. As per clause 3.0 we can use ER308L filler metal (75ksi) to weld ASTM A240 type 304L (70ksi), but note 2 of table 3.2 required corresponding filler metal group of table 3.3. Therefore as per table 3.3 we could not use filler metal group B (ex: ER308L) to weld base metal group A.
Futhermore, in table 3.3 how come we can use filler metal group A to weld base metal group B of table 3.2. This is base on the note of table 3.3:
"Group A also includes all of Group B base metal of table 3.2".
That goes against clause 3.0.
Thank you for your time.