Hello, first time posting here. Please bear with me as I don't understand the terminology probably as well as I should.
I have welders who have been tested on B-U 4a-GF as per the lower diagram on page 94 of the 2006 d1.1 manual. The process was GMAW, the groove angle was 45 deg, thus the root opening was 1/4.
This test was done in the 2G postion.
The material used was 1" thick A36. Per the chart on page 63, this is a group II material. Page 67 indicates that 1" A36 requires a category B preheat, in this case a minimum of 50 deg F. When the tests were performed, the ambient air temp was about 80 deg, and was so noted in the documentation we got from the CWI.
Everybody "passed" this test. We were told we were qualified to unlimited thickness for materials in either Group I or Group II. We have been operating under this assumption.
I now have work which is a little thicker. It's 3" thick, and it is A572 grade 50. Again per page 63, this is in the same group as we tested on originally. On page 67 however, table 3.2 says that we must preheat to a minimum to of 225 degrees F.
My CWI is telling me that this is a change in an essential variable, and that I must re-test using A572 coupons (1" thick), preheated to 225 degrees, as we again were only tested at 80 deg preheat originally.
Is he correct in telling me this or not? My customer wants to see copies of my "d1.1 documentation", is my original test OK or do I in fact need to re-test to what the CWI says?
Thanks in advance for any input!
I have welders who have been tested on B-U 4a-GF as per the lower diagram on page 94 of the 2006 d1.1 manual. The process was GMAW, the groove angle was 45 deg, thus the root opening was 1/4.
This test was done in the 2G postion.
The material used was 1" thick A36. Per the chart on page 63, this is a group II material. Page 67 indicates that 1" A36 requires a category B preheat, in this case a minimum of 50 deg F. When the tests were performed, the ambient air temp was about 80 deg, and was so noted in the documentation we got from the CWI.
Everybody "passed" this test. We were told we were qualified to unlimited thickness for materials in either Group I or Group II. We have been operating under this assumption.
I now have work which is a little thicker. It's 3" thick, and it is A572 grade 50. Again per page 63, this is in the same group as we tested on originally. On page 67 however, table 3.2 says that we must preheat to a minimum to of 225 degrees F.
My CWI is telling me that this is a change in an essential variable, and that I must re-test using A572 coupons (1" thick), preheated to 225 degrees, as we again were only tested at 80 deg preheat originally.
Is he correct in telling me this or not? My customer wants to see copies of my "d1.1 documentation", is my original test OK or do I in fact need to re-test to what the CWI says?
Thanks in advance for any input!
