Document: NRC Regulatory Guide
Document ID: e9f2f7f8-8345-4591-a596-70b7ac0be7cf
Document Type: regulatory_guide
Title: Control of Electroslag Weld Properties + HISTORY - HISTORY DG-1223 , Proposed Revision 1, published 06/2009 (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0907/ML090750626.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.34
CFR Part: 
CFR Title: 

Content:
ow a dendritic freezing pattern with a joining angle of less than 90 degrees in the weld center. Tests should be made to ensure that the acceptable weld metal solidification pattern specified above is obtained and that unacceptable patterns will not result. The use of a macro-etch examination is a satisfactory technique to determine the weld solidification pattern, and it should be included in the procedure qualification. 1 Copies of ASME standards discussed herein may be obtained from the American Society of Mechanical Engineers, Three Park Avenue, New York, NY 10016-5990; telephone (800) 843-2763; http://www.asme.org/Codes/Publications//. DG-1223, Page 3 Production Welds The procedure qualification by itself does not ensure that low-alloy steel production welds will meet the weld solidification pattern and mechanical property requirements specified in the procedure qualification. To ensure that welds do comply, it is necessary that the production welds themselves be examined. Where the electroslag welding process is used for longitudinal welds in low-alloy steel vessels, it is customary to continue the welding process into prolongations to the base metal. These prolongations contain both base metal and weld metal and provide representative samples for testing the mechanical properties of the base metal and the weld metal. The weld solidification pattern can be determined from weld samples taken from these prolongations. A macro-etch test on a weld center sample taken across the weld from base metal to base metal in the direction of the weld progression, as shown in Figure A of this guide, would be an acceptable method of verifying that the specified solidification pattern has been obtained, and this test should be made. An acceptable alternative to the macro-etch test for ensuring the soundness of the center weld metal would be to perform an impact test with the specimen notch located at the weld center as shown in Figure A. Section III requires that material