AWS B4.0M:2000 pdf download

AWS B4.0M:2000 pdf download.Standard Methods for Mechanical Testing of Welds
1. Scope
1.1 This section covers the bend testing of groove welds in butt joints and the bend testing of surfacing welds. The standard gives the requirements for bend test specimen preparation, test parameters and testing procedures but does not specify the bend radius requirements or accep- tance criteria. 1.2 The base materials may be homogenous, clad or otherwise surfaced, except for hardfacing. 1.3 This standard is applicable to the following, where specified: (1) Qualification of materials, welding personnel and welding procedures (2) Information, specifications of acceptance, manu- facturing quality control (3) Research and development 1.4 When this standard is used, the following informa- tion shall be furnished: (1) The specific location and orientation of the specimens (2) The specific types of tests, for example, face bend, side bend or root bend and number of specimens required (3) The type of data required and observations to be made (4) Bend radius or percent (%) elongation (5) Postweld thermal or mechanical processing treatments 1.5 Safety Precautions. Safety precautions shall con- form to the latest edition of ANSI Z49.1, Safety in Weld- ing, Cutting, and Allied Processes, published by the American Welding Society. Note: This standard may involve hazardous materials, operations, and equipment. The standard does not pur- port to address all of the safety problems associated with its use. It is the responsibility of the user to establish ap- propriate safety and health practices. The user should determine the applicability of any regulatory limitations prior to use.
6. Apparatus
6.1 Guided bend specimens may be tested in either of two types of fixture. One type is the guided bend fixture, which is designed to support and load the specimen in a three point bending mode. The alternate is a wraparound bend fixture that fixes one end of the specimen and uses a roller to force the specimen to bend around a mandrel. 6.2 The guided bend fixture shall have the dimensions given in Figures A1 or A2. 6.3 The wraparound bend fixture shall have the dimen- sions given in Figure A3. 6.4 The radii of the plunger shown in Figures A1 and A2 or the mandrel shown in Figure A3 shall be specified or determined from the relationship expressed by Figure A4 between minimum required elongation and the thickness of the specimen. When specimens wider than 38 mm are to be bent, the mandrel shall be at least 6 mm wider than the specimen width.
7. Specimens
Bend test specimens shall be prepared by cutting the weld and the base metal to form a specimen rectangular in cross section. The surfaces cut transverse to the weld shall be designated as the sides of the specimen; the other two surfaces shall be designated as the face and root sur- faces as appropriate. Transverse specimens may have the side, face or root of the weld as the tension surface. Lon- gitudinal specimens may have the face or the root of the weld as the tension surface of the specimen. 7.1 Transverse Side Bend. The longitudinal axis of the specimen is perpendicular to the weld, and the specimen is bent so that one of the side surfaces becomes the ten- sion surface of the specimen. The side showing the more significant discontinuities (if any) shall be the tension side. Transverse side bend test specimens shall conform to Figure A5. Transverse side bend specimens are used for plates or pipe that are too thick for face bend or root bend specimens and are recommended for welds with narrow fusion zones. 7.2 Transverse Face Bend. The longitudinal axis of the specimen is perpendicular to the weld and the specimen is bent so that the weld face becomes the tension surface of the specimen. Transverse face bend specimens shall conform to the requirements of Figure A6 for plate and Figure A7 for pipe welds. 7.3 Transverse Root Bend. The longitudinal axis of the specimen is perpendicular to the weld and the specimen is bent so that the root surface of the weld becomes the tension surface of the specimen. Transverse root bend specimens shall conform to the requirements of Figure A6 for plate and Figure A7 for pipe welds.