Section 12-E1019. TEST METHODS

Insert new Section 1019 in the Mechanical Code to read as follows:

1019.1 Welder qualification tests.  The qualification tests described herein shall be specifically devised to determine a welder’s ability to produce sound welds.  In order to determine the welder’s ability to make groove welds in various plate positions, tests with the groove in the following three positions shall be required:

 

1.  Test Position I – Plates placed in a vertical position with the welding groove horizontal. This test shall qualify the welder to make horizontal flat welds.

 

2.  Test Position II – Plates placed in a vertical position with the welding groove vertical. This test shall qualify the welder to make vertical flat welds.

 

3.  Test Position III – Plates placed in a horizontal position with the weld metal deposited form the underside of the plates. This test shall qualify the welder to make flat welds in the overhead position.

 

1019.2 Weld plate specifications.  The base material of the plates to be welded shall be of flange or firebox steel quality, 3/8 inch (9.5 mm) thick and having a tensile strength of not less than 55,000 pounds per square inch (psi) (379 MPa).  The plates shall be 5 inches (127 mm) long by 6 inches (152 mm) wide, and shall be prepared for a single “V” groove butt joint.

 

1019.3 Preparing test specimens.  The method of preparing test specimens shall be as follows:

 

1. When the welding has been completed, specimens shall be removed as directed, by machine or flame cutting. They shall be approximately 1½ inches (38 mm) wide.

 

2. The weld reinforcement shall be removed by machine or grinding, flush with the surface of the base material.

 

3. The corners of the edges of all test specimens shall be rounded to a radius of not more than 1/15 inch (1.7 mm).

 

In addition to (1), (2) and (3) above, the test specimens shall be prepared as specified in Section IX, paragraph QW-462, “Test Specimens,” of the ASME Code.

 

1019.4 Specimen testing methods and passing criteria.  The method of testing specimens shall be as follows:

 

1.  Specimens shall be bent in a bending jig called the “guided bend test,” until the curvature of the specimen is such that a 1/32 inch (0.8 mm) wire cannot be passed between the curve portion of the plunger and the specimen.

 

2.  Face bend specimens shall be placed with the face of the weld toward the gap in the jig; root bend specimens shall be placed with the root of the weld toward the gap.

 

After removal from the jig, the convex surface of the specimens shall be examined for the appearance of cracks or other open defects.  Any specimen in which a crack or other open defect exceeding 1/8 inch (3.2 mm) measured in any direction is present after the bending shall be cause for failure to pass the test.

 

 

authority

Section 10 of the Construction Codes Approval and Amendments Act of 1986 (Act), effective March 21, 1987 (D.C. Law 6-216; D.C. Official Code § 6-1409 (2012 Repl.)) and Mayor’s Order 2009-22, dated February 25, 2009, as amended.

source

Final Rulemaking published at 61 DCR 3101 (March 28, 2014 – Part 2); as corrected by Errata Notice published at 61 DCR 5246 (May 23, 2014).

EditorNote

The District of Columbia Mechanical Code (2013), referred to as the “Mechanical Code,” consists of the 2012 edition of the International Mechanical Code, published by the International Code Council (ICC), as amended by the District of Columbia Mechanical Code Supplement (2013)(12 DCMR E). The International Mechanical Code is copyrighted by the ICC and therefore is not republished here. However, a copy of the text may be obtained at: http://publicecodes.cyberregs.com/icod/imc/2012/index.htm?bu=IC-P-2012-000005&bu2=IC-P-2012-000019.