705 - STRUCTURAL STEEL FABRICATION - BRIDGES
700-29 If representatives from other states or third parties witnessed a test, records of the test must by signed
by the witness. SUBSECTION 6.1 INSPECTION – GENERAL REQUIREMENTS Add the following to paragraph 6.1.1.1: Within a KDOT project, QC shall not be performed by an inspector or their assistants who are, or were previously, engaged in the welding, the general assembly , or the application of coatings. This requirement also applies to work done under other AWS welding codes. SUBSECTION 6.7 NONDESTRUCTIVE TESTING (NDT) Delete paragraphs 6.7.1, 6.7.1.1, and 6.7.1.2 and add the following: 6.7.1 Groove welds in main members as identified in Contract Documents shall be QC tested by nondestructive testing. Unless otherwise specified, radiogra phic testing shall be used on butt joints. Groove welds in T and corner joints shall be tested by ultrasonic testing. The requirements for radiographic testing and ultrasonic testing apply equally to shop and field welds. 6.7.1.1 Radiographic testing of welds shall be pe rformed according to the following requirements:
1.100% of all welded girder and rolled beam flange butt joints.
2.All except the middle ⅓ of all welded girder or rolled beam web butt joints. 6.7.1.2 Ultrasonic testing of welds shall be performed according to the following requirements:
1.100% of each joint subject to ca lculated tension or stress reversal.
2.25% of each joint su bject to compression or shear. If un acceptable discontinuities are found in spot testing, the entire length shall be tested. Delete paragraphs 6.7.6, 6.7.6.1, 6.7.6.2, 6. 7.6.3, 6.7.6.4, and 6.7.6.5 and add the following: 6.7.6 When magnetic particle testing is used, the procedure and techniques shall be in accordance with the dry powder magnetic particle examination of welds using the yoke method. 6.7.6.1 The yoke method shal l be performed according to ASTM E 709, and the standard of acceptance with 6.26 of the Code.
1.The yoke method shall be performed using half-wave rectified direct current or alternating current.
2.Electromagnetic yokes shall have lifting forces complying with TABLE 705-1 . TABLE 705-1: ELECTROMAGNETIC YOKE SPACING Current Type Yoke Pole Leg Spacing (YPS) 2"YPS<4" 4" YPS6" AC 10 lbs. Not Applicable DC 30 lbs. 50 lbs. 6.7.6.2 Prior to magnetic particle testing, the surface shall be examined, a nd any adjacent area within a minimum of 1 inch of the su rface to be tested, shall be dry and free of c ontaminants such as oil, grease, loose rust, loose sand, loose scale, lint, paint, welding flux, and weld spatter. Cleaning may be accomplished by detergents, orga nic solvents, descaling solutions, paint removers, vapor degreasing, sand or grit blasti ng, and ultrasonic cleaning methods. 6.7.6.3 The poles shall be oriented in two directions approximately 90 degrees apart at each inspection point, to detect both longitudinal and transverse discontinuities. The pole position shall overlap as testing progresses to insure 100 percent inspection of the areas to be te sted. Discontinuities are best detected when their axis is normal to the magnetic lines of force. Therefore, the yoke technique is most sensitive to discontinuities whose major access is normal to a line drawn between the two poles. 6.7.6.4 A report of magnetic particle examinati on shall be prepared and provided to the owner.
1.The report shall include the following minimum information: (a) Part identification
b.Examination procedure number (if applicable)
c.Date of examination (d) Technicians name, certification level, and signature
e.Name and signature of contractors or owners, Inspectors, or both who witnessed the examination 705 - STRUCTURAL STEEL FABRICATION - BRIDGES
700-30 (f) Examination results
g.Equipment make and model
h.Yoke spacing used
i.Particle manufacturer’s name and color (2) One copy of the report shall be provided to the contractor for the owner. Delete paragraph 6.7.7 and add the following: 6.7.7 For detecting discontinuities in non-magnetic materials including stainless steel to stainless steel or stainless steel to carbon steel, liquid penetrate inspecti on will be used in lieu of magnetic particle inspection. The standard methods, set forth in ASTM E 165 shall be used for liquid penetrate, and the standards of acceptance shall be in accordance with 6.26 of this code. SUBSECTION 6.10 RADIOGRAPHIC TESTING (RT) - PROCEDURE Delete paragraph 6.10.9 and add the following: 6.10.9 FILM SIZE - When the joint thickness is less than 3 inches, radiographs shall be 4 1/2 inches x 17 inches in size. When the length of th e joint is such that more than one radiograph is required, one of the films may be shortened to 4 1/2 inches x 10 at the contractor option. When joint thicknesses are 3 inches or greater, the minimum film size shall be 7 inches x 17 inches. Larger radiogra phs may be required in areas where there have been excessive repairs or where there are joints with unusual dimensions. Delete paragraph 6.10.12 and add the following: 6.10.12 One radiograph identification number shall be painted on the steel no closer than 3/4 inch from the weld edge at each radiograph location. Corresponding lead numbers shall be superimposed on the painted numbers to produce an image on the radiograph. A combination of letters and numbers may also be used. Two location dots shall be painted on the steel at each radiograph location no closer than 3/8 inch from the weld edge. The dots shall be placed at a random distance from the steel plate edges which are pe rpendicular to the length of the weld. The dots shall be placed in different loca tions for each radiograph location. One l ead arrow shall be placed so that its tip is superimposed on each of the two location dots. A location letter shall be painte d immediately under each arrow and a lead letter shall be superimposed on each painted letter. When radiographs are viewed, only those films representing the same joint should have location arrows an d location letters perfectly superimposed. Any additional information shall be produced on the radiograph no less the 3/4 inches from the edge of the weld either by pre-printing or by placing lead letters and numbers on the steel. See Figure 1 and Figure 2. Delete paragraph 6.10.13 and add the following: 6.10.13 Information required to be shown on the radiograph shall include: the complete KDOT bridge number, initials of the radiographic inspection company, initials of the fabricator, the fabricator's shop order number, the radiographic identification number, the date, and the weld repair number if applicable. Add a new paragraph 6.10.15: 6.10.15 Unless otherwise noted on the shop drawings all butt welds will be evaluated as tension welds.
Source: Kansas Standard Specifications for State Road and Bridge Construction, 2015 Edition. Pages 360–361 of 978.