Ariston Pacific, Inc. 5/9/2016 - Laserfiche WebLink

N 1 2 In the sixteenth paragraph, the first item in the second subparagraph is revised to read: 3 4 The clearance to the top surface of bridge decks 5 and bridge approach slabs +1/4 in/-0". 6 7 6-02.3(24)E Welding Reinforced Steel 8 This section is revised to read: 9 10 Welding of steel reinforcing bars shall conform to the requirements of ANSI/AWS D1.4 11 • Structural Welding Code - Reinforcing Steel, latest edition, except where superseded by 12 the Special Provisions, Plans, and these Specifications. 13 14 Before any welding begins, the Contractor shall submit a Type 2 Working Drawing 15 consisting of the welding procedure for each type of welded splice to be used, including 16 the weld procedure specifications and joint details. The weld procedure specifications 17 shall be written on a form taken from AWS D1.4 Annex A, or equivalent. Test results of 18 tensile strength, macroetch, and visual examination shall be included. The form shall 19 be signed and dated. 20 21 Welders shall be qualified in accordance with AWS D1.4. The Contractor shall be 22 responsible for the testing and qualification of welders, and shall submit Type 2 Working 23 Drawings consisting of welder qualification and retention records. The weld joint and 24 welding position a welder is qualified in shall be in accordance with AWS D1.4. The 25 welder qualifications shall remain in effect indefinitely unless, (1) the welder is not111 26 engaged in a given process of welding for which the welder is qualified for a period 27 exceeding six months, or (2) there is some specific reason to question a welder's ability. 28 29 Filler metals used for welding reinforcing bars shall be in accordance with AWS D1.4 30 Table 5.1. All filler metals shall be low-hydrogen and handled in compliance with low- 31 hydrogen practices specified in the AWS code. 32 33 Short circuiting transfer with gas metal arc welding will not be allowed. Slugging of 34 welds will not be allowed. 35 36 For the purpose of compatibility with AWS D1.4, welded lap splices for spiral or hoop 37 reinforcing shall be considered Flare-V groove welds, indirect butt joints. 38 39 The Contractor is responsible for using a welding sequence that will limit the alignment 40 distortion of the bars due to the effects of welding. The maximum out-of-line permitted 41 will be 1/4 inch from a 3.5-foot straight-edge centered on the weld and in line with the 42 bar. 43 44 The ground wire from the welding machine shall be clamped to the bar being welded. 45 46 Where epoxy-coated steel reinforcing bars are specified to be spliced by welding, the 47 epoxy coating shall be left off or removed from the surfaces to be heated, but in no 48 cases less than six inches of each bar being welded. After the welding is complete, the 49 Contractor shall apply epoxy patching material to the uncoated portions of the bar in 50 accordance with Section 6-02.3(24)H. 51 I AMENDMENTS TO THE 2014 STANDARD SPECIFICATIONS BOOK Revised: 8/3/15