AWS D1.4/D1.4M pdf free download
AWS D1.4/D1.4M pdf free download.Structural Welding Code- Steel Reinforcing Bars.
1.4 Application 1.4.1 General Requirements. This code shall be used in conjunction with the prescribed general building code requirements and is applicable to all welding of steel reinforcing bars, using the processes listed in 1.6, and performed as a part of reinforced concrete construction or in the manufacture of precast concrete components. 1.4.2 Impact Properties. The weldments specified in this code shall not be used where impact properties are a requirement of the general specification. Impact testing requirements of welded steel reinforcing bars are not included in this code. 1.4.3 Engineering Approval, All references to the need for approval shall be interpreted to mean approval by the Engineer.
1.5.2 Unknown Composition. When a steel reinforcing bar not listed in 1.5.1 is approved under the provisions of the general building code or by the Engineer, its chemical composition and carbon equivalent shall be provided and welding procedure shall be qualified in accordance with the requirements of 8.2 and all other requirements prescribed by the Engineer. 1.5.3 Approved Base Metals. Base metals, other than those listed in 1.5. 1, shall be one of the structural steels listed in the latest edition of AWS D1.1, Structural Welding Code- Steel, or any steel stipulated in the contract documents and the welding procedure shall be qualified in accordance with the requirements of 8.2 and all other requirements prescribed by the Engineer. 1.5.4 Carbon Equivalency. In order to determine minimum preheat requirements as defined in Table 7.2. the carbon equivalent of steel reinforcing bars shall be calculated as shown in 1.5.4.1 or 1.5.4.2, as applicable. 1.5.4.1 ASTM A706/A706M Carbon Equivalency Exception. For all steel reinforcing bars, except those designated as ASTM A706/A706M, the carbon equivalent shall be calculated using the chemical composition, as shown in the material test report, by the following formula: C.E= %C + %Mn/6 (Eq. 1) 1.5.4.2 ASTM A706/A706M Carbon Equivalency. For steel reinforcing bars designated ASTM A706/A706M, the carbon equivalent shall be calculated using the chemical composition, as shown in the material test report, by the following formula: C.E. = %C + %Mn/6 + %Cu/40 + %Ni/20 + %Cr/10 – %Mo/50 – %V/10 (Eq. 2)
1.5.4.3 Unavailable Material Test Reports. If material test reports are not available, chemical analysis to determine C.E. value may be made on bars representative of the bars to be welded. 1.5.4.4 Preheat for Unknown Material Composition. If the chemical composition is not known or obtained: (1) For bar size number 6 [19] or less, use a minimum preheat of 300°F [150°C]. (2) For bar size number 7 [22] or larger, use a minimum preheat of 500°F [260°C]. (3) For all ASTM A706/A706M bar size numbers, use Table 7.2 C.E. values of“over 0.45% to 0.55% inclusive.” 1.6 Welding Processes 1.6.1 Welding Processes. Welding shall be performed with shielded metal arc welding (SMAW), gas metal arc welding (GMAW), gas tungsten arc welding (GTAW), or flux cored arc welding (FCAW). 1.6.2 Other Welding Processes. Other welding processes may be used when approved by the Engineer, provided that any special qualification test requirements not addressed by this code are met to ensure that welds satisfactory for the intended application will be obtained. AWS D1.4/D1.4M pdf download.
