S9074-AQ-GIB-010/248 Rev 1
4-4.1.13.2 Heat Input Calculation. Heat input shall be determined by a., b., or c. below for non-waveform controlled welding, or by b. below for waveform controlled welding. Appendix H of Section IX of the ASME Boiler and Pressure Vessel Code can be consulted for detailed guidance if needed.
a. heat input [joules per inch] = voltage∗amperage∗60 travel speed [inches per minute] b. Heat input determined using instantaneous energy or power by: (1) For instantaneous energy measurements in joules: energy [joules] weld bead length [inches] (2) For instantaneous power measurements in joules per second or watts: heat input [joules per inch] =
joules second
power [
or watts] ∗ arc time [seconds]
heat input [joules per inch] =
weld bead length [inches] c. For shielded metal arc welding only, the volume of weld metal, as measured by length of weld bead deposited per unit length of electrode, may be used when correlated to heat input values determined by 4- 4.1.13.2.a or 4-4.1.13.2.b above. The length of the weld bead per unit length of the electrode shall be recorded along with other heat input variables on the qualification test report. 4-4.1.14 Bead Width for Manual and Semi-Automatic Welding Where Toughness is Required. Where toughness testing is required by table 7-7, footnote 2 and weaving is permitted for bead widths over 3/4 inch, at least 80 percent of the test assembly beads shall be approximately equal to, or greater than, the maximum bead width to be permitted by the procedure; however, this shall not mean that beads such as side wall and root pass beads must meet this criteria where proper fusion and soundness would be degraded. The percentage of beads meeting this maximum width criteria shall be included in the report of 4-6. 4-4.1.15 Multiple Processes. Multiple processes may be qualified in a single butt joint, provided all of the following are met: a. If more than one process is used in a single joint, the processes shall be used in welding the qualification test assembly, unless the processes have been previously qualified and no changes specified in 4-7 and 4-8 have been made. b. The thickness of each process to be qualified in a single joint shall be based on the thickness welded with that process (per table 7-6), except for root layers per 4-4.1.4 and 4-4.1.5; the qualified thickness for all processes combined in a single joint shall be based on the test assembly thickness per table 7-6. c. For joints to be welded with multiple, separately qualified processes, the qualified thickness of each process shall not be additive in determining the maximum thickness of the production joint to be welded; instead, maximum (and minimum) thickness shall be based on the process with the highest qualified thickness, and the maximum thickness welded with each process in a single joint shall not exceed the thickness qualified for the respective process. d. Each process shall be included in all destructive test specimens. Where specimens are too small to include representative weld metal from all processes (e.g., Charpy V-notch specimens), all required test specimens shall be taken from weld metal from each process, except for specimens and processes subject to the following limitations: (1) The weld process involves no more than two layers in qualification and production welds (e.g., the root plus one layer), and (2) The test specimens involved cannot be removed so as to include representative weld metal from each process (e.g., 0.505 all-weld metal tensiles).
4-10
Made with FlippingBook - Share PDF online