S9074-AQ-GIB-010/248 Rev 1
Table 7-16. Axial Load and Torque Values for Procedure Qualification 1/, 2/, 3/ - Continued
NOTES: 1/ Torque is calculated using stud minor diameter (root of threads) and the following tensile strengths: Carbon steel 50,000 lb/in 2 CRES 80,000 lb/in 2 Aluminum 35,000 lb/in 2 Titanium alloy 120,000 lb/in 2 The use of studs having minimum diameters other than those listed or of materials not in the table will require calculation of minimum required axial and torque loads based on the actual stud diameter and minimum required tensile strength for the stud and stud material involved in accordance with the equations below. Such calculations shall be submitted with the procedure qualification data.
axial load (pounds) = D 2 ×π×TS 4 torque (inch − pounds) = axial load × D × k
where: D
= Stud minor diameter (inches) TS = Tensile strength as specified in the applicable stud or material specification (pounds per square inch) k = Lubrication factor. To ensure the weld is loaded primarily in tension, the threads of the stud shall be lubricated with molybdenum disulfide, graphite base, or comparable lubricant, in which case k = 0.15 For information, the following tensile strength values may be used: HY-80 95,000 psi HY-100 115,000 psi 2/ If austenitic corrosion-resistant steel studs are welded to carbon steel plate, the torque values for carbon steel studs may be used. 3/ Not applicable to class 2B or internally-threaded studs (see 4-4.4).
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