Specification for Weld Studs

Arc Weld Stud – Specifications

These basic specifications are typical values of the mechanical properties of Stud Welding Products weld studs.

Specifications: Stud Welding Products Weld Studs are commonly produced to AWS Specifications D1.1, D1.5 and or D1.6. Threaded weld studs and No Thread weld studs are available upon request to various international specifications.

Tensile and Torque Strengths: The data was calculated based on the formulas shown below.

 

Tensile Load           L= SA

Torque                     T=0.2x D x L

META*                      A=Pi/4 x [D – (0.9743/N)]

 

A= Mean Effective Thread Area (META)*              D=Nominal thread Diameter

L= Tensile Load Pounds                                        N= Threads Per Inch

S= Tensile Stress in PSI                                        T= Torque in Inch Pounds

 

*META is used instead of root area in calculating screw strengths because of closer correlation with actual tensile strength. META is based on mean diameter, which is the diameter of an imaginary coaxial cylinder whose surface would pass through the thread profile approximately midway
between the minor and pitch diameters.

**Please note, in actual practice a stud should not be used at its yield load. A factor of safety must be applied. It is generally recommended that studs be used at no more than 60% of yield. However the factor of safety may vary up or down, depending on the application. The user will determine the appropriate safety factor.

***Please note, Torque figures based on assumption that excessive deformation of thread has not taken relationship between torque/tension out of its proportional range. All torque figures are shown in foot pounds (ft lbs).

Shear values were calculated at 75% of the Ultimate Tensile Load of the stud.

Materials

Low Carbon Steel weld studs are available in ASTM A108 / A29, Grade C1010 to C1020
material per AWS D1.1. In Stainless Steel, ASTM A-276 / A-493 Grades 302, 304, 310, 316, 321 are
options. Stainless threaded weld studs are mostly stocked in grade 302HQ / 30430.

LCS – Low Carbon Steel

• Chemical Properties
  • C – .23% Max. P – .040% Max.
  • – .90% Max. S – .050% Max.
• Mechanical Properties
  • Tensile Strength: 60,000 PSI Min.
  • Yield Strength: 50,000 PSI Min.
  • Elongation in 2 inches: 20% Min.
• Mechanical Properties (Annealed)
  • Tensile strength: 50,000 PSI
  • Yield Strength: 35,000 PSI
  • Elongation in 2 inches: 25%

HSS – High Strength Steel

• Mechanical Properties
  • Tensile Strength: 120,000 PSI Min.

304SS – Stainless Steel
Type 302/304/305/316

• Mechanical Properties
  • Tensile Strength: 85,000 PSI Min.
  • Yield Strength: 40,000 PSI Min
  • Elongation in 2 inches: 45%
• Mechanical Properties (Annealed)
  • Tensile Strength: 80,000 PSI
  • Yield Strength: 30,000 PSI Min.
  • Elongation in 2 inches: 50%

 Aluminum Alloy (5000 series)

• Mechanical Properties
  • Tensile Strength: 42,000 PSI Min.
  • Yield Strength: 30,000 PSI Min.
• Threads – Standard threads are UNC-2A for male threads, UNC-2B for female. Some sizes are also stocked in UNF-2A and 2B sizes. Other thread classifications are available on special order. Whenever possible, all studs are thread rolled. However it is common for longer studs to be cut threaded.
• Plating – Zinc plating, is available according to ASTM-A 164-55 RS. Other plating materials such as Nickel Plating and Copper Plating are also available . Zinc plated studs must be capped
  on the weld end to preclude the plating from compromising the weld quality.
• Annealing – SWP arc welding studs can be annealed to a maximum of 75 Rockwell B for low carbon steel; 85 Rockwell B for stainless steel.