Butt Solder Joint Calculation Formulas

Allowable stress

Joint tensile stress

Minimum part thickness

Strength check

σ σ A

Meaning of used variables for metric units:

S U

Joint strength in tension [MPa]

k T

Tension safety factor

F

Transferred force [N]

b

Width of connected parts [mm]

s

Thickness of connected parts [mm.

Meaning of used variables for English units:

S U

Joint strength in tension [psi]

k T

Tension safety factor

F

Transferred force [lb]

b

Width of connected parts [in]

s

Thickness of connected parts [in]

Guiding values for solder joint strength

Soft solder alloys

Brazing filler metals