Metric units

Joint allowable stress

Shear stress from force

Shear stress from moment

Resulting reduced stress

Strength check

τ red ≤ τ A

Minimum step depth

Design of optimum overlap length
Anticipates that a joint is designed so that any breakage occurs in the joint itself, and not in the basic material.
L opt = max {L min , L 1 }
where:

Meaning of used variables for metric units:

S Us	Joint strength in tension [MPa]
k S	Shear safety factor
S Ub	Tensile strength of basic material [MPa]
F	Transferred force [N]
d	Step diameter [mm]
L	Step depth [mm]
T	Torque [MPa]

English units

Joint allowable stress

Shear stress from force

Shear stress from moment

Resulting reduced stress

Strength check

τ red ≤ τ A

Minimum step depth

Design of optimum overlap length
Anticipates that a joint is designed so that any breakage occurs in the joint itself, and not in the basic material.
L opt = max {L min , L 1 }
where:

Meaning of used variables for metric units:

S Us	Joint strength in tension [MPa]
k S	Shear safety factor
S Ub	Tensile strength of basic material [MPa]
F	Transferred force [N]
d	Step diameter [mm]
L	Step depth [mm]
T	Torque [MPa]

Guiding values for solder joint strength

Soft solder alloys

Brazing filler metals