Reference for thickness of the welding seam is related to thickness of material (this value is variable, depending on the overlap of the welding seam, material as hardness and tin coating, welding pressure, welding current and welding frequency).
T = S x 1.75
T = thickness of the welding seam
S = thickness of tin plate
Example:
T = 0.15 x1.75 = 0.2625 mm
Necking tool tolerance
D = S+W+L+P+E (mm)
D = difference between inside/outside diameter of necking tool
S = thickness of tin plate
W = thickness of welding seam measured by micrometer (we should measure beginning, middle and end of the welding seam)
L = thickness of outside lacquer stripe 0,02 mm
P = thickness of inside powder stripe 0,07 mm
E = extra space (0.05 mm)
Example:
D = 0.15 + 0.26 + 0,02 + 0,07 + 0.05 = 0.55 mm
S = 0.15 mm / W = 0.26 mm / L = 0,02 mm / P = 0,07 mm / E = 0.05 mm
