Answers go – no go test after projection nut welding
Withstands breaking torque nearly twice that of standard specification
In Projection Nut Welding, to achieve error free results it is very important to apply constant and accurate current. In case the current is less than required it may lead to brittle welding. This kind of nut welding requires retapping. Also if the current is more than required it causes adverse effects like weakening the strength of metal or distortion of thread etc.
As the FORWEL – Kirti Constant Current welding controller assures constant current supply of the previously set current, it has no adverse effects on the thread and thus responds to go-no go test positively.
In this kind of projection nut welding, welded nut withstands breaking torque nearly twice that of standard specification.
The nut welding is strong and thus no retapping is required. This ensures proper locking torque and distortion in thread profile.
No Co2 welding is required which results in minimizing rework and cost reduction.
Avoids frequent destruction testing.
Nut Size Sheet Thickness (mm) Standard Torque Peel strength (kgf-cm) Minimum Torque Peel (kgf-cm) square nut hex nut m5 1.0 to 1.2 118 280 200 m6 1.2 to 2.0 149 350 250 m8 1.6 to 2.0 209 450 400
* comparison chart for typical projection nut welding results on kirti Resistance Welding Machines with Forwel controllers
** precise settings are required for getting the results