forge - How-To Resistance Weld

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Can standard resistance welders be used to weld aluminum up to 2.5 mm (0.098 in) thick?
How will hold time change the resistance weld strength?
If the resistance welding force is increased will the mechanical properties and the nugget diameter of the weld change?
We are butt welding 0.500", 1008 steel. Have tried several forces, pulses and slopes with no success on a 30 KVA welder. Need some guidance.
What is a forge sequence in a weld control?
What is hold time and how can it change the strength of a resistance weld?
What is hold time in a resistance welding schedule?
What parameters should be changed to reduce shrinkage voids in a resistance weld