#Electric arc welding is done by the #heat generated by the electric arc between electrode and metal,
The electric arc is the discharge of electrical charges through a gap between the conductors and the temperature of the electric arc up to 5000 degrees Celsius is enough to melt #iron and its alloys.
Resistance spot welding (RSW) or point welding is a process in which contacting metal surface points are joined by the heat obtained from #resistance to #electric current
It used to weld metal sheets (0.5-3mm) thickness by holding the two pieces together and applying a force then electric current flows through copper electrodes that concentrates current into small spot at the welded pieces
