working principle of indentation machine：
the spot welding process of the indentation machine is to turn on the cooling water; clean the surface of the weldment, after the assembly is accurate, send it between the upper and lower electrodes, and apply pressure to make the contact good; energization makes the contact surface of the two workpieces heated and partially melted , forming a nugget; the indentation machine maintains pressure after power is turned off, allowing the nugget to cool and solidify under pressure to form a welded joint; remove the pressure and take out the workpiece. indentation machine welding current, electrode pressure, energizing time and electrode working surface size and other spot welding process parameters have a significant impact on welding quality.
the indentation machine uses the high temperature arc generated by the positive and negative poles to instantaneously short-circuit to melt the welded material between the electrodes to achieve the purpose of combining the indentation machines. the structure of the indentation machine is very simple. to put it bluntly, it is a high-power transformer that turns 220v ac power into a low-voltage, high-current power supply, which can be dc or ac. the welding transformer has its own characteristics, that is, it has the characteristics of a sharp drop in voltage.