Regulated electro-welding device

An electro-welding device for electrically welding plastic elements together, the device comprising:

• a power source for generating an electrical signal, and for having an AC current in circulation,
• an electrical converter AC/DC,
• heating means, electrically connected to the converter for heating the weldable elements, at least locally, up to a temperature which is sufficient for fusing those elements and welding them, together,
• electrical regulating means interposed between the electrical converter and the heating means, the electrical regulating means comprising switching means having successive electrically passing and electrically non-passing phases, the electrical regulating means being subjected to the switch-over rhythm of said switching means for generating a switched over electrical signal having a cyclic ratio (a) which is variable, with 4 α = U RMS 2 U DC 2 ⁢ and ⁢ ⁢ α = t 2 t 1 + t 2 ,
• UDC:
• input electrical voltage of the regulating means,
• URMS:
• variable output electrical voltage of the regulating means corresponding to the electrical current supplied to the heating means,
• t1:
• time interval for each non-passing phase of the switching means,
• t2:
• time interval for each passing phase of the switching means.