Translation thank you for the post

I answer in Italian, hoping that google translate will do its job well.
About the electric blade welder: To be successful in welding, the two edges of the blade must be clean and free of rust. (Like new), but also the electrical terminals must be perfectly clean.
For annealing, more micro pulses are recommended (to the limit of light emission), moving the blade to the right and left, in order to better distribute the annealing area.
I have an OPUS 400 with an attached blade room. Before I was able to weld, but then it started not to stick anymore.
I assume that the various electrical connections must be cleaned and tightened well.