DIY Pulse Arc welding copper directly to cells

[devmonkey]

I've been working on a new handpiece for the welder that will be simpler to produce with improved reliability and ergonomics. Maintaining gas seals and allowing free retraction of the electrode whilst retaining a low resistance, low friction flexible high current connection onto the electrode has been challenging but this design is now fairly reproducible. I have sent out RFQs for the internal CNC brass parts that I would need to make a short production run.

 

[devmonkey]

Testing the new hand piece 0.3mm copper onto 0.2mm steel, 50J

 

[Etienne]

I wish I had this incredible tool in my workbench to make perfect weld and eliminate the risk of damaging cells.
Any update on your prototype, do you anticipate releasing something soon?
As an alternative would there be available TIG welders that would be safer than spot welder? I have no prior experience in spot welding, and a bunch of cells is on its way to my house tomorrow..