kWeld - "Next level" DIY battery spot welder

[Diggs]

I figured it was foot pedal operated but didn't think about a switch tied to the pedal. No pics needed - thanks!

 

[julian.koenig87]

Ive tried several suppliers and varying thicknesses of cupronickel, and they all welded like crap. Just use copper foil and NICKEL not nickel plated steel, that stuff will start rusting in no time at all

Ohhh... Now I see. Did not realise that this is an alloy! So yeah. I will go with 0.1 copper foil an 0.15 nickel on top.

Because I have also nickel/steel laying around. How critical is nickel/steel for tool battery packs (sealed) used indoors and outdoor only in dry conditions? Never heard of such relevant problems you stated.

 

[ganzey]

Ohhh... Now I see. Did not realise that this is an alloy! So yeah. I will go with 0.1 copper foil an 0.15 nickel on top.

Because I have also nickel/steel laying around. How critical is nickel/steel for tool battery packs (sealed) used indoors and outdoor only in dry conditions? Never heard of such relevant problems you stated.

if you keep them dry, and not in a super humid environment it wont be detrimental, probably a couple years before you see any rust, but you would be surprised how fast they can rust with humidity. i suppose its not that big of a deal when you are doing copper under them, as they are essentially just there to hold the copper in place. however, welding them is not very fun because they will shoot out a ton of sparks at every weld vs nickel with almost none.

nickel is fairly cheap, and you dont need a whole lot, i usually just cut out little buttons (like a 10mmx10mm piece) of it that go on top the copper to weld, since it the copper is what carries the current. a 2 meter strip is enough for about 100 cells

 

[julian.koenig87]

Hi. I recieved the kweld. Nice tool!

I changed the inputconnection to (in germany quite common) 2x10mm tinned copper an soldered 3 XT90 plugs to it. Now I can decide wether I weld with 2 or 3 lipos. Pictures attached with one 3S 5Ah 65-130C HK Lipo and one old 3S 4Ah 60C good quality lipo.

Calibrating at (3,85V) 1750A. So good range. Can go higher if I needed.

Pictures shows 0,3 nickeliron (original Hilumin):

To itself: 105J
To 18650 + 80J
To 18650 - 75J

Could possibly a little to hot. But Im happy.

 

[julian.koenig87]

Nice.



For the tool batteries (dewalt clone) I use the given 0,15 NiFe with 0,1 copper underneath.



Weld with 65J @1550A to 21700 cells.

 

[eee291]

The shipping price sure has exploded since the 13€ in 2018. OMG

I wanted to buy the laser cut case and the firmware update tool, i expected it to be a total of about 50€ with shipping but 110€ is just insane. This has to be a mistake, right?

 

[riba2233]

What is USt 20%?

 

[eee291]

Value added tax

 

[riba2233]

Are you ordering within the EU or are you outside?