What spot welder are people using these days?


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copec

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Joined
Apr 22, 2020
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18
I'm ready to purchase something as I've always soldered, and wondered what the good value item is these days?

I'm sort of up for anything. I want to spot weld nickel strip, but also if I can spot weld the aluminum tabs on pouch cells, that would be a plus.

I'm looking at items on Amazon and eBay, as well as https://malectrics.eu/product/diy-arduino-battery-spot-welder-kit-v3-2-2-full-bundle-lipo-battery/ and https://www.keenlab.de/index.php/product/kweld-complete-kit/

Okay, now looking for something in the US I can grab quickly while I wait for something of higher quality to get shipped to me.
 
Last edited:

floydR

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Joined
Aug 23, 2017
Messages
1,441
From what i understand keenlab.de ships fast normally I would suggest buying from keith but he has been mia for the last month maybe longer. Last post I saw of his was jan1 on kweld north america fb page Kweld is the way to go. best battery powered spot welder out there. Doubtful about spot welding aluminum many use bolts or pop rivets. But I never tried spot welding aluminum.
Later floyd
 

Dr. Dickie

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Joined
Sep 23, 2020
Messages
326
I used the maletrics, and am quite satisfied. Everyone love the Kweld, but I never could figure out how to order one in the US.
I welded 32 gauge wires, not the nickle strips, but welding is welding.
 

cak

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Joined
Mar 14, 2021
Messages
132
I have one of those boxy aliexpress ones that I wouldn't recommend but needs a new home since I got a Kweld and am never looking back. You can have the alli one if you pay shipping, I am USA MN based.
 

higher_wire

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Joined
Aug 30, 2017
Messages
60
kWeld is great for hobby use. 3D print an electrode holder and case and you're set. I've welded until my hand cramped and it was still going strong. We actually have a pair of them for small mobile jobs and reached out to Keenlab about US distribution after Keith went dark.

kWeld cannot do aluminum.

@Dr. Dickie where did you find a maletrics in the states?
 

Dr. Dickie

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Sep 23, 2020
Messages
326
I think I probably got it from Germany, but I could get it. I could not find anyone selling Kwelds that would even ship to the US.
 

italianuser

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Joined
Feb 25, 2020
Messages
474
@copec did you get yourself the unit after all?

I'm using a Sunko 709AD, bought it on AliExpress at less than 200€ (shipping from the EU so I paid no extra tax fees). Haven't used it a lot yet, did maybe a couple of hundred spots but it's a pleasure to use with the pedal.
 

paddy72

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Joined
Nov 17, 2021
Messages
66
If you're really into DIY here is a spot welder build from an old welding transformer with a new secondary winding in 120mm2 copper (4 wires in parallel, 4 turns): DIY spotwelder with timer control (german)

I added an electronic timer to select the weld time in ms (from ca. 25 ms to ca. 500 ms) or a free manual weld. It can produce ca. 2 kA for a few sec. until the fuse trips. The switching is on the primary side via SSR (solid state relais) in 2 phases, the first for pre-magnetising the core to reduce initial primary current. A 70mm2 copper cable get very hot after only 1-2 sec. of welding at the highest settings. The welding transformer has a 5-state switch at the primary side to adjust the windings.
 

Stevenmann

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Joined
Jan 20, 2022
Messages
3
Cheap chinese spot welder with modifications and i built 14s with 0.2mm double stack
 

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harrisonpatm

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Joined
Jan 5, 2022
Messages
90
Anyone else a fan of DIY MOT spot welders? Control board for dual pulse from ebay was less than $20, if I remember, and everything else was salvaged for free. By no means is this the nicest or best spot welder available, but it does the job if you get your settings figured out, and it's hard to beat the price point and learning experience.

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