Search found 40 matches

by NetPro
Nov 05 2020 12:14am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1205
Views: 177215

Re: kWeld - "Next level" DIY battery spot welder

I would highly recommend investigating the copper/nickel sandwich method for welded buses. It's a proven method that provides more than three times the series current, while also running cooler and generating less voltage sag under load. Nickel is a poor conductor, so increasing thickness from 0.15...
by NetPro
Nov 03 2020 10:59pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1205
Views: 177215

Re: kWeld - "Next level" DIY battery spot welder

The fact is, kWeld can do the .2 pure nickel well, but ONLY with the supplied electrodes. My beef with the supplied electrodes is (as good as they weld just after they arrive or you re-dress the tip) lack of repeatability. For consistent results, electrode gap, pressure and tip shape/size must not v...
by NetPro
Nov 02 2020 11:25pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1205
Views: 177215

Re: kWeld - "Next level" DIY battery spot welder

Sorry if there is info in the forum about this topic but I could not find it using the search tool! Is there a way to connect 2 kWelds together to be able to handle more current? I don't need to double what one welder can do but I certainly feel the need for mine to handle probably 20 or 30% more ju...
by NetPro
Jan 08 2020 9:35pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1205
Views: 177215

Re: kWeld - "Next level" DIY battery spot welder

The one issue to consider when trying to enlarge the holes to use the kWeld's supplied electrodes is that if installed in parallel, even if you get real close to each other, the tips would be too far for the positive side of 18650 batteries. Not to mention, the grater distance in the electrodes chan...
by NetPro
Jan 05 2020 9:26am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1205
Views: 177215

Re: kWeld - "Next level" DIY battery spot welder

Searching a bit more I discovered the exact unit in the picture posted by flashtel: On eBay. https://www.ebay.com/itm/Integrated-Hand-held-Spot-Welding-Pen-Spot-Welder-Automatic-trigger-Home-Use-DIY/402009868337?hash=item5d99a7c831:m:mdHw1HlIH_Ejthcn_yxsq2g They even have 3 colors to choose from. Is...
by NetPro
Jan 05 2020 12:00am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1205
Views: 177215

Re: kWeld - "Next level" DIY battery spot welder

I never thought they would include the trigger switch on the hand held device but I am glad to see they did. Turns out there are quite a lot to choose from if you search for "spot welding pen" on aliexpress.com. The one I will order tomorrow is this one: https://www.aliexpress.com/item/400...
by NetPro
Jan 03 2020 7:09am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1205
Views: 177215

Re: kWeld - "Next level" DIY battery spot welder

Welcome to the Club, flashtel! I can only comment on the device shown in the picture because I have done my fair share of electrodes and holders. The device could have a great deal of value IF it had thicker cables to connect it to to the welder. The springs make it a great device because it equals ...
by NetPro
Jan 02 2020 1:44pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1205
Views: 177215

Re: kWeld - "Next level" DIY battery spot welder

I was afraid you would say that. But it was worth trying. Thanks for considering the idea! I have read the whole manual and if I use short wires (around 15cm) made of AWG #4, with the battery I just bought, my kWelds complain of overcurrent. If I use thinner wire (AWG #8), calibration completes succ...
by NetPro
Jan 02 2020 12:41am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1205
Views: 177215

Re: kWeld - "Next level" DIY battery spot welder

Here is a crazy question for kWeld's creator, Mr. T. I recently bought a new AGM battery and both of my kWelds units complain of overcurrent when I try to calibrate them. If I swap the battery and electrode cables with thinner ones, I am able to successfully calibrate them but I know I am getting to...
by NetPro
Sep 16 2019 8:56am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1205
Views: 177215

Re: kWeld - "Next level" DIY battery spot welder

@tatus1969. Perfect. Thanks for info! This is a well documented thing and there is a paper (among several) from a Chinese searcher in a university I can't remember, detailing scientifically his findings. I will post a link to it soon. Traveling overseas now with only my phone and missing my desktop ...
by NetPro
Sep 16 2019 3:02am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1205
Views: 177215

Re: kWeld - "Next level" DIY battery spot welder

Question for Kweld's designer: Do you have any plans for adding a function in a future release that would switch the polarity half way through the welding cycle? As I am sure you know, DC spot welders don't form a similar nugget under the anode and the cathode for reasons we do not need to get into ...
by NetPro
Mar 06 2019 3:03pm
Forum: Items for Sale - New
Topic: JP spot welder
Replies: 1242
Views: 194609

Re: JP spot welder

I've had good success with this seller: https://www.aliexpress.com/item/18650-Lithium-ion-battery-nickel-strip-0-15-8-0-3-8-0-15-10-0/32832222955.html?spm=a2g0s.9042311.0.0.2dd94c4dOjccJ1 Still using a 1kg roll of 0.15 x 7mm I bought several years ago (nearly used it all now), and I just ordered a ...
by NetPro
Feb 25 2019 10:01am
Forum: Items for Sale - New
Topic: JP spot welder
Replies: 1242
Views: 194609

Re: JP spot welder

No worries :) On a different note, I've never been a huge fan of the large copper tips supplied with my JP. They do the job, but make pinpoint close welds difficult. I prefer a much smaller point at the end so I tried various things like filing, grinding with a dremel, but nothing I tried was very ...
by NetPro
Feb 23 2019 11:17pm
Forum: Items for Sale - New
Topic: JP spot welder
Replies: 1242
Views: 194609

Re: JP spot welder

That's strange then. About the only other things that come to mind are using enough pressure on the electrodes, making sure the nickel surface is clean and free of any contaminants (like oil), and maybe the electrode material. I use solid copper wire for electrodes on mine and get great results wit...
by NetPro
Feb 23 2019 10:58pm
Forum: Items for Sale - New
Topic: JP spot welder
Replies: 1242
Views: 194609

Re: JP spot welder

I've had good success with this seller: https://www.aliexpress.com/item/18650-Lithium-ion-battery-nickel-strip-0-15-8-0-3-8-0-15-10-0/32832222955.html?spm=a2g0s.9042311.0.0.2dd94c4dOjccJ1 Still using a 1kg roll of 0.15 x 7mm I bought several years ago (nearly used it all now), and I just ordered a ...
by NetPro
Feb 21 2019 1:19pm
Forum: Items for Sale - New
Topic: JP spot welder
Replies: 1242
Views: 194609

Re: JP spot welder

That's what I originally thought and figured that by buying this battery (brand-new) for the JP welder, I would be all-set: OptimaYellow Top Deep Cycle Battery, Group Size 31T, 900 CC. https://www.optimabatteries.com/en-us/yellowtop-deep-cycle-battery Manufacturer claims an Internal Resistance of 0....
by NetPro
Feb 21 2019 8:57am
Forum: Items for Sale - New
Topic: JP spot welder
Replies: 1242
Views: 194609

Re: JP spot welder

Has anyone found a good supplier of "pure" nickel strips (not the nickel-plated steel kind) 0.20 mm thick X 8 or 10 mm wide? I bought some through aliexpress but I am afraid they are made of some alloy that causes the electrodes to stick big time. I have tried different electrodes material...
by NetPro
Jan 07 2019 12:36pm
Forum: Items for Sale - New
Topic: JP spot welder
Replies: 1242
Views: 194609

Re: JP spot welder

48v is too much. 12v is about the maximum. Consider that on mine, I measured about 3,000A during the pulse at 12v. There has been some success using gigantic capacitors and a 12v supply. The average power is not that much so the caps can get recharged with a reasonably small 12v supply. Fletcher, H...
by NetPro
Jan 07 2019 12:35pm
Forum: Items for Sale - New
Topic: JP spot welder
Replies: 1242
Views: 194609

Re: JP spot welder

48v is too much. 12v is about the maximum. Consider that on mine, I measured about 3,000A during the pulse at 12v. There has been some success using gigantic capacitors and a 12v supply. The average power is not that much so the caps can get recharged with a reasonably small 12v supply. Fletcher, H...
by NetPro
Jan 07 2019 10:51am
Forum: Items for Sale - New
Topic: JP spot welder
Replies: 1242
Views: 194609

Re: JP spot welder

"48v is too much. 12v is about the maximum. Consider that on mine, I measured about 3,000A during the pulse at 12v. There has been some success using gigantic capacitors and a 12v supply. The average power is not that much so the caps can get recharged with a reasonably small 12v supply." ...
by NetPro
Feb 20 2017 9:02am
Forum: Items for Sale - New
Topic: JP spot welder
Replies: 1242
Views: 194609

Re: JP spot welder

I just wanted to add that it isn't all that hard to build one of these spot welders as you see in the video. If you want to use it with a battery, they have someone who programmed an Arduino nano to control the pulse time. The software and programing is on the internet and you can download it and e...
by NetPro
May 20 2016 10:10pm
Forum: Battery Technology
Topic: JP spot-welder, FET-switched, timed adj. pulse
Replies: 617
Views: 77179

Re: JP spot welder

Here are the pics of the jig I made to allow me to quickly (literately, about 2 seconds) and consistently cut a slit on the nickel strip. I know it looks over the top but I had this wonderful phenolic material and a Weecher rotary tool with a straight wand that is great for holding it in a similar f...
by NetPro
May 17 2016 1:19pm
Forum: Battery Technology
Topic: JP spot-welder, FET-switched, timed adj. pulse
Replies: 617
Views: 77179

Re: JP spot welder

Really cool and impressive builds posted recently! My findings on electrodes sticking may not apply to too many configurations out there but I thought I post them just in case it helps someone out of new things to try to resolve it. I did not have much sticking problem with 0.15 mm pure nickel but w...
by NetPro
May 06 2016 2:07pm
Forum: Battery Technology
Topic: JP spot-welder, FET-switched, timed adj. pulse
Replies: 617
Views: 77179

Re: JP spot welder

okashira, Pretty impressive work; it is great that someone is taking the time to research and optimize the design to prevent avalanche damage. One question for you about the white welding cable attached directly to the welder (showing in the picture before last). Is this the crazy-flexible silicone...
by NetPro
May 06 2016 9:53am
Forum: Battery Technology
Topic: JP spot-welder, FET-switched, timed adj. pulse
Replies: 617
Views: 77179

Re: JP spot welder

okashira, Pretty impressive work; it is great that someone is taking the time to research and optimize the design to prevent avalanche damage. One question for you about the white welding cable attached directly to the welder (showing in the picture before last). Is this the crazy-flexible silicone ...