Search found 31 matches

by NetPro
Sep 16 2019 8:56am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 883
Views: 101353

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: 883
Views: 101353

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: 171052

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: 171052

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: 171052

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: 171052

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: 171052

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: 171052

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 and thick...
by NetPro
Jan 07 2019 12:36pm
Forum: Items for Sale - New
Topic: JP spot welder
Replies: 1242
Views: 171052

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: 171052

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: 171052

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, ...
by NetPro
Feb 20 2017 9:02am
Forum: Items for Sale - New
Topic: JP spot welder
Replies: 1242
Views: 171052

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: DIY spot-welder, FET-switched, processor-timed adj. pulse
Replies: 611
Views: 61638

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: DIY spot-welder, FET-switched, processor-timed adj. pulse
Replies: 611
Views: 61638

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: DIY spot-welder, FET-switched, processor-timed adj. pulse
Replies: 611
Views: 61638

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: DIY spot-welder, FET-switched, processor-timed adj. pulse
Replies: 611
Views: 61638

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
Mar 15 2016 12:39pm
Forum: Battery Technology
Topic: DIY spot-welder, FET-switched, processor-timed adj. pulse
Replies: 611
Views: 61638

Re: JP spot welder

From the DIY spot welder website Electrical data Weld current: 1100A or 400A Open voltage: 2.6V Mains current during the weld pulse: 14A Quiescent current: 1.6A Maximum welding thickness Light duty portable spot welding guns have a welding current of at least 4000A , which allow welding of 2 x 1mm ...
by NetPro
Mar 05 2016 11:48pm
Forum: Battery Technology
Topic: DIY spot-welder, FET-switched, processor-timed adj. pulse
Replies: 611
Views: 61638

Re: JP spot welder

Thread tl;dr. That was probably me. I bought 4 of these: http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=19153 And the welds were great. Nice, clean, strong nuggets but I haven't build any packs yet. Ran into electrodes problem and haven't had the time to build me a nice set. Ord...
by NetPro
Mar 02 2016 3:58pm
Forum: Battery Technology
Topic: DIY spot-welder, FET-switched, processor-timed adj. pulse
Replies: 611
Views: 61638

Re: JP spot welder

Thread tl;dr. Earlier in the thread someone was gonna use HK Lipo rather then car battery for the welder. Did that work out? What kind of Lipos was in use and how many welds could be done before needing to charge the Lipo? That was probably me. I bought 4 of these: http://www.hobbyking.com/hobbykin...
by NetPro
Feb 14 2016 1:09am
Forum: Battery Technology
Topic: DIY spot-welder, FET-switched, processor-timed adj. pulse
Replies: 611
Views: 61638

Re: JP spot welder

Yes, you won't ever get electrocuted by this welder but there are hazards to be careful of. Always wear eye protection. If the FETs blow, you might have some wires getting really hot, creating a burn/fire hazard. Some kind of slow blow fuse might be a good idea. A fuse is a great idea. What value s...
by NetPro
Feb 12 2016 12:07am
Forum: Battery Technology
Topic: DIY spot-welder, FET-switched, processor-timed adj. pulse
Replies: 611
Views: 61638

Re: JP spot welder

Nice 'scope, okashira. I have been thinking to try one of those software oscilloscopes you install on your PC and connect via the sound card but have not had time to play with that. Wonder if anyone has used one of these to get readings from the welder. I know they have several limitations one of t...
by NetPro
Feb 10 2016 2:07pm
Forum: Battery Technology
Topic: DIY spot-welder, FET-switched, processor-timed adj. pulse
Replies: 611
Views: 61638

Re: JP spot welder

Nice 'scope, okashira. I have been thinking to try one of those software oscilloscopes you install on your PC and connect via the sound card but have not had time to play with that. Wonder if anyone has used one of these to get readings from the welder. I know they have several limitations one of th...
by NetPro
Feb 09 2016 1:15pm
Forum: Battery Technology
Topic: DIY spot-welder, FET-switched, processor-timed adj. pulse
Replies: 611
Views: 61638

Re: JP spot welder

Perfect! This is what I needed to make sure I do it right the first time.
Thank you, okashira :D
by NetPro
Feb 09 2016 12:32pm
Forum: Battery Technology
Topic: DIY spot-welder, FET-switched, processor-timed adj. pulse
Replies: 611
Views: 61638

Re: JP spot welder

While my welder is working fine right now using 0.15mm and 0.2mm nickel strips, just to be prepared for 0.3mm later on (and being the tinkerer I am) I decided to get the diode okashira suggested and it arrived today. http://www.mouser.com/Search/ProductDetail.aspx?R=DSA300I45NAvirtualkey65120000virt...
by NetPro
Feb 03 2016 3:22pm
Forum: Battery Technology
Topic: DIY spot-welder, FET-switched, processor-timed adj. pulse
Replies: 611
Views: 61638

Re: JP spot welder

Can we get some more details on this? I may have to increase my current because I want to weld .3 nickel. If placing a simple diode will help me increase my current without blowing my fets then I will do this. Just need more information about this and if it really works? How much current can you no...