For what it's worth - suggest you do not file the electrodes to a sharp point like you have but rather slightly dome the points with an angled semi-rounded circumference and a small flat section on the very top and use the top edge of the electrode for the weld (not the very top)! You are asking a lot of the welder to try and successfully weld through the tiny pointed top resulting in a huge current density transferred through this point with the result that you will get crappy welds every time! Cheers

This was awesome, Steven! I just purchased "The Winner".

@sleonard2649

3 жыл бұрын

Would a 14.8V 850mAh 4S 80C Lipo Battery work? Don't want to spend too much since I have no other use for it.

@yuutoshifune837

3 жыл бұрын

@@sleonard2649 you might blow it with a 4s battery

Have you tried the spotwelder that you connect to a modified microwave power supply. They're very cheap and they have a display

The soldering machine acts as a timer and current limiter. It has nowhere to bring more amps than the source gives. Soldering is done by the battery amperage. That's why it works very well with car batteries, which have high short-circuit amperage.

If you can modified your BIFRC you can weld from 0.1mm up to 0.3mm nickel strip. I have one BIFRC same as the youtuber own and can weld 0.3mm firmly

Adding a capacitor to the BIFRC does not make any difference as it’s connected across the battery and is not isolated by a diode. I think the sellers have seen people adding capacitors to other welders and decided to supply one without understanding its benefit.

Leave the sticker on the speaker, then the volume will be really now, and actually really nice to have ;) Niec vid!

Just a couple of points about the BIFRC unit. 1) The pens are total garbage. I ordered one without the pens and was trying to find the size of the stock welding cables. Took hours but I finally found it: 10 AWG (approx 2.5 mm diameter). 2) That 'extra capacitor' that is supposed to be soldered across the input power is 2200uF 25 volts. This is to help prevent the input voltage from sagging below 8 volts and blowing the mosfets. 3) Power supply voltage: 12V-16.8V with with burst of 150-200 Amps without the voltage sagging below 8 volts (better yet not less than 9). 4) Adding the heat sink is a GREAT idea. Steven's follow up video on the BIFRC: kzread.info/dash/bejne/q61-vKizfNG5d6g.html

Thanks for the testing series! You are not using the standard tips right? Where did you get them or did you make them yourself? :)

@stevenc22

3 жыл бұрын

10awg wire with 8 awg solid wire tips. I have some solid wire left over from my powerwall bus bars and I use those as tips

wow bifrc with heatsink , please how to :)

Looking forward to part 4... Lol

You should reduce the length of the cables from the spot welder to the battery. And try with 2 lipos in parallel, it will be much stronger. I use 2x 4s lipo 5000mah in parallel, it is very powerfull.

@stevenc22

3 жыл бұрын

Im very happy with the winner spot welder. It's great 👍

@SebVsR

3 жыл бұрын

@@stevenc22 ok, but try with 2 lipos in parallel, you will see a big difference. I can spot 2 pieces of 0.15mm nickel strip easily with a very basic pcb card. € 11,39 24%OFF | Soudeurs par points portatifs de dispositif de soudure de carte PCB de stockage de batterie de Machine de soudage par points de bricolage 12V pour 18650 26650 a.aliexpress.com/_vN47YB I have the type 3, works great.

Hi, does the runner up one (red/black pcb) has burnt-out mosfets issue if the power source can't give enough current during welds, just like the model which has LCD display on it?

@stevenc22

3 жыл бұрын

Could be, i don't know. My Lipo batteries deliver plenty of current and i havent had any problems with mosfets not closing and burning out.

@radius.indrawan

3 жыл бұрын

@@stevenc22 thank you.

Hello do you have a link to the spotwelderboard that you blew up and got a replacement? Regards

@stevenc22

2 жыл бұрын

Can't find it anymore

I tried to do spot welding on 18650 battery, but the the current is very week and didn’t weld. I have the same smaller board with 5 misfit.

@stevenc22

3 жыл бұрын

You need a 200+ amp battery to really weld well

Heads up anyone watching this video, there's a new cheap "intelligent" PCB spot welder (or at least I think it's new because I haven't seen it before or seen any reviews) that blows the beloved BIFRC out of the water. It's available on most direct from China websites (Banggood, AliExpress, Walmart, etc) but hard to find when you search PCB spot welder because it seems to be quite far down the list (for me anyway). The model number on the PCB is JQ-DHJ02B and it's a green PCB with buttons to select the Ah and discharge current of your battery as well as a gear/power button and an on/off button. The best part is it claims to be "intelligent" and will not allow spot welds if your battery is too weak or too powerful, therefore saving the MOSFETs from exploding like they do on pretty much all other PCB spot welders. I haven't killed it yet so the intelligent part must be working as claimed. I managed to weld 2x0.15mm nickel strips and 1x0.10mm nickel strongly together with just ONE weld (three overlapping strips with one weld) using a 6000mAh 80c Zeee Power LiPo battery with the relatively crappy included welding pens. I have been comparing the JQ-DHJ02B to the same BIFRC welder that @Stevenc22 outlines in this video (with the wall power mod) and from my experience, the JQ-DHJ02B welds stronger and stays much cooler to the touch than the BIFRC. The only downside is the instructions and some of the PCB labels are Chinese only, but it's not too hard to work out without instructions anyway. TL;DR - Look up JQ-DHJ02B PCB Spot welder on google and buy that one instead of the BIFRC. It's SO MUCH better.

@user-2uf2kr2c

2 жыл бұрын

Do you have a link to it or at least a picture ..? Thx

@user-2uf2kr2c

2 жыл бұрын

Hello, maybe you can add a link? Regards

hi, would this work with a smallish 400cca car battery?? thanks for your time.

@stevenc22

3 жыл бұрын

400cca is perfect

@alanreynolds2125

3 жыл бұрын

@@stevenc22 thank you, regards alan.

Great video series, thanks for the effort! Do you think the boards could handle 4s?

@stevenc22

3 жыл бұрын

Probably not. But the voltage isn't important, it's the amps

@dontdiediy7630

3 жыл бұрын

@@stevenc22 Was thinking if the control electronics would frie at 4x4.2v=16.8v. It's common battery voltage for drones, so I have a bunch of them. I've ordered the "winner" now, and it says it can handle 16.8v in the description. Also mentions a min current of 160A

First one the winner i got one from Ebay welded twice then got stuck open both leds on ,they send me a new one i made sure i did all good ,but after 2 welds same thing- dont see burn mosfets , happened to some other ppl. so i am back to my big one what i made from ebay pcb n microwawe transformer works good its just little bigger. winner winner chicken dinner.

@stevenc22

3 жыл бұрын

There are knock off's of the winner. Make sure it was an actual BIFRC

@vavo9269

2 жыл бұрын

can such pcb be used with microwave transformer?

What’s actually the reason you’r not using the capacitor that’s provided? And you have a link of the heat sink? (Can’t find the dimensions of the product) And what is the plastic for? To isolate the back?

@stevenc22

3 жыл бұрын

No capacitor provided. And yes the tape is to stop accidental short circuit.

@stevenc22

3 жыл бұрын

www.ebay.com/itm/Lot-of-8pcs-Aluminum-Memory-Chipset-Heatsinks-14mm-x-14mm-x-6mm-/391835176432?_trksid=p2349624.m46890.l49292

@Diown

3 жыл бұрын

Oh that’s funny that you didn’t get a capacitor. What would be the benefit of a capacitor in this situation? Or would you suggest not using it?

@stevenc22

3 жыл бұрын

@@Diown that board was originally designed for super capacitors. But then they started selling them for use with batteries. Super capacitors are very powerful but so is the lipo I was using. I don't know why it didn't do better. It just sucked in the end.

@Diown

3 жыл бұрын

@@stevenc22 And I see other people beefing up the solder leads on the back (some even add copper wire) would you think that’s necessary or with the heat sinks it’s already good enough? Are the tips still getting hot after using heat sinks? And using 4x 3s 450mah 70/160c in a parallel board should work also right? Should be around 200A right?

I didn't see the red Chinese one

Which one is the best?? Bup them with number 1 to ....

@stevenc22

Жыл бұрын

Easily the BIFRC. My favorite and longest lasting spot welder.

Do you have a link to the needles you use?

@stevenc22

3 жыл бұрын

I made them my self with some 10awg wire and some copper

@ligi8588

3 жыл бұрын

@@stevenc22 Thank you very much for the information! So you get some copper rods and sharpen the tip? Can I ask which diameter of rod you use? Thanks for your works - just ordered the PCB (without needles so far) - looking forward to create some batteries for: ligi.de/bike

@stevenc22

3 жыл бұрын

@@ligi8588 Yes. I used 10 AWG cable with 8 AWG solid copper ground wire tips. www.homedepot.com/p/Southwire-25-ft-8-Gauge-Solid-SD-Bare-Copper-Grounding-Wire-10632883/301096486

@ligi8588

3 жыл бұрын

@@stevenc22 thanks again!

FYI: one can also get thicker pure nickel strips = 0.20mm

@ed-jf3xh

3 жыл бұрын

Even 0.3mm

You did not mentioned in any of your videos that " the winner" needs some modification to work properly (nor any of the other spot welders).However there are not a small number of reviews that people are complaining on blown mosfets and giving modifications that had to be made for spot welder to work properly.What is your opinion on this mater and does "the winner" works right out of the box? Thank you in advance.

@stevenc22

3 жыл бұрын

Mine works great. No modifications. I think the trick is to have a really powerful battery. Too many people use a weak battery that the voltage sags and then the mosfets get stuck open. That is why people add a capacitor to help stop voltage sag.

@vavo9269

2 жыл бұрын

@@stevenc22 can this be fixed with the mod of external power supply from wall you did with dc 12v adapter? and would that mod work on all those boards?

@stevenc22

2 жыл бұрын

@@vavo9269 Yes theoretically it would work on any spot welder PCB. However some of these spot welders just suck and moding them wont make them better. I would only consider the winners.

hi, sorry to be a pain, my BFRC welder has arrived but has come with a capacitor and no instruction can you help me please???? regards alan.

@stevenc22

3 жыл бұрын

Sure but mine didn't not come with a capacitor. Got pictures of your board?

@stevenc22

3 жыл бұрын

[US$9.99 29% OFF]18650 Portable 12V Lithium Battery Storage Spot Welder Soldering Machine PCB Circuit Board and Spot Welding Pen Needle Module Board from Electronic Components & Supplies on banggood banggood.app.link/EUgpfMBPDdb

@stevenc22

3 жыл бұрын

Look here in the customer review section. The capacitor gets soldered on the underside on the main positive and negative. Apparently the capacitor is now added to help the mosfets last longer.

@alanreynolds2125

3 жыл бұрын

@@stevenc22 thanks for your time steve, I guess the cap has a + and - leg then? sorry to sound thick!! cheers alan.

@stevenc22

3 жыл бұрын

@@alanreynolds2125 longer leg is positive. Plus the cap has a yellow line on side which shows the negative

Amazon and eBay links for your top 2? Can’t wait 30 days China slow boat. Want from US warehouse.

@stevenc22

Жыл бұрын

The PCB by itself is not available on amazon, but the updated version is. amzn.to/3wGuSvD

@christothegreat1

Жыл бұрын

@@stevenc22 thanks. That’s double price! Prefer the $20 version that connect to 12V car battery? In case it blows up, as they often do., less of a loss to replace…

@stevenc22

Жыл бұрын

@@christothegreat1 correct. But you will have to order from China. I cannot find a cheap ones locally on Amazon.

Er