NEW DIY SPOT WELDER - BEST YET?

[@chrisb9841]

Well done, Steven! Helped me a lot in making a decision.

[@ericklein5097]

Thanks for the suggestion on this one. Blown away by how good it is. No more powerbank style/built in lipo spot welders. I'm using just 1/3 of a 12S8P A123 pack (very good condition probably barely cycled) so I have an IR of like 4.2mΩ on the whole 12V pack that I'm using. I put it on the second capacity setting since its about 19.75Ah and then I think I go up to about 30C. I"m getting solid welds on 0.20x8mm pure nickel and honestly I think it might have the juice to do 0.30mm pure nickel if I paralleled another 12V pack of 4S8P of A123 ANR26650M1B cells.

[@stevenc22]

Awesome!

[@ericklein5097]

@@stevenc22 well....I only had 7 Headway 38120HP cells left after I accidentally killed one so I built a 3S2P Headway pack and then just used one less series group on one of my A123 4S8P M1B packs so it would be a 3S8P..... Lets just say after reviewing the instructions and and the chart for the Ah/C rate.....I had a 36Ah and I've been using 20C-30C and I'd guess its probably much closer to 30C than 20C because....at 1080A I blew her up....which...ya know its rated at 900A The traces seem to be incredibly delicate or I really just gave her way too much juice. I also blew one of the fets but that seems to be a result of some traces going first and where I still had good traces is where I blew a fet. Just a massive crater in the fet. I desoldered it and I might try to repair the board by replacing all the fets with IRL40SC228's since that's what I have laying around right now.

[@johanakerblad339]

Translation of Chinese text at power switch ( bottom to top diodes):ON/OFF, power on indicator, battery low power,battery over power. Many thanks for your presentation!

[@Milkybar3320011]

I’ve taken the plunge and ordered one with a similar battery, I’ll let you know how it works out.

[@g.f.beurling727]

Steven, what a neat review! I had just bought this & received it a couple of days ago, but haven'y yet tried it. Your review will be very helpful to any potenttial buyers, being that there is hardly any feedback available about this unit, and I took my chances when I bought it. Your review is the first I've found, and it is inspiring.

[@stevenc22]

Thanks. Good luck with the new spot welder. Make sure you have a good battery to power it.

[@az9094]

awesome tutorial! I got one to try along with a 80C battery at 16V. Set to 5ah and 40C and 2nd gear. I get a beep and no weld. Soon as I bring the needles together and BEEP. adjusting settings didn't help. Tried another one with different batteries. Lots of beeps and no welds. Really jealous of how anyone here got this working!

[@SbangFPV]

Thank you for your great research Steven. Can nickel be replaced with copper?

[@stevenc22]

In theory yes, but getting really thin copper can be hard. Nickle is good enough for most batteries

[@SbangFPV]

@ I see. Currently I’ve got 0.2mm & 0.4mm Cu strips. For 21700

[@stevenc22]

@@SbangFPV 0.4mm is really thick for a diy spot welder to penetrate

[@SbangFPV]

@ yes that’s what I was thinking too. God thing I got the 0.2mm. I’ll try to thin the.4mm down to .3 or .25mm. For minimum resistance

[@bvmalukqat9545]

Hello, I bought one of these based on this excellent review (V1.4). I am quite happy and even can weld a copper nickel sandwich. 0.1 mm Plated Nickel with 0.1mm Copper. I do that at 14.8V - 2nd setting - and measure 900-1000A current. I use 4 very old (> 10years) 5000hAh 45-90C batteries in parrallel. Before pushing the JQ-DHJ02 even futher I have to install first some TVS diodes for surge protection (probably the 1.5KE18A ) Any way the question I have: Is it possible to operate this board with a foot switch? Thanks

[@stevenc22]

Im glad you like the spot welder!

[@1RAYGC]

What is "gear"? Is that like duration of applied current?

[@stevenc22]

Yes I think so. Higher gear is a better /stronger weld

[@rocheuro]

quick question - an aircraft - 3s 11.1V lipo battery with 100C rating (but only 1550mAh) will work fine? it should give 155Amps. it has only 5 ohm resistance per cell.. so it should be able to give high bursts of current. any ideas will this work fine?

[@stevenc22]

Maybe. I really think you need more than 100amps to weld well.

[@ericklein5097]

triple that for bare minimum

[@CalPil0t]

From the front cover of the manual that he shows at beginning: DHJ-02B.

[@catalin_chiriac]

Hello.Can you help me with a code for the 6 pin part that is near ca litle coil L1 that is also near the P- ?

[@jevgenie7094]

Hi do you use steel with nickel or pure nickel ?

[@stevenc22]

Pure nickel

[@eddiebrandrick4374]

What is the name of this spot welder or a link to purchase it. Like you I find the BRFC can be inconsistent with blow outs but still a great spot welder.

[@CalPil0t]

DHJ-02B

[@stevenc22]

Links in description

[@bobravenscraft5376]

Lightly scuffing cell ends amazing difference

[@drmachinewerke1]

No notification received. Can you use one of the spot welding pens ? with it

[@stevenc22]

Yes I think you could.

[@erreib]

I purchased the same spot welder and battery but I can't get this unit to detect when I am placing the needles, after I set my settings I just hear the indicator beep occasionally go off randomly, but never when I make contact with the nickel. Do you have any ideas? I was also using the bifrc spot welder with the same battery and that worked well until it I overworked it causing it to overheat and stop sending a pulse.

[@stevenc22]

Sorry it might just be defective

[@g.f.beurling727]

Steven, by the way..... I intend to use my car battery with its 625 CCA rating to power this unit. Do you have any advice or opinion which setting on this device I should start with? I really haven't any idea how the 625 cold-cranking-amps of my car battery translates to the c-rating of a lipo battery, and so don't know what c-rate setting to set it at.

[@stevenc22]

A car battery has a capacity of about 50ah. So your battery has about a 10c-15c rating

[@E-BikingAdventures]

Are boards like these able to opperate off of 1s? ie 3.7 volt battery bank?

[@stevenc22]

No. They are designed for 12v

[@TC-hl1ws]

I have the BIFRC welder and am going to buy this new model. The new model needs a name! Has your BIFRC been working better with the addition of the AC 12V converter?

[@stevenc22]

My BIFRC has always worked well. Sometimes it's a little inconsistent but I have built multiple batteries with it no problems. This new spot welder seems more consistent.

[@waynegabler6570]

I'm switching from sla batteries (12v x 5) to 26650 cells in the original cases. That is 16 cells / case. I can solder nickle OK, I suck at batteries. In my case, I have a 110v mig welder I could use for power (or sla batteries) From the vids I have watched on 'spot welders' not many promote the end be 'flat' when in contact with the nickle strip. In my case, I would prefer to 'ground the nickle strip to a clamp' and then use a single probe as the 'contact'. 4 spots would be 4 different touches and the ground would not be moved. Alternatively, the negative side would have a probe 4x the size of the contact probe. I would prefer to spot weld a tab of nickle and then solder the rest as the bike would be a 'high vibration' zone. (or spot weld the cells and then add a dab of solder on an edge or a hole in the middle) If I find a small dia tip is perfect for a single thin strip, would that mean the same timer would work for thicker material if the dia of the probe was larger. Sparky

[@stevenc22]

Please don't use a mig welder on batteries.

[@waynegabler6570]

@@stevenc22 I can tap into the power supply without using the 'wire feed' part. It would be used for power on a mini spot welder. 13 to 15 volts or 15 to 17 volts

[@stevenc22]

Don't do that. A lipo battery is $30 and delivers all the amps you need.

[@MrDexi87]

Please do video vs BIFRC :)

[@quyrong852]

Can we use supercapacitor for this board ? Thanks

[@stevenc22]

I'm not sure. Check the AliExpress link and see if the description says it can be used for super capacitor.

[@francisconotengo3477]

Hi, I use my unit with 2 supercapacitors in paralel 2.85v and 3000F each one, the only think is you need an external power source from 1 to 2 amps and 12v for power on your spot welder

[@quyrong852]

@@francisconotengo3477 Please kindly show me how to do. It would be better if there is some picture attached. Thank you in advance

[@ericklein5097]

@@quyrong852 are you serious?

[@ttttenney]

Excellent review, and like you I've had great success using the BIRFC welder w/o the inconsistencies you talked about. I'm wondering if that's because I'm using the capacitor that came with it, providing a more consistent current hit? I'll switch to this one if ever my BIRFC goes bad, which so far has been nothing but reliable.

[@stevenc22]

I love my BIRFC!

[@francisconotengo3477]

very good quality spot welder, for the price is great deal....I have my unit too :D

[@anthony1113]

Would be really cool to 3D print a case for them and add some active cooling fans

[@stevenc22]

Agreed. I don't like have so much exposed circuitry, easy to drop some nickel on them and short the spot welder!

[@kennymarto1316]

Will this work with a 12v dc power supply?

[@stevenc22]

Yes

[@beevo5359]

@@stevenc22 which 12v DC power adapter with how ampe, 12v-2A...12V-5A or higher? can used

[@stevenc22]

Sorry. I got confused which video you were asking about. This will never work with a 12v DC supply. This needs 200+ amps to weld which you cannot get from a power supply. You will have to use a battery

[@beevo5359]

@@stevenc22 can i use a lipo 3s 3000mAh 45c or 60c for it? or need lipo 3s 5200mAh 80c i click your link aliexpress, but they don't have version 1.2, just a version 1.0

[@stevenc22]

3000mah x 60c = 180 amps. That should just about be powerful enough.

[@nnpha0167]

Interesting device... I see that your location is in the USA. However, the accent makes me think of a southern hemisphere country...? Please ignore if this is inappropriate.

[@stevenc22]

Born and raised in South Africa

[@93556108]

FYI your given links to spot welder doesn't work. Appreciate your verification. Thank you.

[@stevenc22]

Yeah spot welders change all the time. Check my newer spot welder videos. I have found some better spot welders. Look at this one. kzbin.info/www/bejne/ZmqnZ6VnipaZZ68

[@JDthevandwellingpro]

This thing SUCKED!!!! I TESTEDNIT 2X. first time it didn't work so good. 2nd test it worked very well. Was able to weld .2 tin strips. Then it was time to finish my pack and it wouldn't weld anything together. Not even the cheap fake tin strip that came with it. AND The plastic part of the power button popped off all by itself. I was trying to weld and not even touching & pop it flew over my head somewhere never to be seen again. It's not convenient to return things to amazon for me so I'm stuck with this inoperable trash ! Very disappointed! Now I'm not gonna have my bird working for the ESK8 convention in Las Vegas next week!!!! SOBYEAHBIM PISSED! DO NOT BUY THIS!!!