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I always looked up to the spot-welding pros, until I got one myself… turns out with full-auto anyone can do it

Chubby Li~Follow
Creative DIY›Review›U3加强版· BeginnerReport
Adaptive · 1080 / 720 / 480Auto subtitlesPlayback info 00:45
Welding Recipeno level stated on camera
ModelU3pro00:00
ModeFull-auto00:26
MaterialScrew + metal washer (not a battery)00:09

Creator’s own settings as stated in the video (timestamps link to the moment). Not official values — test on scrap first.

Released 2025-07-20ReviewLevel Beginnerdigest confidence 0.75 · pending review

Bill of materials

Welder, accessories, consumables and parts used in this build; quantities and specs are editable Download BOM
AWithZ official
U3加强版 spot welder
×
¥259.9–299.9
WP120 Smart Pen (8 AWG)
×
¥39.9
Nickel-plated steel strip
×
from ¥5.9
Third-party partsFrom the creator’s parts list, grouped by category; links to third-party stores
Screw / washerOther parts · Test weld
×
Third-party

Description

Li Dapang, 44 seconds: with the welder in hand, welding nickel strip is easy; bold idea — put a screw on a washer and spot-weld it, hold it down and it’s welded (a bit hot); ‘no more special welding oil from now on’; ‘with automatic you become a pro instantly’; comments: even 0.2 steel strip won’t weld, a ¥50 thing sold for ¥180, how thick can stacked copper go

Always looked up to the spot-welding pros, until he got one himself — turns out with full-auto anyone can do it. With the welder in hand, welding nickel strip onto lithium cells is already very easy; bold idea: put a screw on a washer and spot-weld it — just hold it down, right? It welded (a bit hot); try another one, hold it down and full-auto fires; no more special welding oil from now on; what else do you think it could do. 37 comments: ‘fake-one-pay-ten, if it works like the video I’ll order ten’ (11); spot-welding sheet iron and stainless has been done before (Li Mutou) (6); ‘no good, my 0.2 steel strip won’t even weld’ (5, creator: with automatic you become a pro instantly); spot welds can’t carry big current, no better than solder, only good for low-power batteries; how thick can stacked copper go; a ¥50 thing sold for ¥180; can it re-tab big prismatic cells.

Outcome

GoalPlaying with the welder: screw welded to a washer
BuildU3 + screw / washer
ResultIt welded · verified on camera: 20–23s ‘it’s welded’, picked up and shown

Steps3 steps · click a frame to jump

  1. 1. Welder in hand, nickel strip is easy; bold idea

    With the welder in hand, welding nickel strip onto lithium cells is very easy; bold idea — put a screw on a washer and give it a try.

    00:00 – 00:14
  2. 2. Hold it down and weld: it’s on (a bit hot); try another

    Just hold it down, right? Look, it welded; a bit hot; try another with this one, hold it down and full-auto fires.

    00:14 – 00:40
  3. 3. No more special welding oil; what else can it do

    No more special welding oil from now on; what else do you think it could do.

    00:40 – 00:45

Bill of materials

AWithZ U3 welder ×1Full-auto · Playing around
Screw / washerTest weld

Creator’s tips

  • In auto mode, hold the pens in contact and it welds; beginners can pick it up 00:26

Pitfalls

  • Comments: 0.2 steel strip won’t weld; can’t carry big current

Li-ion safety

  • The welded part is a bit hot afterwards 00:19
DIY lithium packs can catch fire: check cells for shorts before welding, always add a BMS, never skip insulation and fusing on high-current builds.

Quotes

“I always looked up to the spot-welding pros, until I got one myself… turns out with full-auto anyone can do it!” 00:00
“From now on I can say goodbye to this special welding oil” 00:40

Comments 37· 10 real comments collected

Comment insightsanswered 1 · open 2 · corrections 3

Answered by the creator

Not good, mine can't even do the 0.2 steel strip I bought 5
With auto mode you're a pro in an instant (creator)

Open questions

How thick can it weld stacked copper 1
Can it fit nickel tabs on big prismatic cells

Corrections from viewers

Spot welds can't carry high current, a few small welds are worse than solder, only good for low-power packs 1Doubtful
A ¥50 item sold for 180Doubtful
Someone (Li Mutou) already spot-welded sheet metal and stainless 6Valid
Auto mode0.2 steel stripPriceWeld current capacity
苏
苏N10 mo ago · Jiangsu

Back a ten-for-one guarantee that it works like in the video and I'll order ten

哈
哈哈一族10 mo ago · Zhejiang

Spot-welding sheet metal and stainless, someone's already done it! Li Mutou I think

坏
坏人波哥1 yr ago · Sichuan

Not good, mine can't even do the 0.2 steel strip I bought

李
李大胖~1 yr ago · Shandong

With auto mode you're a pro in an instant

爱
爱的人吧1 yr ago · Zhejiang

Ah, my eyes

儿
儿时回响1 yr ago · Shanghai

I hear spot welds can't carry high current, those few small welds are worse than solder, only good for some low-power batteries

陌
陌染1 yr ago · Hebei

How thick can it weld stacked copper

一
一路晴天1 yr ago · Shandong

Looks like it works well

用
用户12027862706213 mo ago · Inner Mongolia

Could it be any pricier, a ¥50 item for 180

孤
孤单行走人生路1 yr ago · Guangdong

Can this fit nickel tabs on big prismatic cells

苏
苏N10 mo ago · Jiangsu

Back a ten-for-one guarantee that it works like in the video and I'll order ten

哈
哈哈一族10 mo ago · Zhejiang

Spot-welding sheet metal and stainless, someone's already done it! Li Mutou I think

坏
坏人波哥1 yr ago · Sichuan

Not good, mine can't even do the 0.2 steel strip I bought

李
李大胖~1 yr ago · Shandong

With auto mode you're a pro in an instant

爱
爱的人吧1 yr ago · Zhejiang

Ah, my eyes

儿
儿时回响1 yr ago · Shanghai

I hear spot welds can't carry high current, those few small welds are worse than solder, only good for some low-power batteries

陌
陌染1 yr ago · Hebei

How thick can it weld stacked copper

一
一路晴天1 yr ago · Shandong

Looks like it works well

用
用户12027862706213 mo ago · Inner Mongolia

Could it be any pricier, a ¥50 item for 180

孤
孤单行走人生路1 yr ago · Guangdong

Can this fit nickel tabs on big prismatic cells

苏
苏N10 mo ago · Jiangsu

Back a ten-for-one guarantee that it works like in the video and I'll order ten

哈
哈哈一族10 mo ago · Zhejiang

Spot-welding sheet metal and stainless, someone's already done it! Li Mutou I think

坏
坏人波哥1 yr ago · Sichuan

Not good, mine can't even do the 0.2 steel strip I bought

李
李大胖~1 yr ago · Shandong

With auto mode you're a pro in an instant

爱
爱的人吧1 yr ago · Zhejiang

Ah, my eyes

儿
儿时回响1 yr ago · Shanghai

I hear spot welds can't carry high current, those few small welds are worse than solder, only good for some low-power batteries

陌
陌染1 yr ago · Hebei

How thick can it weld stacked copper

一
一路晴天1 yr ago · Shandong

Looks like it works well

用
用户12027862706213 mo ago · Inner Mongolia

Could it be any pricier, a ¥50 item for 180

孤
孤单行走人生路1 yr ago · Guangdong

Can this fit nickel tabs on big prismatic cells

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