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Episode 183 | When you want nothing and nothing matters, what do you do? Keep sinking, or look for something that makes you happy and try to cheer up! Life is just an experience — make sure you enjoy it

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Welder reviews›Review›UF20B· ProfessionalReport
Adaptive · 480Auto subtitlesPlayback info 03:00
Welding Recipe
ModelUF20B (upgraded to the No. 6 welding pen)02:30
Gear2000:28When welding idly
MaterialStacked combinations: 0.15 nickel-plated + 0.1 copper + 0.15 nickel-plated; 0.1 nickel-plated + 0.15 copper + 0.1 nickel-plated; 0.15 nickel + 0.15 copper (thinner top layer)01:10
Strip thickness0.15 mm01:10
Copper strip thickness0.15 mm01:35Copper ceiling (tested by the creator)
Follower’s failed combination: 0.2 nickel + 0.15 copper (Xianyu unit)00:28
Comment: 0.15 copper stacked on 0.15 nickel-plated on a 21700, no problem

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

Released 2026-01-12ReviewLevel Professionaldigest confidence 0.8

Bill of materials

Welder, accessories, consumables and parts used in this build; quantities and specs are editable Download BOM
AWithZ official
UF20B spot welder
×
¥569.9–599.9
WP120 Smart Pen (8 AWG)
×
¥39.9
Nickel-plated steel strip
×
from ¥5.9
Copper strip
×
See store
Flux
×
¥13.9

Description

Lefeng rambles: no interest in anything except the spot welder (charges fast, 20 gears, welds whatever); replies to a follower whose “same model” can’t weld 0.2 nickel + 0.15 copper — that one was bought on Xianyu; his own storefront unit, tested himself: 0.15 nickel-plated base + 0.1 copper + 0.15 nickel-plated, or 0.1 base + 0.15 copper + 0.1, both fine; a single bridge of 0.15 nickel + 0.15 copper with a slightly thinner top layer also works; needs the No. 6 welding pen upgrade; don’t ask me about units bought elsewhere

Opens musing that he wants nothing; the only thing he still enjoys is coming back to mess with this pile of stuff — the spot welder charges fast, full in no time, 20 gears. A follower earlier asked why the same spot welder couldn’t weld 0.2 nickel strip plus 0.15 copper; turned out it wasn’t bought from the storefront but on Xianyu; told him to swap either the 0.2 nickel strip or the 0.15 copper. The one in my storefront I verified myself: 0.15 nickel-plated steel strip as the base, 0.1 copper strip stacked in the middle, another 0.15 nickel-plated steel strip on top, no problem; a follower used 0.1 nickel-plated as the base, 0.15 copper stacked, 0.1 nickel-plated on top, also no problem; I myself, on a single bridge, 0.15 nickel strip base + 0.15 copper sheet, with the top layer slightly thinner, also no problem. I’m not asking you to buy from my storefront, but the data I tested is only for the storefront unit; if you buy it and it doesn’t deliver, come and yell at me (you do have to upgrade to the No. 6 welding pen); don’t ask me about the settings of units bought elsewhere, I don’t know. I just like doing a couple of welds when I’m idle, I like welding, not sure whether that’s a weird fetish. Comments: this welder is good, 0.15 copper stacked on 0.15 nickel-plated on a 21700 no problem, haven’t tried Jiashikai; careful, your little wife will grab you by the ear.

Outcome

GoalAnswer a follower’s stacked-weld settings question; rambling
BuildUF20B (No. 6 pen upgrade) stacked-weld combinations
ResultThree stacked-weld combinations that he tested and found workable · verified on camera: 70–123s combinations described as tested by himself

Steps5 steps · click a frame to jump

  1. 1. Wants nothing, only the spot welder interests him; charges fast, 20 gears

    No interest in anything; the only interest is messing with this stuff; charges fast, full in no time; 20 gears.

    00:00 – 00:30
  2. 2. Follower’s “same model” can’t weld 0.2 nickel + 0.15 copper → bought on Xianyu

    A follower asks why the same spot welder can’t weld 0.2 nickel strip plus 0.15 copper; not bought from the storefront, bought on Xianyu; told him to swap the 0.2 nickel or the 0.15 copper.

    00:30 – 01:10
  3. 3. Tested combinations that work: 0.15 nickel / 0.1 copper / 0.15 nickel; 0.1 nickel / 0.15 copper / 0.1 nickel; 0.15 nickel + 0.15 copper

    Storefront unit, tested himself, 0.15 nickel-plated base + 0.1 copper + 0.15 nickel-plated, no problem; a follower’s 0.1 base + 0.15 copper + 0.1 also no problem; a single bridge of 0.15 nickel base + 0.15 copper with a slightly thinner top layer also no problem.

    01:10 – 02:05
  4. 4. Only vouches for the storefront unit; needs the No. 6 pen upgrade; don’t ask about units bought elsewhere

    Not asking you to buy from my storefront, but the data tested is for the storefront unit; buy it and it falls short, yell at me, though you do have to upgrade to the No. 6 welding pen; don’t ask me about settings for units bought elsewhere.

    02:06 – 02:44
  5. 5. Just likes doing a couple of welds when idle

    No interest in anything else, a bit of interest in this, likes welding, weird fetish.

    02:45 – 03:00

Bill of materials

AWithZ UF20B + No. 6 welding pen ×1Stacked welds
Nickel-plated steel strip 0.1/0.15, copper 0.1/0.15Stacked-weld combinations

Creator’s tips

  • For stacked copper, use nickel-plated as the base, copper in the middle and nickel-plated on top; make the top layer slightly thinner than the base 01:10
  • 0.2 nickel + 0.15 copper is beyond this unit; switch to the 0.15/0.1 combinations 00:56
  • Upgrade to the No. 6 welding pen before discussing stacked-copper settings 02:30

Pitfalls

  • Settings on a unit bought through unofficial channels (Xianyu) can’t be guaranteed 00:42

Li-ion safety

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

“If the one you bought from my storefront doesn’t do what I said, you can come and yell at me — you do have to upgrade to the No. 6 welding pen, of course” 02:17
“I just like doing a couple of welds when I’m idle — not sure whether that’s some weird fetish of mine” 02:50

Comments 19· 4 real comments collected

瑶
瑶7 mo ago · Guangdong

Careful your little wife grabs your ear — no interest in her, only the spot welder left

@
@贝吉塔大王7 mo ago · Jiangxi

Delivering food is just to kill time, used to make ¥50k a day. Big ups and downs.

人
人间别久不成悲7 mo ago · Hunan

Keep up the abstinence, I like watching

立
立哥在奔跑……7 mo ago · Guangdong

This welder really is decent! 0.15 copper stacked on 0.15 nickel-plated, 21700 no problem, haven’t tried Jiashikai yet

立
立哥在奔跑……7 mo ago · Guangdong

This welder really is decent! 0.15 copper stacked on 0.15 nickel-plated, 21700 no problem, haven’t tried Jiashikai yet

瑶
瑶7 mo ago · Guangdong

Careful your little wife grabs your ear — no interest in her, only the spot welder left

@
@贝吉塔大王7 mo ago · Jiangxi

Delivering food is just to kill time, used to make ¥50k a day. Big ups and downs.

人
人间别久不成悲7 mo ago · Hunan

Keep up the abstinence, I like watching

瑶
瑶7 mo ago · Guangdong

Careful your little wife grabs your ear — no interest in her, only the spot welder left

@
@贝吉塔大王7 mo ago · Jiangxi

Delivering food is just to kill time, used to make ¥50k a day. Big ups and downs.

人
人间别久不成悲7 mo ago · Hunan

Keep up the abstinence, I like watching

立
立哥在奔跑……7 mo ago · Guangdong

This welder really is decent! 0.15 copper stacked on 0.15 nickel-plated, 21700 no problem, haven’t tried Jiashikai yet