Building a Spot Welder from a Microwave!?

Here are links for the primary parts used in this video:
► Spot welder pen: amzn.to/45BTTqk (Amazon)
► Capacitive buttons: amzn.to/3MaxqtF (Amazon)
► Arduino nano: amzn.to/45BBzgY (Amazon)
Support me for more videos: / electroniclab
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[@gearscodeandfire]

Just discovered your stuff, really like it, keep it up I'm gonna go build one of the spot welders now

[@yossieidlisz]

Yanky I enjoyed watching what u did,keep up ur amazing talent

[@ElectronicLab.]

Thanks

[@anukeshambatkar6255]

Hi @ElectonicLab, for 25 sq.mm wire, how many turns you wound as secondary ?

[@anukeshambatkar6255]

I am also facing same issue, nickel strip is not weld properly on lithium cell

[@ElectronicLab.]

What material are you using for the spot welding tips?

[@anukeshambatkar6255]

I am using similar spot welding pen made of copper

[@ElectronicLab.]

Are you using a relay or solid state relay?

[@anukeshambatkar6255]

@@ElectronicLab. no I am using 5 BTA41-600B TRIAC in parallel as a switch

[@leoparddiy]

Good video, thanks🙏

[@tuankietduong3646]

does that use 220v or 110v?

[@ElectronicLab.]

110v

[@esqueue]

How many wraps with the new thicker wire? I made one a few years ago but it uses a rotary encoder as a selector and it sends a double pulse. The problem I have is that it can easily blow a hole in my batteries if tension isn't really hard and lately I've been having issues even getting the welds to stick. I don't know if it's my nickel strips or do I need to really clean the cells before hand or do I even need to resharpen the electrodes.

[@ElectronicLab.]

@esqueue I ended up using 4awg copper stranded wire and made 3 turns as the secondary coil. But what is also important to get good welds, is to strictly use copper electrodes, use a relay at the 120volt primary coil and not a solid state relay, and yes sharper electrodes will give you better penetration with less power or shorter pulse time and talking about pulse time, make sure to have proper pulse length, between 10ms and 300ms should be plenty range. Cleaningwise, I don't go crazy, I just use a Dremel to flatten the surface from the old nickel strips if the cells are salvaged (I do recommend using a Dremel if everything fails). I also recommend getting the electrodes I used (linked in the videos description) because it has a pressure switch that closes at a certain pressure, which should give you consistent welds.

[@esqueue]

@@ElectronicLab. thanks

[@ElectronicLab.]

You're welcome!

[@SimonsSolarShed]

Hi i enjoyed your video. Im also building a spot welder using an arduino nano and oled screen the same as yours.can i ask where you got the code as its exacly what i need given that you have the same build as me the only real difference is im using a solid state relay.is there any chance you could give me a link to the code you used please? Keep up the great work i thoroughly enjoyed your project. Simon.

[@ElectronicLab.]

Thank you. I didn't put the code on a website, but here it is: int plusPin; int minusPin; int triggerPin; int relay=8; int buzzer=10; int pulseTime; int triggerVal; int pulseDelay=200; #include #include #include #include #define screen_width 128 // OLED display width, in pixels #define screen_height 64 // OLED display height, in pixels // display wiring = A4(SDA), A5(SCL) Adafruit_SSD1306 display(screen_width, screen_height); void setup() { // put your setup code here, to run once: pinMode(2,INPUT); pinMode(4,INPUT); pinMode(6,INPUT_PULLUP); pinMode(relay,OUTPUT); pinMode(buzzer,OUTPUT); pulseTime = EEPROM.read(0); display.begin(SSD1306_SWITCHCAPVCC, 0x3c); } void loop() { // put your main code here, to run repeatedly: plusPin=digitalRead(2); //digital pin 2 is for the plus button minusPin=digitalRead(4); //digital pin 4 is for the minus button triggerPin=digitalRead(6); //digital pin 6 is for the trigger button EEPROM.write(0,pulseTime); if(plusPin==1){ pulseTime=pulseTime+5; delay(pulseDelay); } if(minusPin==1){ pulseTime=pulseTime-5; delay(pulseDelay); } if(pulseTime255){ pulseTime=255; } if(triggerPin==0&&triggerVal==0){ digitalWrite(relay,1); digitalWrite(buzzer,1); delay(pulseTime); digitalWrite(relay,0); digitalWrite(buzzer,0); triggerVal=1; } if(triggerPin==1){ triggerVal=0; } display.clearDisplay(); display.setTextSize(4); display.setTextColor(SSD1306_WHITE); display.setCursor(0, 17); display.print("ms"); display.setTextSize(4); display.setTextColor(SSD1306_WHITE); display.setCursor(55, 17); display.print(pulseTime); display.display(); }

[@SimonsSolarShed]

@ElectronicLab. you sir are an absolute legend :) I have been looking for code suitable for quite some time, you have just ended my search 😀 appreciate you taking the time to help me thank you 👍

[@ElectronicLab.]

You're welcome

[@SimonsSolarShed]

Hi thank you for the code although it don't seem to work at present I'm getting errors do you have a picture of how the code looks when it's put onto the ide program I think I'm getting the code mixed up void setup,loop any help would be most appreciated.kindest regards Simon.

[@ElectronicLab.]

When you put the code in the IDE, you have to delete the original setup and loop since my code already comes with it. Also, what does it say on the error message?