Timeline for Prevent a power bank welder from short circuiting
Current License: CC BY-SA 3.0
19 events
| when toggle format | what | by | license | comment | |
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| Jul 14, 2016 at 20:14 | history | edited | user105652 | CC BY-SA 3.0 |
Organized into numbered paragraphs. Corrected poor grammar. Deleted trailing 'Thank-you'. Corrected minor typo's.
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| Jul 14, 2016 at 20:03 | comment | added | user100476 | I believe I have I capacitor that runs 240 volt and around 1F...that capacity seems a bit high maybe it was lower, its been to long | |
| Jul 14, 2016 at 20:02 | comment | added | user100476 | What if u put 4 high load diode's in the square thing (forgot what its called) wouldn't that smooth out the current and kinds "regulate " the current? Or a microwave capacitor in it along with the 10k ohm resistor. | |
| Jul 14, 2016 at 19:56 | comment | added | user100476 | What rods were u using | |
| Jul 14, 2016 at 19:26 | comment | added | HandyHowie | I have modified a mig welder to run off 2 12v car batteries in series using 0.8mm mig wire. I initially tried using 12v, but it didn't get enough heat to penetrate the steel enough to do a good job. 24v on the other hand works very well. See - handyhowie.co.uk/handyhowie/Battery_Mig_Welder.html | |
| Jul 14, 2016 at 17:51 | comment | added | KalleMP | These people have made something similar. They use big batteries that do not usually self-destruct when abused. - readywelder.com | |
| Jul 14, 2016 at 17:50 | comment | added | user57037 | In order to add current control, you need a 10A (or maybe variable) switch-mode current source. This would essentially be a buck regulator with current sense output. Not sure how well it would hold up if used for welding. There are a number of flaws in your estimation of battery capacity. If it is truly not listed on the battery (which is VERY unusual) then you will need to measure it by discharging the battery into a known load until it is dead. If the load is a resistor, you will need to measure voltage periodically during discharge. | |
| Jul 14, 2016 at 16:50 | comment | added | user100476 | Ok I just ran the numbers on the cells, the max is 16 volt about 17 A and 17 Ah. This is just rounding it off .so if I resist the current to 12 amp I would get over a 30 minutes of welding before the cells get to low, am I right? | |
| Jul 14, 2016 at 16:34 | history | edited | user100476 | CC BY-SA 3.0 |
added 1 character in body
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| Jul 14, 2016 at 16:34 | comment | added | user100476 | I'm sorry that I can't get exact measurements | |
| Jul 14, 2016 at 16:33 | comment | added | user100476 | Ok well I charged it with a 12v 950ah charger for about 12 hours. So it has about 12 amp plus the charge that was already in it, but the cells had no sign of heating so I believe that they will hold mor charger but I will have to buy a tester to be safe. I have been using these cells to power a foam cutter made out of 40 g nicromide wire witch has a resistance of 68ohm. I powered it for about 30 minutes straight and there was no sign of heating on the batteries or the copper leads, and there was no noticeable different in the power of it so I believe there is enough capacity. | |
| Jul 14, 2016 at 16:29 | answer | added | WhatRoughBeast | timeline score: 1 | |
| Jul 14, 2016 at 16:26 | comment | added | user100476 | I appoligize I ment 1/16" rod. I will fix it. And my other mistake | |
| Jul 14, 2016 at 16:17 | comment | added | Steve G | I believe this will not work. Even a quick Google tells me that for 1/8th inch welding rods you will need between 85 and 150A. Your Li-ion batteries will probably explode. | |
| Jul 14, 2016 at 16:16 | comment | added | user57037 | The capacity of the battery would be in Amp-hours probably. This tells you how much energy the battery contains. For example, if it really was 12V and 10 Amp-hours, you could drain it at 1 Amp for 10 hours. Because of inefficiencies, if you drain it at 10 Amps you will get much less than 1 hour. I am trying to figure out if what you want to do is remotely practical, because I know welding is an energy intensive process. I think you would need a very large battery bank to do it for more than just a few seconds. | |
| Jul 14, 2016 at 16:11 | comment | added | user100476 | I am not sure about the total capacity do to the lack of a high amp multimeter. I believe it was around 20amp 12 volt. Thanks for the caution I ha e welded quit a but in my life and after u get burned and arc flags a few time, you know to listen to the safety cautions | |
| Jul 14, 2016 at 16:05 | comment | added | user57037 | Please make sure that you follow all safety-related procedures for welding. In particular, make sure you wear heat resistant clothing and are prepared to extinguish a fire. It is very common to accidentally start fires when welding, and also when discharging Lithium batteries at very high rates. Do not do any of these things when flammable materials are nearby. What is the total capacity of your power bank (in Watt hours or Amp hours?) | |
| Jul 14, 2016 at 16:02 | comment | added | user100476 | For those of you who believe that this will not work, I have looked at the amperage ratings for many wielding rods and a 1/16 inch rod can be powered by 10-40 amp. If anyone could tell me what type of rod I should use or have any other recommendations please comment | |
| Jul 14, 2016 at 16:00 | history | asked | user100476 | CC BY-SA 3.0 |