I now have one of these..... - Page 2 - diyAudio
Go Back   Home > Forums > Member Areas > The Lounge

The Lounge A place to talk about almost anything but politics and religion.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 9th September 2004, 09:44 PM   #11
Banned
 
Join Date: Nov 2002
Location: Adelaide, Australia
Send a message via MSN to SkinnyBoy
Quote:
Originally posted by ace3000_1


Skinny, if you tap into your brothers room and draw 15amps this doesnt mean its safe to do so, he would have to have all apliances off, and depending on your cable length your lines maybe under rated. Power Cables are normally rated at their spec upto a distance of 15 - 20meters. Wheather your welder is on full pelt or not, it would be atlaest safe to power it with the required 15amps as stated by the manufacturer. How do you know it doesnt draw 15amps at half power? from a few welders that ive looked in they used a big resistor to control the power output thus drawing its rated current draw all of the time, the others wer switches to change the winding in the coils.

Trev

did I mention my brother is out over half the time? and when he's not home, all that is powered up in his room is a clock radio?
  Reply With Quote
Old 9th September 2004, 11:36 PM   #12
diyAudio Member
 
ace3000_1's Avatar
 
Join Date: Mar 2003
Location: spain
Send a message via Yahoo to ace3000_1
Quote:
do arc welders generally have some protection for if you short out the output? I guess it would have to.
No they dont, if you had a fuse for the output circut then you wouldnt be able to weld, because a arc welder is just a power supply that we short out on purpose.

Quote:
also, welding currents/voltages... whats best? I have 45 or 70 volts, at adjustable currents... I read somewhere that most small arc welders are 40 volts. is higher voltage therefore better?
Higher voltages are used for thick plate, normally 10mm and up, that also goes with the amperage, the thinner the plate is the lower the voltage and amperage.

Trev
__________________
"Every technique can be used in a great many ways, but mastering it, thats what realy counts."
  Reply With Quote
Old 9th September 2004, 11:37 PM   #13
diyAudio Member
 
ace3000_1's Avatar
 
Join Date: Mar 2003
Location: spain
Send a message via Yahoo to ace3000_1
Quote:
did I mention my brother is out over half the time? and when he's not home, all that is powered up in his room is a clock radio?
LOL, are you sure there isnt any grow lights in the wardrobe?
__________________
"Every technique can be used in a great many ways, but mastering it, thats what realy counts."
  Reply With Quote
Old 10th September 2004, 01:13 AM   #14
Banned
 
Join Date: Nov 2002
Location: Adelaide, Australia
Send a message via MSN to SkinnyBoy
Quote:
Originally posted by ace3000_1


No they dont, if you had a fuse for the output circut then you wouldnt be able to weld, because a arc welder is just a power supply that we short out on purpose.



Higher voltages are used for thick plate, normally 10mm and up, that also goes with the amperage, the thinner the plate is the lower the voltage and amperage.

Trev

I didn't say a FUSE, I said short circuit protection... I should have said current limiting.. but anyway see, my dad made an adjustable powersupply with a selectable current limiting.... .5amps, 1 amp, and 2.5amps (I think) so even if you dead short it, it still only gives that much current....
  Reply With Quote
Old 10th September 2004, 03:30 AM   #15
diyAudio Member
 
ace3000_1's Avatar
 
Join Date: Mar 2003
Location: spain
Send a message via Yahoo to ace3000_1
Quote:
I didn't say a FUSE, I said short circuit protection... I should have said current limiting.. but anyway see, my dad made an adjustable powersupply with a selectable current limiting.... .5amps, 1 amp, and 2.5amps (I think) so even if you dead short it, it still only gives that much current....
No short circut protection because your shorting the welder out on purpose to create the arc. There should be thermal protection but thats it, the psu your dad made is basically the same as your welder, you controll your current via the dial on the front, there isnt to my knewlege any over current protection on the input for over drawing power cos normally you would use a breaker with it in the fuse box.

Trev
__________________
"Every technique can be used in a great many ways, but mastering it, thats what realy counts."
  Reply With Quote
Old 13th September 2004, 06:23 AM   #16
Banned
 
Join Date: Nov 2002
Location: Adelaide, Australia
Send a message via MSN to SkinnyBoy
I think the current is limited by the core reaching saturation... the current is adjusted by moving a bar in and out of the core of the transformer....
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



New To Site? Need Help?

All times are GMT. The time now is 10:47 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2