Hi !
In some early threads
(http://www.mig-welding.co.uk/forum/showthread.php?t=12307)
There was talk about cheap gasless migs, that are using AC. There was debate that could that be even true... and yes, I do own one of those
To be honest, it "works fine" on occasional need to join two metals together without demands for structural strength.
But, as every machine has to be modified/pimped/(-> destroyed) so must this welder become also DC.
I've read many threads about modificating ac stick welders to dc, but does the same principles apply also to migs ? What i've looked inside the machine, its quite simple. Coil with four different power options and some electonics to handle the wire feed.
What I would need (I guess... ) is four diodes with high enough current handling . The mig is rated to 90 A. Could those diodes be replaced with SCR (thyristor) or with
http://cgi.ebay.co.uk/150A-800V-3-P...s_ET?hash=item518c3841e9&_trksid=p3286.c0.m14
and just use four of those diodes inside the module ?
After this it would be a DC welder, but what i've understood, it needs an extra coil to the DC line to work properly ? What i've know from "low current" electronics a capacitor accross the lines would smooth out the dc current, but is it needed here ?
Hopefully i do get at least some advice where to start, and then come back ask silly questions
In some early threads
(http://www.mig-welding.co.uk/forum/showthread.php?t=12307)
There was talk about cheap gasless migs, that are using AC. There was debate that could that be even true... and yes, I do own one of those
To be honest, it "works fine" on occasional need to join two metals together without demands for structural strength.
But, as every machine has to be modified/pimped/(-> destroyed) so must this welder become also DC.
I've read many threads about modificating ac stick welders to dc, but does the same principles apply also to migs ? What i've looked inside the machine, its quite simple. Coil with four different power options and some electonics to handle the wire feed.
What I would need (I guess... ) is four diodes with high enough current handling . The mig is rated to 90 A. Could those diodes be replaced with SCR (thyristor) or with
http://cgi.ebay.co.uk/150A-800V-3-P...s_ET?hash=item518c3841e9&_trksid=p3286.c0.m14
and just use four of those diodes inside the module ?
After this it would be a DC welder, but what i've understood, it needs an extra coil to the DC line to work properly ? What i've know from "low current" electronics a capacitor accross the lines would smooth out the dc current, but is it needed here ?
Hopefully i do get at least some advice where to start, and then come back ask silly questions