Portable Welder Help with Parts

Discussion in 'The Projects Forum' started by cat3rn, Jan 7, 2009.

  1. cat3rn

    Thread Starter Active Member

    Jun 3, 2008
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    I have a schematic for a portable welder and would like some help with parts or any design mods to make it better.
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    That's a block diagram. No components are called out, so no analysis is possible.
     
  3. cat3rn

    Thread Starter Active Member

    Jun 3, 2008
    117
    0
    The alternator is 135 amp 14.8 volts. Standard for a Pontiac Grand Prix GTP.
    The battery is the typical 12v car battery.
    There are 2 - 1.5 ohm 8 amp resistors. (are these large enough)
    There is 1 diode (I need help with what type, size etc.)
    There is 1 Thermal Overload Switch (heat sensing to automatically shut off the welder.) I need help with which one here also.
    The wires to the ground and rod holder are 4 gauge.

    Sorry I should have included this earlier.

    Bill
     
  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    You have a very loud explosion in your future. :eek:

    Abandon the idea of using an automotive battery as a source of power for an arc welder.
     
  5. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    At first glance, the diode looks like it is in backward. And why the heck is it in the ground line?

    Sgt Wookie is right. Batteries need some kind of current limitation or they get too hot too fast. No current limitation is provided in this design. (Which would also make it a poor quality welder...)
     
  6. cat3rn

    Thread Starter Active Member

    Jun 3, 2008
    117
    0
    That is why I come to you guys. You're the Bomb (no pun intended - explosion lol)

    So instead of abandoning the idea - let's make it work. Any help is appreciated. I got that schematic off an older website and he made it work on an older jeep. I did see it in action but only used it for about 20 mins tops. A current limiter and other mods could make this work much better.

    Bill
     
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