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  1. #1
    Join Date
    May 2014
    Posts
    12

    Default TB 275/ 302 DC unit and Tig welding

    Hello all
    So I have new question I have a TB 302 DC only unit, and today I tried to scratch tig and it wouldn't work it just melted the tungsten in an instant. What I have done with my buz box is just attached my gas block and tig torch to the stinger and the ground to the work piece. Yes there is no way back off on the heat but I have done this for years. I was trying to do the same with the TB but I think I am off some where, any advice. I would like to do AL too,, so I may just buy a dynasty and plug it in to the 220 side and just be done with it. what do you guys think
    thanks

  2. #2
    Join Date
    Nov 2003
    Posts
    3,111

    Default

    Melting back the Tungsten..??...Proper size..?? ...&....You are running DC Electrode Negative right..??..

    If you can... by all means get the Dynasty...

    You will not be sorry....
    Last edited by H80N; 05-20-2014 at 05:37 PM.
    .

    *******************************************
    The more you know, The better you know, How little you know......

    “The bitterness of poor quality remains long after the sweetness of low price is forgotten”

    Buy the best tools you can afford.. Learn to use them to the best of your ability.. and take care of them...

    My Blue Stuff:
    Dynasty 350DX Tigrunner
    Dynasty 200DX
    Millermatic 350P w/25ft Alumapro & 30A
    Millermatic 200

    TONS of Non-Blue Equip, plus CNC Mill, Lathes & a Plasmacam..

  3. #3
    Join Date
    May 2014
    Posts
    12

    Default

    yes it balled up the tungsten and than its gone instantly . Its a DC only machine so I can't switch from electro + or -. unless I try switching the actual leads.

  4. #4
    Join Date
    Nov 2003
    Posts
    3,111

    Default

    Quote Originally Posted by K&D welding View Post
    yes it balled up the tungsten and than its gone instantly . Its a DC only machine so I can't switch from electro + or -. unless I try switching the actual leads.
    Electrode Negative----puts the heat into your work..

    Electrode Positive---- will put the heat into the Tungsten Electrode..(POOF..!!)

    so check and if you need to physically switch the leads do so..

    Which model Trailblazer??.....Welder serial#...??
    Last edited by H80N; 05-20-2014 at 07:41 PM.
    .

    *******************************************
    The more you know, The better you know, How little you know......

    “The bitterness of poor quality remains long after the sweetness of low price is forgotten”

    Buy the best tools you can afford.. Learn to use them to the best of your ability.. and take care of them...

    My Blue Stuff:
    Dynasty 350DX Tigrunner
    Dynasty 200DX
    Millermatic 350P w/25ft Alumapro & 30A
    Millermatic 200

    TONS of Non-Blue Equip, plus CNC Mill, Lathes & a Plasmacam..

  5. #5
    Join Date
    Oct 2004
    Location
    Edmonton, Alberta
    Posts
    7,682

    Default

    Last time I looked there was lift arc on the 302, as yes kindly switch the cables like H80N said, with the Torch to the neg on your machine with pos going to the work clamp......You have tigged before haven't you???? Going to have to spool Aluminum

  6. #6
    Join Date
    May 2014
    Posts
    12

    Default

    I was following what the machine had said where to put the leads as my unit doesn't have a selector elctro + or - (unit ser# lh300258q stock # 907214). I didnt switch my lead cause I just assumed that there was something wrong with the lift-arc function. in hindsight an extra 5 minutes I may have had my answer.

  7. #7
    Join Date
    Sep 2005
    Location
    northern NJ
    Posts
    1,841

    Default

    This is how it should be hooked up, tig torch to negative & ground/work lead to +. It sounds like you are trying to tig in dc+ instead of dc-.
    MM250
    Trailblazer 250g
    22a feeder
    Lincoln ac/dc 225
    Victor O/A
    MM200 black face
    Whitney 30 ton hydraulic punch
    Lown 1/8x 36" power roller
    Arco roto-phase model M
    Vectrax 7x12 band saw
    Miller spectrum 875
    30a spoolgun w/wc-24
    Syncrowave 250
    RCCS-14

  8. #8
    Join Date
    May 2014
    Posts
    12

    Default

    cruz, mmw and HH,
    Yes I see the error, thanks again, I was following the Pic on the machine (ie stick/ TIG) not what I I know. Oh the joys of night shift work and being tired all the time
    thanks for setting me straight
    D

  9. #9
    Join Date
    Nov 2003
    Posts
    3,111

    Default

    Quote Originally Posted by K&D welding View Post
    cruz, mmw and HH,
    Yes I see the error, thanks again, I was following the Pic on the machine (ie stick/ TIG) not what I I know. Oh the joys of night shift work and being tired all the time
    thanks for setting me straight
    D
    Did that resolve your problem..??

    Do Tell..??... can you TIG with it now..??...
    .

    *******************************************
    The more you know, The better you know, How little you know......

    “The bitterness of poor quality remains long after the sweetness of low price is forgotten”

    Buy the best tools you can afford.. Learn to use them to the best of your ability.. and take care of them...

    My Blue Stuff:
    Dynasty 350DX Tigrunner
    Dynasty 200DX
    Millermatic 350P w/25ft Alumapro & 30A
    Millermatic 200

    TONS of Non-Blue Equip, plus CNC Mill, Lathes & a Plasmacam..

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