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  1. #1
    Join Date
    Dec 2007
    Location
    Alberta, Canada
    Posts
    5

    Default TB350D HF251 problem

    Hello, I hope someone can help me out. I'm having an unusual problem when welding AC tig on aluminum. I'm using a Trailblazer 350d with an hf251 freq box. I have used this combo many times before without any problems, now something is wrong. The arc seems to surge so much that is displaces the puddle and makes hard ridges in the weld bead. I'm thinking the ac output is out of balance. This is something new that I've never had a problem with. The Machine has 2800hrs, 1/8" aluminum, 1/8" ceriated tungsten, machine dial set @230 amps. Any ideas?
    If it ain't broke, yer not trying hard enough!



    Miller Trailblazer 350D
    Miller Trailblazer 302
    Miller XMT-304
    Miller 12VS
    Miller Spoolmate 30A
    Miller S-32P
    Miller HF-251D
    2009 F-350

  2. #2
    Join Date
    Oct 2004
    Location
    Edmonton, Alberta
    Posts
    7,841

    Default

    Check your engine rpm no load via the frequency (HZ) at the auxillary 120Vac terminals

    Warm engine 62hz high idle no load, and about 43hz low idle no load

    Bet its way out....

  3. #3
    Join Date
    Dec 2007
    Location
    Alberta, Canada
    Posts
    5

    Default

    Thanks, I'll try that. If that is the case, why do you think it would've caused a sudden change? I used this set up about a month ago with no issues.
    If it ain't broke, yer not trying hard enough!



    Miller Trailblazer 350D
    Miller Trailblazer 302
    Miller XMT-304
    Miller 12VS
    Miller Spoolmate 30A
    Miller S-32P
    Miller HF-251D
    2009 F-350

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