Another New Lorch

  1. Brad93

    Brad93 M J B Engineering

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    No tried that. Got some pickling paste at work apparently, will have a go. If it contains sodium hydroxide or hydrofluoric acid & HCL acid it usually works. Takes about 10 minutes with the oven cleaner.
     
  2. Hood

    Hood If it walks like a duck....

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  3. Hood

    Hood If it walks like a duck....

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    Ok here it is.
    ScreenHunter_243 May. 20 16.15.jpg
     
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  4. Hood

    Hood If it walks like a duck....

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    Just looked up the pickling paste specs, see pic.
    ScreenHunter_244 May. 20 16.40.jpg
     
  5. Brad93

    Brad93 M J B Engineering

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    Ah yeah hydrofluoric that'll give a nice etch
     
  6. Brad93

    Brad93 M J B Engineering

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    Nice penetration on that. I'll have to have a few more goes
     
  7. Hood

    Hood If it walks like a duck....

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    I must admit I tend to like a hot weld with the Mig, always have whether that is good or bad I don't really know but they seem to last. I often have to repair cracked welds on the boats that have been done by others, they always look too cold to me.
     
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  8. Brad93

    Brad93 M J B Engineering

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    I find it very hard to put a hot weld down without it getting out of control and running away.
     
  9. Hood

    Hood If it walks like a duck....

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    I suppose it is all practice, I learned as I went, got my first Mig for Alu when someone wanted me to make a whaleback for their boat, took a wee while to get into the swing of it but it must have been a decent job as it is still on the boat and that must have been 20 years ago and never been repaired :) Well actually the boat was sold about 5 years ago so maybe it has fallen apart now :D
    Positional welding took a bit of practice to stop it running away but usually got decent results, now with the EWM though it is so easy I can't believe it. Still not the neatest at times but hopefully will get there.


    Edit, must have been more than 20 years ago as my mum died 20 years ago and it was at least 4 or 5 years before that. I am getting old :(
     
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  10. Brad93

    Brad93 M J B Engineering

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    More playing. 6082 T6 1/4" (6mm) 150x50 sample. Wire ESAB Autrod 4043 1.2mm. Machine set on synergic 6mm on both modes. Didn't record amps :doh:.

    Photo #1: Twinpulse. Dwelled in the pool for a bit longer. Leg length 6-8mm. End cut 50mm from end of run. 2T No crater fill. Small manipulation / whip of the wire.

    Photo #2: Speedpulse. Stayed on the leading edge. No manipulation of the wire/pool. Leg length about 5-6mm. Cut 50mm from the start of the run. 2T No hot start.

    Photo #3. Twinpulse is left - speedpulse right

    Part cooled completely between runs.

    Excuse the dark areas. I left the first etch on too long had to scotchbrite and repolish.
     
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  11. Hood

    Hood If it walks like a duck....

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    Looking good :) Well I think it is but no expert but certainly much better penetration there.
    Do you polish with a polishing mop before etching?
     
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  12. Brad93

    Brad93 M J B Engineering

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    80g, 120g, schotchbrite, then mop with white soap. Then acetoned to clean off residues.
     
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  13. Hood

    Hood If it walks like a duck....

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    Will have to try the polish and see. I just chop mine on the bandsaw and then a quick face mill in the Chiron then etch.
    Hoping to get a lot more testing done when I get through with the fitting out of the boats although I have a few people hounding me to do jobs back at the harbour, not been there really since December and they are getting impatient :D
     
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  14. HughF

    HughF Member

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    I'll have a go with the spoolgun this coming week, see what my results come out like - nothing fancy power source wise this end, 30v cv engine drive... Be interested to see how they etch, compared with the mixed-tig off the Hitachi.
     
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  15. Brad93

    Brad93 M J B Engineering

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    Never etched a tig Ali weld. Will have a go tomorrow.
     
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  16. Hood

    Hood If it walks like a duck....

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    @Brad93 found a couple of pics of positional welds I have done with the EWM.
    Second pic is of 2x 1" dia bars welded to some 1/4" angle, one of the 1" dia is acting as a spacer to keep the other part clear of the hinges. It was the first of the welds I have done with the 1.2 wire rather than the 1mm I used previously.
    Afraid I can't slice and etch them as the skipper wouldn't be too happy :D


    ScreenHunter_792 May. 21 17.23.jpg

    ScreenHunter_794 May. 21 17.42.jpg
     
  17. Hood

    Hood If it walks like a duck....

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    @Brad93
    Hope to get some practice in soon but did a couple of quick welds while I was waiting on the lathe.
    The reason I set it to 10.5mm for the first run was I had knocked the pot :D


    ScreenHunter_250 May. 27 11.39.jpg


    ScreenHunter_251 May. 27 11.41.jpg
     
  18. Hood

    Hood If it walks like a duck....

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    Lap joint this time, same material etc

    ScreenHunter_253 May. 27 12.13.jpg
     
  19. Hood

    Hood If it walks like a duck....

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    Ok last one for the day.
    Same material but vertical up
    Bit scrappy at first but adjusted the wire feed a few times to get where I thought it was good.

    ScreenHunter_804 May. 27 14.35.jpg

    ScreenHunter_803 May. 27 14.34.jpg

    ScreenHunter_805 May. 27 14.37.jpg
     
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  20. Brad93

    Brad93 M J B Engineering

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    Some excellent results there hood. I'll have to dig some thicker material out.
     
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