Broken slide

Discussion in 'Gunsmithing and Repairs' started by chris in va, Jul 23, 2022.

  1. chris in va

    chris in va Member

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    If anyone can put me in contact with a reputable gunsmith that knows how to repair a break I would appreciate it.
     
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  2. N555

    N555 Member

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    How broken?
    Usually means get a new slide.
     
  3. chris in va

    chris in va Member

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    No more slides available. Thin part behind extractor broke clean through.
     
  4. film495

    film495 Member

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    you might want to call metal fabrication shops. if they are doing a straight mechanical metal fix, they likely have done or know how to fix just about anything metal. maybe gunsmiths know how to do it, but if I had to hazzard a guess, tapping some transferrable knowledge from metalwork industry might pan out. good luck
     
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  5. BBBBill

    BBBBill Member

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    Sounds like a job for micro TIG or laser welding. There are a few shops around that specialize in that. It might help to know what gun the slide is for.
     
  6. WrongHanded
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    WrongHanded Contributing Member

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    Pictures please. I do custom metal fab, I can probably give you an idea of the feasibility of a repair.
     
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  7. chris in va

    chris in va Member

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    If you need more let me know. It's a CZ 97b.
     

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  8. WrongHanded
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    WrongHanded Contributing Member

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    Sorry to tell you, but I think it's done.
     
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  9. N555

    N555 Member

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    Yeah that's a real bad place for a crack.
     
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  10. The Glockodile

    The Glockodile Member

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    AD3E01B1-85AA-448D-8948-56A07BDC101E.jpeg

    AEB727B2-7454-44E0-96F9-F674EC5121EB.jpeg

    The older SIGs and HKs (?) had their "slide snouts" welded on, back in the days of folded carbon steel (?) and pinned breech faces.

    How would welding this one differ?

    Just curious.
     
    Last edited: Jul 29, 2022
  11. Bwana John

    Bwana John Member

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    upload_2022-7-28_14-51-16.jpeg
     
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  12. WrongHanded
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    WrongHanded Contributing Member

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    I can't speak to those guns, however....

    To weld that with full penetration and completely re-fuse the crack, requires either a lot of heat, or to remove metal from the crack and then fill it back in with filler metal. Then that area would need machining back down. To settle for partial penetration would mean the crack could work it's way back through the welded surfaces on time. Cracks are tricky like that.

    Now there are a couple problems with full penetration welding too First one is that putting that amount of heat into such a thin piece of metal, will like result in distortion and/or shrinkage at the joint as the filler material and base material cool. The other is that welding creates what is known as a 'heat affected zone' on either side of the weld. It occurs in the metal that is heated to a point high enough to change the structure of the molecules, but not hot enough to melt it. The structural change cannot be reversed unless the steel is taken to a molten state and allowed to solidify again. And it is a hard but brittle molecular structure. Not great for something thin that will take repeated rapidly applied forces.

    Then there's the question of trying to match (as closely as possible) the filler material to the type of steel the slide is made from. And the question of the weldability of the base metal. Not to mention the trouble of removing contaminates from inside the crack.

    That might not be what you were asking, but perhaps someone will find it educational.
     
  13. David Hoback

    David Hoback member

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    Much of the post is true. That is a BAD crack. Can’t just weld over. It would need ground out mostly & filled. There are Tig alloys that would match up well, and while it would not need to be taken to “molten” state, it would need to be re-heat treated. It would also need to be machined where the rail was filled. This is a machinist’s job, not just a gunsmith. And very labor intensive. I doubt you’ll find someone who wants to take it on. Cost prohibitive. They would have to charge you too much so it not worth it.

    I’m sorry to say, but I’ll have to agree that it’s time has come. Sorry.
     
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  14. WrongHanded
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    WrongHanded Contributing Member

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    That may have been an over-simplification from so inspection training I received. Thanks for the correction.
     
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  15. earplug

    earplug Member

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    You might find a used slide on the internet. Frames get destroyed and the parts get sold.
     
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  16. David Hoback

    David Hoback member

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    Yeah, I get it. You’re not too far off actually. When steel is heated to the point of change, it’s called Austenite, or Austenitic Cristaline state. It’s somewhere “in between” liquid & solid. Of course its still solid, but look at the steel glowing red. The surface MOVES!
     
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  17. Blkhrt13

    Blkhrt13 Member

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    If they just try to weld that the crack will just move. Cracks have to be drilled out at the end to stop them moving. I agree the hardening will be affected on the slide as well.
     
  18. Nature Boy
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    Nature Boy Contributing Member

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    Did you call CZ and see what they might do?
     
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  19. highlander 5

    highlander 5 Member

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    You might want to check with Numeric Arms/Gun Parts they may have parts for your CZ. Does Witness make a 45 acp or maybe one one of their 10 mm slides might work with some work.
     
  20. 4v50 Gary

    4v50 Gary Moderator Staff Member

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    That can be welded like the de-milled arms are, but would you want to have that done? I would not want responsibility for failure if the weld broke.

    Shop around for a replacement.
     
  21. Slamfire

    Slamfire Member

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    I think that is the first thing to do. I looked at a CZ web site, and the pistol was discontinued in 2022. There "should be" parts still available. Call Customer Service and tell them your problem, find out if the factory will warranty that pistol. There may be a secret recall, and you don't know, because its secret. ;) And if there is not, find out how much it costs for a new slide.

    Assuming, the factory won't send the old slide back, rob the old slide of everything you can take off! Spare firing pins, springs, sights, etc. Do check to see if they will send the old slide back, I doubt they will if it is warranty work. But, if they keep it, they sure won't be re using any of the old parts.

    And I totally agree with the experts on not welding that crack. Do notice that the crack is along the load path from the locked breech to the breech face. And that is one thin looking piece of rail, That is support structure. Welds on primary load paths are iffy, because welds are weaker than the original material. Some of the welders can tell you how much strength is derated in an area of a weld. I recall someone saying that welds were treated as a 50% reduction in material strength. And then of course, melting the material will ruin any heat treat, and only CZ knows how to heat treat their slides.
     
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  22. doubleh

    doubleh Member

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    Not true. If the correct filler metal and welding procedures are used the weld is stronger than the parent metal. Where you get into trouble is with the parent metal and how weldable it is.

    I would still find a new slide or junk the gun. If it is possible to weld it and re-heat treat it is is going to be costly. Personally I wouldn't touch it with a very long stick and I made my living for years doing hi-pressure welds.
     
  23. Spats McGee

    Spats McGee Moderator Staff Member

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  24. gobsauce

    gobsauce Member

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  25. Spats McGee

    Spats McGee Moderator Staff Member

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    Drat. I missed that.
     
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