Page 1 of 3 123 LastLast
Results 1 to 10 of 23
  1. #1
    Member
    Join Date
    Aug 2016
    Posts
    27
    Location
    TN
    Tractor
    Ventrac 4500P

    Default Tig Weld what went wrong and whats next

    The chuck on my wood lathe spun off and hit the ground cracking it.

    I decided to try and tig weld it. I used my Klutch DC tig welder at about 60 amps. The weld looked really good after but then I decided to grind it to make it smooth again. This uncovered the porosity. I realized that it is a cast piece and I should have heated it before trying to weld it. I did add filler metal.

    Here is a picture of how it looks now. The porosity where the crack was is circled in green. I did hear it cracking after finishing one of the welds.

    So where do I go from here? Should I use it? Can I fix it? Should I trash it?

    Thanks in advance!

    Tig Weld what went wrong and whats next-crack-jpg

  2. #2
    Platinum Member
    Join Date
    Jun 2017
    Posts
    666
    Location
    West Chester
    Tractor
    Mahindra 2540

    Default Re: Tig Weld what went wrong and whats next

    Cast iron can be problematic to weld; with experience, it can be done. But for something that spins and can cause injury if it breaks, I'd take it to a welding shop with experience (myself, I would have preheated to really darned hot, and used a very high nickel filler) or replace it.

  3. #3
    Veteran Member sd455dan's Avatar
    Join Date
    Oct 2012
    Posts
    2,005
    Location
    North Idaho
    Tractor
    Rhino 554, JD550G dozer Gilson MTD riding mowers Ford 3000-Sold

    Default Re: Tig Weld what went wrong and whats next

    Quote Originally Posted by MountainBuck View Post
    The chuck on my wood lathe spun off and hit the ground cracking it.

    I decided to try and tig weld it. I used my Klutch DC tig welder at about 60 amps. The weld looked really good after but then I decided to grind it to make it smooth again. This uncovered the porosity. I realized that it is a cast piece and I should have heated it before trying to weld it. I did add filler metal.

    Here is a picture of how it looks now. The porosity where the crack was is circled in green. I did hear it cracking after finishing one of the welds.

    So where do I go from here? Should I use it? Can I fix it? Should I trash it?

    Thanks in advance!

    Tig Weld what went wrong and whats next-crack-jpg
    No expert here but would think you would need to determine whether that is cast steel or some form of cast iron...

    If a small amount of the surface is drilled cast iron will be very fine almost like powder where cast steel will give actual shavings.
    a tap with a hammer will have a ring with cast steel and cast iron will be more like a dull thud.
    lastly when you ground it down were the sparks dull red or amber, a sign it is cast iron - which is much harder to weld with out problems.

    What type of filler were You using? Also if it was a gas coverage issue did you use a gas lens - it might help


    i am sure some with a whole lot more knowledge will be here to help soon.

  4. #4
    Veteran Member
    Join Date
    Mar 2007
    Posts
    1,809
    Location
    Midwest
    Tractor
    Iseki TA 247. Husqvarna 54",Gravely Zero, Cub Zero,.Polaris 850 ATV's Stihl 018 026 Pro, 029, 034 Super AV, 039, 044 Mag. Stihl Pole Saw.

    Default Re: Tig Weld what went wrong and whats next

    60 amps would not repair this chuck but I need to know what you used for filler metal to start.

  5. #5
    Member
    Join Date
    Aug 2016
    Posts
    27
    Location
    TN
    Tractor
    Ventrac 4500P

    Default Re: Tig Weld what went wrong and whats next

    Thanks for the replys!

    Tap with hammer and real dull thud.

    Grinding did not like to spark at all but if it did, I would call it deep red. But with a small dremel it didn't spark at all. Only with the 4 1/2" grinder did I get anything.

    Filler rod was ER705-2 1/16. Really thought I got good penetration. Here is another picture of the underneath side

    The green circle shows the edge of one crack and the red circle is where I hit a crack but didn't use any filler wire. It balled up nicely.

    No gas lens.

    Tig Weld what went wrong and whats next-crack2-jpg

  6. #6
    Veteran Member sd455dan's Avatar
    Join Date
    Oct 2012
    Posts
    2,005
    Location
    North Idaho
    Tractor
    Rhino 554, JD550G dozer Gilson MTD riding mowers Ford 3000-Sold

    Default Re: Tig Weld what went wrong and whats next

    Very likely Cast Iron.

    some fillers that might work, 309 stainless, Hastelloy or Nickel rod, cast iron mig wire, or cast iron rod.

    There is Brazing rod to.

    Don't think ers70 of any type will work well for this... Most likely going to want some sort of pre- heat to

    Actually surprised how well it appears to have gone

    But I would not trust it for a high mass rotating part that you would be standing next to it.






    edit after a bit more thought- Buy a new chuck the danger of what could happen during a failure , is not an acceptable risk.
    Last edited by sd455dan; 11-05-2017 at 03:59 PM.

  7. #7
    Super Member Shield Arc's Avatar
    Join Date
    Jan 2009
    Posts
    5,972
    Location
    Port Orchard, WA.
    Tractor
    John Deere, 4200

    Default Re: Tig Weld what went wrong and whats next

    I bought some of this A2 Aluminum Bronze a few years ago. I've been meaning to try my luck with it on cast iron. But haven't done it yet.
    1/16" A2 Aluminum Bronze Tig 36" Rod - 1 Lb - AWS A5.7 ERCuAl-A2 | eBay
    Attached Thumbnails Attached Thumbnails Tig Weld what went wrong and whats next-fillet-weld-jpg   Tig Weld what went wrong and whats next-pipe-jpg  


    Miller Dynasty 300.
    Lincoln V350-Pro w/pulse.
    Lincoln LF-74 wire feeder.
    Lincoln SG Spool gun.

    2 Lincoln LN-25.
    1937 IdealArc-300.
    Everlast PowerArc 200ST.
    3 Lincoln SA-200s.
    Vantage 400
    1800 Ellis saw.
    Hypertherm Powermax 1250, CNC table.
    PROFAX Welding Positioner.
    JD2 model 3.

  8. #8
    Super Member woodlandfarms's Avatar
    Join Date
    Jul 2006
    Posts
    5,401
    Location
    Los Angeles / SW Washington
    Tractor
    PowerTrac 1850

    Default Re: Tig Weld what went wrong and whats next

    So this thing is spinning at 1500 RPM or so.. I do not want to be the safety police but I think I would get on Amazon and order a new one. I cannot imagine every getting this thing true.
    Power-Trac 1850, grapple, hoe, 90" mower, 72" box blade

  9. #9
    Super Star Member Gary Fowler's Avatar
    Join Date
    Jun 2008
    Posts
    10,639
    Location
    Bismarck Arkansas
    Tractor
    2009 Kubota RTV 900, 2009 Kubota B26 TLB & 2010 model LS P7010

    Default Re: Tig Weld what went wrong and whats next

    Without getting into the repair or replace argument, I think your welding problem is likely due to oil contaminated steel. I really doubt that the part is cast iron and more likely cast steel unless it is a really cheap lathe.

    Any way regardless of the parts metallurgy, you will have to grind out the old weld, preheat the whole thing hot enough to burn off all the oil and then re-weld it. I would use a stainless steel rod (any grade is better than the ER 70S-2 that you used). Stick welding would likely produce less porosity than TIG. Be sure to completely grind out all the old weld because if you leave even one bubble of porosity it is going to spread all thru the new TIG weld.
    2010 LS P-7010C 20F/20R gear tractor & FEL, 2009 Kubota B 26 TLB, RTV 900 Kubota,17 foot Lund boat with 70HP motor, 2012-20 ft 12k GVW trailer, 2011- 52" Craftsman ZTR mower, 2013 Ferris Zero Turn, 3 weed whackers, pressure washer, leaf blowers, 7 foot bush hog, 8 foot landscape rake , 8 foot 3 PH disc, 2 row cultivator, 350 amp Miller AC/DC welding machine and all the tools needed to keep them all repaired and running.

  10. #10
    Silver Member
    Join Date
    May 2017
    Posts
    134
    Location
    Grapeland, Texas
    Tractor
    Case, Kubota, John Deere

    Default Re: Tig Weld what went wrong and whats next

    At what speed do you spin it? The 1500 rpm seems on the low side for some turnings, mine will do 3200 rpm. Also, be sure you re-balance it before you use it. It may be better to replace since you'll be standing right next to it or in front of it if it decides to come apart again. Some things are not worth repairing in my opinion.

Page 1 of 3 123 LastLast

Similar Threads

  1. Tig Welding Failure, what am I doing wrong
    By woodlandfarms in forum Welding
    Replies: 24
    Last Post: 03-12-2017, 01:54 AM
  2. Tig weld problem
    By BeezFun in forum Welding
    Replies: 12
    Last Post: 05-21-2016, 07:50 AM
  3. Learning to TIG weld
    By Chain Bender in forum Welding
    Replies: 18
    Last Post: 09-21-2012, 11:59 PM
  4. Replies: 14
    Last Post: 06-18-2012, 06:56 PM
  5. TIG What's wrong with DC only (Maxstar 150)
    By boustany in forum Build-It Yourself
    Replies: 5
    Last Post: 10-31-2003, 07:36 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
© 2017 TractorByNet.com. TractorByNet is a registered trademark of IMC Digital Universe, Inc. Other trademarks on this page are the property of their respective owners.