Bevel prep for T joint?

   / Bevel prep for T joint? #1  

Cord

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Succeeded in breaking my log splitter this past weekend. Since I built it 15 years ago, it's been pretty reliable, but looking back I was really pushing my luck. A curly piece of wood got stuck in the head and I was trying to clear it using another piece of wood to push it through. Well, that second piece of wood had a layer of frost on it and it shot out like it had been loaded into a cannon. The 40lb chunk punched a lady standing next to the splitter in the gut and it took her right off her feet. She flew back about 3' and landed on a pile wood debris. The landing looked fairly gentle with her feet rotating up in the air. Rung her bell pretty well on the frozen ground but is otherwise ok. I can't believe she doesn't have broken ribs.

Looking at the splitter, when that piece of wood shot out it totally sheared the head off the rail. The metal piece that broke was 3/4" thick and 6" long. It ripped the metal lengthwise. The there was no discernable grain to the metal. Amazingly, my welds didn't fail. It's going to be a major project, but I already have new material on order and will be beefing it up. I need to get some pictures, but now just work off the description. I will be welding a T joint between two very thick pieces of metal. The vertical member is a 3/4" bar that has a fillet weld on both sides of the end. One side was then reinforced with a piece of 1/2" metal. There are three welds with the inner weld being concealed by the reinforcement. The horizontal member will be the 1" plate that I'm replacing. I'm seriously thinking about Ving out the T joint so I can get better penetration into the center of the joint. Thoughts on this? Due to access reasons, I think the V will be asymmetrical with the larger weld being on the outside. I've never welded anything so thick, so I could use some parameters. I'll be using GMAW, .045 and C02 and a 350a machine. I presume this needs to be preheated to keep it from warping? Once I start welding, should I stop to control the temps or keep making passes? Because all of the weld is on one side of the new 1" plate, I'm somewhat concerned about it warping. I presume I can help this by heating the backside?
 
   / Bevel prep for T joint? #2  
I think you have the right idea. What wire did you choose? Pre-heat never hurts . Bevel for sure. I't will move around when you tack it. I did a broken forklift fork back in the day but I was able to use a huge vise and jig it up pretty good. When I did the 1st tack it moved. I did 2 more on the back side and it moved back where it was ( got lucky). Preheated to 500 and started the welds in the center and worked out. I let it cool a bit for the 1st few passes and then just welded it up after it looked like it wasn't going to tweak. It turned out pretty good and is still in use. I've watched welders doing thick material with 1/16" dual shield and they just keep laying the beads and really don't let anything cool. I can relate to the flying wood. I had a similar piece pop and fly and broke my finger and sprained my wrist in a split second. Another one to a lessor degree I had a pop hit me in the boys. That'll set you down in a hurry. Always turn sideways on a tough split. :eek: Good luck on the repair.
 
   / Bevel prep for T joint?
  • Thread Starter
#3  
I have .035 and .045 ER70S-6 and switch between them depending on the material thickness. If I need a heavier wire I'd have to change the liner and don't own the drive rolls.
 
   / Bevel prep for T joint? #4  
I have .035 and .045 ER70S-6 and switch between them depending on the material thickness. If I need a heavier wire I'd have to change the liner and don't own the drive rolls.[/QUO

I was just wondering if you were using hard wire or dual shield. S6 045 works.
 
   / Bevel prep for T joint?
  • Thread Starter
#5  
Solid core. I'm thinking I might need to brush up on my spray transfer skills. Now I'm getting nervous.
 
   / Bevel prep for T joint? #6  
Naa. It will work. I'm not a fan of the heavy steel projects but they come and go. You'll get it.
 
   / Bevel prep for T joint?
  • Thread Starter
#7  
Well, here are the carnage pics. Looks like there was a very old crack under the start of a weld.
 

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   / Bevel prep for T joint? #8  
I'm upgrading my spliter and I am using stick 7018.
 
   / Bevel prep for T joint? #9  
The way that is fractured it is a tough job for a wire feed. It will take a lot of grinding and just fill in welding. Can you make a new member and get rid of the fractured piece? If welding is the only option, I would use SMAW probably 5/32 or 3/16 to reduce number of passes. Definitely need to compensate for warping. I could not recommend how, w/o seeing the whole thing and evaluate. Even bevel both side and welding sides off and on will help a lot. 60 degree bevel at least. The root passes are the most important to clean well and not leave any slag deposits as they will reflect out on each subsequent pass.

Ron
 
   / Bevel prep for T joint?
  • Thread Starter
#10  
Yea, I'm planning to replace it with some 1" plate. This will be a tough repair. Ordered a larger torch tip last night just so I could get through the existing welds.
 

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