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Welding cracks and welds that crack?

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Mike

12-26-2002 12:30:12

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Help,I have an old MF industrial with a 200 loader. The booms are made of boxed and welded thin plate and have and have had many cracks and old welds from repairs. The old welds are arc and look very good, but cracks have developed along the weldments and the origional steel. I suspect that the origional steel may be high carbon and the steel is being over hardend in the heat effected zone. What is the best way to deal with this when I reweld the cracks? I can use MIG-75/25 gas, stick arc or gas. Which is best for high carbon steel? If I use an arc process, should I use the torch to anneal the weldments after I weld? Do I need to preheat? HELP
Have a great holiday season and a good new year!
Thank You, Mike

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Greg

12-27-2002 11:09:48

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Re: welding cracks and welds that crack? in reply to Mike, 12-26-2002 12:30:12

Hi Mike

I'm in the process of mucking out the shop to fit an older FarmHand loader onto a 6610 and will also be dealing with some of the same problems you are encountering.

Looks like some of the others are thinking they'll have to write a book to cover what your're asking. A search thru some of the previous posts will cover a lot of info that you are needing & that I may also be reading into your post between the lines. If You think I may be of further help, I could e-mail you a phone number & a warning that it won't take long to pick this one's brain. ;>} The link below will take you to 1 of 3 pictures in the Implement Photos section that was built with dissimilar steels.

Brush & Rock Rake

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Mike for Greg

12-27-2002 21:33:28

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Re: Re: welding cracks and welds that crack? in reply to Greg, 12-27-2002 11:09:48

Greg, I would appreciate the opportunity to talk to you. What is a good time to call? What part of the country do you live in so I can figure the time? Thanks,Mike mf205ind@yahoo.com

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TimC

12-26-2002 20:14:30

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Re: welding cracks and welds that crack? in reply to Mike, 12-26-2002 12:30:12

Sounds like stress to me. I am by no means a metalurgist (spelling) but you said "thin plate".
If the entire peice is flexing then that may be the source of the problem.

???Ad some gussets or braces to stop what caused the original cracks to begin with??? You might add a plate (over the repair) to spread out the forces that are working against you.

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