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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

MIG welding on boom

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Jim

06-19-2004 07:50:50




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I have a stress crack starting to develop around bucket eye on boom of my Ford 655C backhoe. I have ordered a Ford/NH reinforcement plate that fits around the eye to prevent this. I'm unsure what GMAW wire I should use, the manual says E7056 for the front loader blade, but I don't know if boom is different. Also, pure CO2 or an Argon mix? Thanks - Jim




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Dale(MO)

06-19-2004 19:30:25




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 Re: MIG welding on boom in reply to Jim, 06-19-2004 07:50:50  
Jim, I agree with Wayne. I run straight CO2 with my MIG, and it is fine for alot of applications, but you will get better penetration and less shrinkage with the mixed gas. And the more argon, the hotter the weld (better deposition, faster wire speed, less shrinkage, etc.). But as always, preparation is the key to a good weld. If you are already set up for CO2, I would use it. If your welder has low and high heat settings, run a good hot root pass on the low side, then switch to the high side for a second cover pass. Avoid weaving - run stringer beads (two passes side-by-side). Weaving leads to a thin weld in the middle, and a lot more stress. But if you can run a mixed gas, I think it would be beneficial. Good luck!

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Wayne

06-19-2004 18:26:54




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 Re: MIG welding on boom in reply to Jim, 06-19-2004 07:50:50  
If I'm welding up something like a boom, bucket, etc with the MIG I usually run a ER70-S6 wire. That is pretty much the equivilent of a 7018 stick rod. If you use a "normal" wire the most common gas is a 75% Argon-25% CO2 mix. Many of the different suppliers have their own names for it like Unimix, etc, but no matter the name it should be a 75/25 mix. If you want a little bit hotter arc you can go with something like a 98%Argon,2% Oxygen mix. It's more expensive than the 75/25, but it will give alot hotter arc and allow faster welding speeds, higher deposition rates, etc. It can, in effect, make a smaller welder act like a bigger one. That's for a regular gas shielded wire, but if your using a flux cored wire then let the welding shop recommend what you need to use. Some of those wires need no gas at all, and some of them will benefit from using a shielding gas. That's all decided by the wire mfg. Everybody out there has their own ideas of what the "right way" to weld something up, and their own opinions on what rod to use, etc, and most of the time most of the ways recommended will work just fine. In the end it all comes down to the prefference of the person doing the job as to which way they choose to do it/which way works best in a particular situation. The rest relys on having the parts prepped properly and the skill of the person doing the job. Good luck.

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Jim

06-21-2004 19:43:50




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 Re: Re: MIG welding on boom in reply to Wayne, 06-19-2004 18:26:54  
Thanks Dale & Wayne for your great advice. I went out & bought the materials you recommended and am just practicing until I get good enough to do the real thing now. I'm actually amazed how easy MIG is compared to stick, this is my first time using it.

Jim



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Lavoy

06-22-2004 12:28:12




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 Re: Re: Re: MIG welding on boom in reply to Jim, 06-21-2004 19:43:50  
If the steel is a higher carbon steel, it would not hurt to do a little pre-heat of the area as well. May aleviate any stress cracking form weld shrinkage.
Lavoy



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