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Old 02-18-2009, 05:17 PM
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This site was posted on the Miller fourm. Lots of good info on mig and tig welding!
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Old 02-19-2009, 07:50 AM
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Thanks for the link Digr! Lots of interesting reading

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Old 02-19-2009, 08:30 AM
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4130 section leaves a lot to be desired
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Old 02-19-2009, 09:27 AM
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Aaron, this may be fortuitous for me, as I am going to look at a job this morning that wants some brackets made of 4130. They are to hang a piece of equipment on the wall weighing about #1000. I have not seen their design yet but they indicated that they wanted to use chromoly tubing. So, what are some good tips for welding chromoly? Also, what processes can be used, and still retain the good properties of the material, and what procedures?
I realize that this is pretty broad, but I'll know more this afternoon.

Thanks,
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Old 02-19-2009, 01:57 PM
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Quote:
Originally Posted by Walker View Post
Aaron, this may be fortuitous for me, as I am going to look at a job this morning that wants some brackets made of 4130. They are to hang a piece of equipment on the wall weighing about #1000. I have not seen their design yet but they indicated that they wanted to use chromoly tubing. So, what are some good tips for welding chromoly? Also, what processes can be used, and still retain the good properties of the material, and what procedures?
I realize that this is pretty broad, but I'll know more this afternoon.

Thanks,

Well , the only place you really get into trouble is the cooling cycle after a weld, and in some cased hydrogen embrittlement. Any of the common technologies ( i.e. OA, Tig, Mig, SMAW) can be used on 4130 with excellent results, provided a proper procedure is used. Depending on the thickness and joint configuration, it is safer to say that any electric welding will require some form of pre-heat and post-weld treatment to alleviate the possible problems formed by the rapid cooling nature of electric welding. This is the reason you still see a lot of OA welding on thinner 4130...by virtue of the large heat imput the resultant cooling rates for a weldment are very slow, so we eliminate a lot of steps, work, and time. However sections over about 3/16" typically benefit from electric welding in terms of effeciency and lower distortion, however there are still pre and post weld measures that are typically taken. So there is a broad sense of the material from an engineering perspective.
-Aaron
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Old 02-19-2009, 08:37 PM
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I'd be interested in knowing the procedure for my own edification, but it looks like this project is not going to use chromolly after all. I went and looked at the bracket design and they had just wanted to weld a piece of 1x .120 wall chromolly (for strength) directly to a piece of plate, bolt that to the wall, weld a piece of tubing cut in half perpendicular to the end, then hang early 1900's Indian motorcycles from them. I redesigned the whole thing with a gusset and a vee at the end and just plan on using a piece of 1 1/8" CRS. The plate and gusset mount on the cast in place concrete wall and are hidden by the wallboard so the only thing you see will be the rod sticking out. I am marginally concerned about a safety strap on them and may try to figure out some way to do that, but they will only be a foot or two off the ground.
I need to draw it up tonight (wish I could draw as well as digger) and submit it tomorrow. If it flys I'll post it up in the Fab section.
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