Advice

[born lucky]

Ok. I need some weld advice.
I am having a hard time welding in two nuts one on each end. The nuts will take a acme threaded rod.
Problem I am having is that after I tack and check for smooth moment. Then I weld the nut. This causes the rod to tighten up. It makes it hard d to move the rod.
Any suggestions?

 

[slopdog]

you are going to have problems getting that to work . the heat from welding will draw and pull the nuts . between the heat and the cooling the chances of the treads being lined up would be pure luck . If u could find a rod coupling nut the correct thread that would be the way to go

 

[larry_g]

Can you show us what your working on? Welding is always going to deform and if your expecting precision work your on an uphill battle. I have a bit of automation experience and may be able to point you to a solution that does not require welding of the nut.

lg
no neat sig line

 

[Provincial]

Welding often causes nuts to shrink. If you can't run a tap through the nut after welding, Larry should be able to help you find an alternative way.

 

[dadsEH]

Nut shrinkage.....WAIT FOR IT.....

 

[NUTTSGT]

you are going to have problems getting that to work . the heat from welding will draw and pull the nuts . between the heat and the cooling the chances of the treads being lined up would be pure luck . If u could find a rod coupling nut the correct thread that would be the way to go

I was going to suggest threaded couplers also.


http://www.homedepot.com/b/Hardware...-threaded+rod?Ntx=mode+matchpartialmax&NCNI-5

 

[brent5631]

GIFSoup

 

[born lucky]

Nut shrinkage is what I thought!
I had good movement unit I applied more heat.
Just frustrating when you spend time on something and get low results

 

[bigguns69]

This will never work. Coupling nut.................

 

[ilovevocs]

Using what you have on hand; You may be able to cut the rod and use it like a tap to clean the threads up.

 

[rockinacummins]

Ok. I need some weld advice.
I am having a hard time welding in two nuts one on each end. The nuts will take a acme threaded rod.
Problem I am having is that after I tack and check for smooth moment. Then I weld the nut. This causes the rod to tighten up. It makes it hard d to move the rod.
Any suggestions?

Are you welding around the entire nut?

Sometimes I've had better luck only welding a couple of flats. This puts less heat on the nut.

 

[born lucky]

Are you welding around the entire nut?

Sometimes I've had better luck only welding a couple of flats. This puts less heat on the nut.

Yes The prints call this out. I think the engineer when overboard on this.
I was correcting an issue. The issue being the original welder did not use the threaded rod for alignment, so went assembly tried to insert threaded rod it was out of alignment!. I spent 2 days working on this job!

 

[joe49]

If appearance isn't a issue, peen the welds.

Pictures would be a big help.

 

[GaryM909]

I snugged the nuts together and then backed them off a bit. Worked for me using 7/8 nuts.

 

[kerrynzl]

This is how to prevent nuts from shrinking.

Heat them up to red, [to expand it] then weld them.

When the weld,and the nut cools together,it will shrink to normal size.


The problem you're having is the red hot weld is cooling and shrinking a nut that was at room temp.[pinching it] So equalize them.

 

[Danno1]

.



Or TIG weld them with minimum heat/small welds.

Also, run a tap through after they cool.



.

 

[gorilla]

An acme thread has more thread engagement area than a normal thread. This makes the thread distortion from welding more severe. Only fix is to run a tap through the nuts after welding.

 

[racer-john]

You might try a liberal coating of copper based anti-seize on the acme rod.

 

[no704]

Not real clear on what u are building. Might want to drill some holes in the tube and plug weld at the apex of the nut. Or fab some bungs and tap them after assembly in a lathe.

 

[rockinacummins]

Yes The prints call this out. I think the engineer when overboard on this.

I was correcting an issue. The issue being the original welder did not use the threaded rod for alignment, so went assembly tried to insert threaded rod it was out of alignment!. I spent 2 days working on this job!

This makes more sense. I'm not sure what an easy solution would be for that...

 

[born lucky]

This makes more sense. I'm not sure what an easy solution would be for that...

correct!
it was lots of labor on my part!