How Much Heat Can Welded Joint Take ?

[The Coal Man]

Hi,

I have a 10mm stud that is stuck in a fixing that consists of threaded nut welded into a steel ring. My hope is to remove the 10mm stud from the fixing but my efforts so far have failed.

I have given it a prolonged soak with plus gas and tried to use two nuts on the stud, once acting as a locking nut to try and remove the stud without success. My two remaining options seem to be a soak with 50% ATF/Acetone then the double nut approack again or heat it up.

If I go for heat, my concern is that I could weaken or break the weld that holds the fixing that the 10mm stud is stuck in. My two available options for application of heat are either spot heat with an electric soldering iron or the flame from a gas cannister type of flame used for plumbing. Both sources of heat are quite mild so I would be surprised if they could damage the weld, however, I thought it safe to ask, just to be sure.

Any alternative suggestions to remove the stud gratefully received. I have uploaded a picture of the stud and the fixing.

Thx

 

[the snooper]

Go ahead and heat it up if both are mild steel it will be fine, are you sure the stud isn't welded in

 

[cumbriasteve]

1. I have often welded a nut onto the stud, that provides good leverage and combined with the heat from the welding usually does the trick.

2. A good pair of stilsons beats most stuck studs and bolts if they can be fitted on.

Looking at that weld though I suspect anything providing a lot of leverage could result with you having a stud and nut still stuck together in your hand and a hole where it came from..

 

[123hotchef]

looks like the stud is welding in there do you know for certain there is a nut in there?

 

[The Coal Man]

looks like the stud is welding in there do you know for certain there is a nut in there?

Yes, there is definitely an elongated nut or female thread of some type in there, I have three of these fixings, two of which are stuck and one that is loose. I have uploaded a picture of the loose one showing the thread with stud removed. The three fixings are boss head points on a 50mm diameter tubular steel ring.

The disaster scenario is the stud and nut still stuck together and a hole in the steel ring. The steel ring is riveted to a large satellite dish (1.5 metre diameter).


Thx

 

[cumbriasteve]

Your second photo shows what appears to be a much better welded nut, are you sure the stuck one has not been repaired, the weld does not look the same quality and looks cold without much penetration into the frame.

It's an easy fix even if it all did break out, or have you not got a welding set, sometimes we just assume everyone here does a bit of welding of some sort.

 

[gordon stephenson]

Try heating the surrounding area with your gas torch,as quick as possible, even wrap a cold wet rag around the thread, the differential in temperatures and expansion might allow you to remove with the double nuts (fit the nuts before heating)

 

[The Coal Man]

Your second photo shows what appears to be a much better welded nut, are you sure the stuck one has not been repaired, the weld does not look the same quality and looks cold without much penetration into the frame.

It's an easy fix even if it all did break out, or have you not got a welding set, sometimes we just assume everyone here does a bit of welding of some sort.

I am fairly sure there have been no repairs to the stuck one, it might be the chipped paint and powder coating that makes it look a lesser quality weld. Unfortunately, I do not have a welding set, hence my heat options of an electric soldering iron or a propane type gas plumbing flame.


Thx

 

[The Coal Man]

Try heating the surrounding area with your gas torch,as quick as possible, even wrap a cold wet rag around the thread, the differential in temperatures and expansion might allow you to remove with the double nuts (fit the nuts before heating)

Thx for the suggestion, I will give it a try, nothing to lose at this stage of the game...

 

[WorkshopChris]

If you have to drill it out its going to be easier to start at this stage as you have a nice flat surface and a good portion of thread sticking out to ensure you are drilling square. Or if you have to farm the work out it will probably be cheaper at this stage.

 

[rtbcomp]

An electric soldering iron won't do it. You really need a flame if you're going to heat it up.

 

[The Coal Man]

If you have to drill it out its going to be easier to start at this stage as you have a nice flat surface and a good portion of thread sticking out to ensure you are drilling square. Or if you have to farm the work out it will probably be cheaper at this stage.

The issue with farming the work out is transportation of the satellite dish, unfortunately I am not able to transport a 1.5 metre dish. I would need to get it collected and delivered back, all of which adds to the cost, there may a point at which it becomes unviable.

I will clean up the area around the stuck fixing and try my propane gas flame on it as the next step.


Thx

 

[Woody.v8]

The studs look to be stainless, that could explain the corrosion, As said give it some heat and a few sharp taps with a hammer might help break it free.

 

[Kent]

I am fairly sure there have been no repairs to the stuck one, it might be the chipped paint and powder coating that makes it look a lesser quality weld. Unfortunately, I do not have a welding set, hence my heat options of an electric
soldering iron or a propane type gas
plumbing flame.


Thx

No you need to get it hot not warm a plumbers torch etc is not enough to free owt stubborn you need to get it red

 

[The Coal Man]

Job done, bit of a pallaver but sorted.

The butane/propane plumbers torch just about had enough heat to get the studs out with the double nut method as a lock nut. I had to empty all the stuff out of the garden shed to get a wind break area as the plumbers torch did not have enough oomph to keep going in a breeze. I moved the 1.5 metre satellite dish into the shed, flashed up the plumbers torch and luckily managed to get the studs out..

Thank you all for your input, this forum is a great place for a bodge noggin like me to pick up advice.

Thx

 

[123hotchef]

Glad it was easy enough with a bit of heat mate