weld thread repair

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Evening all,Does the panel think it is OK to add weld (OA) to a badly damaged thread - looks like it was damaged when a nut or fitting was removed with an angle grinder - sufficiently well to be re-threaded successfully?Many thanks
Reply:Weld will be tough to drill and re-thread. It might be done, but not as original steel.Burt _____________________Miller Syncrowave 250Millermatic 211Miller 375 Plasma Cutter Hobart Handler 120www.10FtDrillBit.comwww.MyWelds.com - pictures of my work
Reply:Your best bet is to use a Thread repair kit such as helicoil.But to answer your other question.  You can drill the old damaged threads out to enlarge the hole.  You can then weld the hole shut, then drill and tap.
Reply:

Originally Posted by Boston1944

Evening all,Does the panel think it is OK to add weld (OA) to a badly damaged thread - looks like it was damaged when a nut or fitting was removed with an angle grinder - sufficiently well to be re-threaded successfully?Many thanks
Reply:Can you use a die nut/tap on it. or a fine three corner file or a thread file, all viable options if there's thread enough to get the fitting back on & tighten it.We had a submerged arc machine on old lathe that was used for building up trunnion shafts,that weld metal turned very nicely on a lathe. Gas shielded mig or tig might be your best options for welding it, other processes will allow slag inclusion, you didn't mention what the base metal was.NRA LIFE MEMBERUNITWELD 175 AMP 3 IN1 DCMIDSTATES 300 AMP AC MACHINELET'S GO BRANDON!"Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety.” BENJAMIN FRANKLIN
Reply:You have a photo?If a electrical panel you can damage the wires by welding. There is brazing and drilling and tapping witch uses less heat.Dave

Originally Posted by Boston1944

Evening all,Does the panel think it is OK to add weld (OA) to a badly damaged thread - looks like it was damaged when a nut or fitting was removed with an angle grinder - sufficiently well to be re-threaded successfully?Many thanks
Reply:It is a 7/16ths male thread on a mild steel bar. I can get a die nut on it but there is not enough material left in the one patch to make it viable once re-threaded. Hence wondered about a weld to build up a little.New plain steel bar re-cut with new thread might be easier in the long run.And thank you for comments so far
Reply:Its done all the time.www.urkafarms.com
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Originally Posted by Boston1944

It is a 7/16ths male thread on a mild steel bar. I can get a die nut on it but there is not enough material left in the one patch to make it viable once re-threaded. Hence wondered about a weld to build up a little.New plain steel bar re-cut with new thread might be easier in the long run.And thank you for comments so far
Reply:   I agree with all the points oldiron listed Not knowing all the pertinent details severely handicaps people who likely would be qualified to give you a good answer.But to strictly answer your question, within the framework in which you set it - if I were to try this repair, with a torch, I would be more inclined to use a small brazing rod and a little flux. I'm not saying it would even be what is known as low fuming bronze, but I don't think I would use steel filler.That being said, I really believe there are better ways to repair the item. Good luck with the project. Sent from my E6810 using http://tiny.cc/Forums_reader
Reply:Pictures pleaseRetired Old GuyHobart 210Lincoln AC/DC 225/125 Tombstone Evolution 14” Saw
Reply:

Originally Posted by Boston1944

Evening all,Does the panel think it is OK to add weld (OA) to a badly damaged thread - looks like it was damaged when a nut or fitting was removed with an angle grinder - sufficiently well to be re-threaded successfully?Many thanks
Reply:I agree I ask tooNo pictures I guess it is 10,000 words and maybe get rightDave

Originally Posted by NotaVegetarian

Pictures please
Reply:In my shop with mild steel would be blown full of wire weld and re drilled or drilled oversize if it was easy.  We drill up all the time, use bigger bolt if there is room.www.urkafarms.com
Reply:Is the bar round, or square? How long is the threaded section that will be used?  If there's just a small area that can't be threaded, maybe rethread what you can and secure it with red loctite, or maybe screw it in, then cut off the head and weld over it. Depends on what kind loading will be on it.-Ruark"Become one with the puddle, grasshopper" - Welding InstructorLincoln 3200HDHobart Stickmate LX235TWECO Fabricator 211i
Reply:He initially stated threads were possibly damaged removing a nut so that would mean it is threaded stud/bolt external threads. Without seeing what you doing and what yo have to work with hard to say but very likely you probably can weld some material in there and grind to diameter and get a quality die to cut through ok.
Reply:Totally unsafe to weld and rethread since this is probably the steering linkage from a church bus that brings nuns and puppies to the orphanage.

Dave J.Beware of false knowledge; it is more dangerous than ignorance. ~George Bernard Shaw~ Syncro 350Invertec v250-sThermal Arc 161 and 300MM210DialarcTried being normal once, didn't take....I think it was a Tuesday.
Reply:

Originally Posted by MinnesotaDave

Totally unsafe to weld and rethread since this is probably the steering linkage from a church bus that brings nuns and puppies to the orphanage.


Reply:

Originally Posted by m j d

definitely. I would hammer it on the stud and use loads of red loctite.
Reply:OK, Plan F:Just cut threaded part off and re-thread the whole thing with fresh threads......? Plan G:  Cut the threaded part off and weld a similarly threaded 7/16" bolt to it.-Ruark"Become one with the puddle, grasshopper" - Welding InstructorLincoln 3200HDHobart Stickmate LX235TWECO Fabricator 211i
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Originally Posted by Ruark

OK, ....Plan G:  Cut the threaded part off and weld a similarly threaded 7/16" bolt to it.
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Originally Posted by MinnesotaDave

Totally unsafe to weld and rethread since this is probably the steering linkage from a church bus that brings nuns and puppies to the orphanage.


Reply:It is like welding on jet airline engines.No one would ever do that.Dave

Originally Posted by StandarDyne


LOL, you owe me a keyboard!
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Originally Posted by Oldiron2

What if it's a stand-off-stud cast in a hunk of C-4, or worse yet, a more sensitive, more brisant newer material that was removed from a shaped charge after testing of other samples showed that, although much more efficient, its greater sensitivity created serious problems?


Reply:Give every monkey in the world a typewriter, with unlimited paper, have them bang on the keys,,Eventually they will type every page in an encyclopedia,, with 100% accuracy.I feel like we are the monkeys, making guesses at what this thread wants to know,,External, or internal threads??

Originally Posted by SweetMK

Give every monkey in the world a typewriter, with unlimited paper, have them bang on the keys,,Eventually they will type every page in an encyclopedia,, with 100% accuracy.I feel like we are the monkeys, making guesses at what this thread wants to know,,External, or internal threads??
Reply:

Originally Posted by MinnesotaDave

Schrödinger's thread repair


Reply:Need a photoDave

Originally Posted by Boston1944

It is a 7/16ths male thread on a mild steel bar. I can get a die nut on it but there is not enough material left in the one patch to make it viable once re-threaded. Hence wondered about a weld to build up a little.New plain steel bar re-cut with new thread might be easier in the long run.And thank you for comments so far
Reply:

Originally Posted by StandarDyne

It's actually not that hard so long as you stick to the drawing:


Reply:Probably holds the Jesus Nut on a whirlybird. Just slather some JB Weld on it.
Reply:Great draw that they had that drawing in my drafting class in 1970. But was inches not monkey marks. Dave

Originally Posted by StandarDyne

It's actually not that hard so long as you stick to the drawing:


Reply:JB Weld is great for bad welders.It covers up the bad welds for the inspector say looks great pass. Dave

Originally Posted by Wolfman

Probably holds the Jesus Nut on a whirlybird. Just slather some JB Weld on it.