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I'm toal new to this.I have a car compressor hex bolt stripped. It's a M12 (about 1/2") hat shaped hex head about 5" long bolt to car. I tried Craftman bolt out, no use because the bolt is hardened steel. Now I bought a harbor freight 120A stick welder. Tried to weld a bolt head to the strpped head. first the arc can't last, I read this forum and expert here hinted to thrust the coating on to the point (because every time arc died I found the coating stick out of the wire), now the arc can last but it just false welder, peeled off immediately. Seemed to me the weld didn't melt both bolts, I used 120v with supplied stick which I believe is 1/16" 6011 or 6013. The question is is the weld can stand the torque to unscrew the bolt? Also can anyone here to help with the weld? I am in Las vegas, I don't know if there is any member here lives in Vegas to help me or give me some expert advise. I now cut a slot tried to insert a screw driver still no vail.
Reply:Is it possible to grind the head off the bolt? pull the compressor out of the way, then grip the bolt with Visegrips and spin it out? Once the head is gone only the friction of the threads will be holding the bolt. I have had headless come out with just what I could grip with my fingers.Also there are LEFT HANDED drill bits. You might consider a Left Handed Drill bit in a reverseable drill; the vibration and pressure from the drilling operation might cause the bolt to unscrew as you are drillingLast edited by nadogail; 07-08-2011 at 07:50 PM.Reason: added textI offer three choices: Good, Fast, & Cheap. You may pick two.Hobart AC/DC StikMate LXHarbor Freight AD HoodHarbor Freight Industrial Chop SawDeVilbis 20 Gallon, 5 HP Compressor
Reply:I would drill the bolt out using a cobalt bit. I use a 1/8" bit for the pilot hole, then go larger until I can get a screw extractor into the bolt. If the bolt is solidly stuck, do NOT overtorque the extractor!I drill the rest of the bolt out and install a Heli-coil insert.
Reply:can't do that. The space is too limited ( about 4") otherwise I might find a stud weld gun or drill even righ angle drill can't reach
Reply:Removing broken/stripped bolts has been covered several times. I think Zap posted about using wax and heat to break loose stubborn bolts in one thread.Here's on thread I found quickly and there are a ton of others on broken easy outs and so on that probably cover similar info. Do a search and read a bunch of the threads and you'll fiuns a ton of ideas and suggestions.http://weldingweb.com/vbb/showthread.php?t=37066.No government ever voluntarily reduces itself in size. Government programs, once launched, never disappear. Actually, a government bureau is the nearest thing to eternal life we'll ever see on this earth! Ronald Reagan
Reply:Put a hex nut over the stripped bolt head and weld up the inside of the nut.to the head of the bolt.The heat of welding the nut on will travel down the shaft and help to loosen it, then you can put a wrench on the nut and turn the whole thing out."The reason we are here is that we are not all there"SA 200Idealarc TM 300 300MM 200MM 25130a SpoolgunPrecision Tig 375Invertec V350 ProSC-32 CS 12 Wire FeederOxweld/Purox O/AArcAirHypertherm Powermax 85LN25
Reply:tried that. seemed the inside of the nut and bolt head both not melt. 9
Reply:Originally Posted by noritePut a hex nut over the stripped bolt head and weld up the inside of the nut.to the head of the bolt.The heat of welding the nut on will travel down the shaft and help to loosen it, then you can put a wrench on the nut and turn the whole thing out.
Reply:Are you sure you tried 6011? Your 120 amp welder should handle 3/32 6011 with enough heat to melt both the bolt and nut. The 1/16 rods may not run hot enough.I offer three choices: Good, Fast, & Cheap. You may pick two.Hobart AC/DC StikMate LXHarbor Freight AD HoodHarbor Freight Industrial Chop SawDeVilbis 20 Gallon, 5 HP Compressor
Reply:norite's way is how i would do it .i use 1/8 6011 rods about 120 amps .i have done this a lot, most time they are broke off flush. i think you are not getting it hot enough.good luck.millermatic 35 acdc thunderboltesab 2522 oxweld w-17 torchesesab plasma cutterspeedway fluxcoreold bug gas welderROLL TIDE
Reply:I will try buy a pack of 3/32 or 1/8 6011 to try. The problem is my home power supply. I use gas for dryer so only have 120v source. Also the breaker are all 20A tripper. I am afraid it might trip the breaker,
Reply:Originally Posted by noritePut a hex nut over the stripped bolt head and weld up the inside of the nut.to the head of the bolt.The heat of welding the nut on will travel down the shaft and help to loosen it, then you can put a wrench on the nut and turn the whole thing out.
Reply:Originally Posted by zebra100I will try buy a pack of 3/32 or 1/8 6011 to try. The problem is my home power supply. I use gas for dryer so only have 120v source. Also the breaker are all 20A tripper. I am afraid it might trip the breaker,
Reply:Originally Posted by WrenchtamerThis would be my method of choice as well. I have removed a lot of bolts and earned near superhero status at my last shop for removing a broken harmonic damper bolt from a hardened steel crankshaft and rethreading it. It took me two days and I got paid for every hour. Otherwise the engine would have been scrapped or removed and the crankshaft replaced. I think when you get enough heat in there you will get it out no problem. welding inside of a nut can be tough, especially if you dont have enough clearance to get an oversize nut on there that's easier to weld through. Also, a lot of times on close quarters compressor bolts they were cross threaded in the frist place and that's why it broke. If this is the case, it is less likely that you will be able to turn it out and you will probably have to drill it. If the threads are not crossed, the heat you get from a good weld, as stated, is usually enough to break it loose. Is the mounting flange aluminum or steel? This too might make a difference in how best to remove it.
Reply:A few pictures would help so we could see the bolt. What kind of car are you working on and what motor is in it? How many bolts hold this compressor on?www.georgesplasmacuttershop.comPlasma Cutter and Welder Sales and Repairs--Ebay storeTec.Mo. Dealer Consumables for the PT and IPT torch's
Reply:Sorry for delay. I worked day and night. the car is hyundai sonata. and the compressor is bolted by 4 hex to the car. these are 9 inch long bolts throgh the compressor on to car.This one I uncrewed wrong way a bit, but the other upper one already lossed. car is 2003 bolts are not rusted or anything
Reply:Probably corrosion between bolt and aluminum housing. Real pain in the a22. Had one break in a waterpump Drilled bolt out through the pump than screwed the stup out with my fingersMillermatic 252millermatic 175miller 300 Thunderboltlincoln ranger 250smith torcheslots of bfh'sIf it dont fit get a bigger hammer
Reply:I've gotten them out by welding a larger washer (fender) to the stud first, then weld the oversized nut to the washer. This gives you a little more space to work with and you don't have to fight and get deep into the nut. Don't use plated washers or nuts. Good luck, DDWell like they say in the Nut House --- I'M OFF
Reply:The hex head is still sticking out, thought I cut a slot on it. I just wondering it's better for me to weld a screw drive head bit into the slot then use a lock piers or weld a nut onto the hex head remains. both methods seemed to me has limited melting area or hard to access ( from nut hole onto hex head stud)
Reply:Hooray! I've done it! Actually, HF 120A at 120v with 1/16 6011 is powerful enough. the problem with me is the limited space. I used a long 1/16 with nut but can't reach inside to melt the hex head and nut together. file another nut (nut inside is not good enough to fit the hex head, larger size nut leave too much space). cut 6011 1/16 to 4 inch. reach inside, stuck several times, ( one time made the whole stick red), remember this is my first time weld! finally fired up and found leave more space for arc made pretty heat, actually I melt some of the nut surface Lucky still can fit in the socket). Wait it complete cooled down, applied some PB on to connection points, use a socket with prolonged handle ( I used a steel pipe from Homedepot to extend my handle, one squeeze sound, the bolt gave up. later I will show a photo of the bolt.Thanks again for everyone here to help a newbie! God bless you all!
Reply:one note is 3/32 6013 seemed too much for 120v it tripped my breaker but maybe because my lousy skillsub |
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发表于 2021-9-1 00:12:51