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Tool Talk Discussion Forum

welding on drill stem

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Terry Chapman

03-30-2005 17:21:33




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my equipment trailer is made from oil field drill stem. i do ok on mild steel but i am NOT a good welder. every time i try to weld on this trailer everything just runs off on the ground. I have tried wrapping the lead around the pipe and also changing polarity. I recently bought a new tongue jack for 25.00. the local welding shop charged me 50 bucks to install it. (2 beads 4" long) I MUST learn to weld on this stuff. Any advice is appreciated.
Terry

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txblu

04-01-2005 05:23:31




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 Re: welding on drill stem in reply to Terry Chapman, 03-30-2005 17:21:33  
I use 2 3/8 and 2 7/8 for lots of things; always rusty. I usually use a 1/8" 6011 rod on AC somewhere around 125 amperes (+/- 50). Don't exactly remember, been awhile. I crank up the heat till the bead cuts too deep then back off. It's too cold when the weld looks like a scab; like a scab on your arm from a cut or something.

Mark



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Loren

03-30-2005 23:00:25




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 Re: welding on drill stem in reply to Terry Chapman, 03-30-2005 17:21:33  
We make drill pipe with this stuff at work, along with "projects". Unfortuneately I'm not that eexperienced a welder so I'll relate on thing I'm told at work on how to weld it. It's a high alloy high carbon steel, you need to preheat to keep it from getting very brittle later. Post heat wouldn't hurt either. We use wire welders with 1/16th" dual shield wire and I haven't turned on a stick machine for literally 27 years so I have no clue on that part. The ones at work we run are 400 amp machines at half power or better and they do good by me.

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coldiron

03-30-2005 22:31:02




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 Re: welding on drill stem in reply to Terry Chapman, 03-30-2005 17:21:33  
Terry, What rod and size are you using? What amps are you set at? Are you welding something to the drill stem or welding it to another piece of stem? What type of joints are u trying to mate up to? Put it all together right and it should come out ok if you don`t travel to fast and have the correct stick angle. If you can read your puddle you should be able to tell if your travel is right.



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Coloken

03-30-2005 20:11:20




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 Re: welding on drill stem in reply to Terry Chapman, 03-30-2005 17:21:33  
First use low hydrogen rod. Drill stem that I used was magnetic and a real bixxx to weld. Try placeing the ground in various spots. Some times the arc would blow straigh out.



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the tractor vet

03-30-2005 20:10:11




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 Re: welding on drill stem in reply to Terry Chapman, 03-30-2005 17:21:33  
Use 7018 on rev pol. and around 125 -160 should get the job done and make sure ya have the aera clean of rust and paint.



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big jim

03-30-2005 20:01:20




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 Re: welding on drill stem in reply to Terry Chapman, 03-30-2005 17:21:33  
Drilll stem is usually pretty thick and made of an alloy steel. If your welds seen to just run off, you are likely way to low on the amp setting. I'd try 175 to 200 amps for welding anything substantial to it.



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coup

03-30-2005 17:55:44




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 Re: welding on drill stem in reply to Terry Chapman, 03-30-2005 17:21:33  
how thick is the drill stem and what kind of welder do you have...//????



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Terry Chapman

03-31-2005 04:21:51




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 Re: welding on drill stem in reply to coup, 03-30-2005 17:55:44  
The drill stem is magnetic. my machine is 180 amp ac//140 amp dc. I've been using 1/8" 7018 rod. sounds like my problem may be low amperage, i've been using around 90-100 amps. (recommended by the local welding supply.) next time i need to do something i'll kick it on up and try it.
Terry



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Coldiron

03-31-2005 06:52:05




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 Re: welding on drill stem in reply to Terry Chapman, 03-31-2005 04:21:51  
Terry, Like Loren said, Preheat it to around 200 and don`t move fast. Take a little time and try to keep the heat fairly even. With the 1/8 7018 rod try the amps at around 120 to 130. The amp could go to 150 without much problem but I wouldn`t go over that. Remember, your 7018 rod doesn`t take the same action to weld as a 6010 rod. Keep it close at about a 45 deg angle and draw away fast if you want to stop and let the stem cool a little. When you restart, strike low at the stop point, work it 1/2 way up the stop point and hold for a second to restart your puddle then continue the bead. Hope it works for you.

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