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Tool Talk Discussion Forum

Weld Inclusions

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9NJoe

09-07-2004 07:30:31




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Any expert welders out there? I have a question. I was making a hydraulic tank over the weekend using 10 Gauge and E7014 electrodes. After grinding my welds nice and pretty, I noticed that I had flux inclusions in the weld. Some pinhole sized and some quite large. Switched to E6011 and got better results but still has a few pinholes I had to plug. All was done with DCEN polarity.

I was wondering what causes the inclusions? Could it be moisture in the rods or did I not use enough current? Any Ideas?

Thanks,

Joe

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Trucker

09-10-2004 19:22:05




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 Re: Weld Inclusions in reply to 9NJoe, 09-07-2004 07:30:31  
Sometimes you get a batch of bad rods,or they draw moisture,or you didnt weld it right.Just grind it out good and try again,sounds like it was too low an amperage,and the angle you hold the rod at has an affect on it.Try practiceing on another piece of metal and if it does it then maybe its the rod. I wouldnt say I am an expert,but I have welded a lot of stuff,and I'm not afraid to climb on my welds,or pull it down the road without it falling apart.I've welded truck frames together and none of them broke that I know of,but I dont know everything,not even close.I know from the mistakes I've made,and if what I write helps you then I am happy to write it. I have made a living welding,and I like doing it.Lots of people are better than me,but if you are starting out as a welder,or doing a job to fix something,I can sometimes relate to it good enough to help.I drive a truck for a living now so I wont get on here every day,or maybe not even every month,but if it helps good.Others on here are better welders than me,and somebody every time answers,but if I can I will put something onto it. Theres a lot more to welding than sticking a couple of pieces of metal together,you have to have penetration,without undercut,thats heat setting.If you can just barely weld and you dont trust what you are doing,ask somebody.Theres no dumb question.However if you dont trust it yourself,then its probobly not done right.If its not done right you are a lot better off to fix it than to let it go because thats how you learn. I like your attitude because you say you had better results with deep penetration 6011.I think your problem is not enogh heat,moving too fast,or at the wrong angle.Try welding a bead with the same rod and look for a line as you adjust your speed between the puddle and the weld,when the line is straight across the weld you hit the right speed,thats the line between where the puddle is and where the flux is laying on the weld,its a line of flux in the red hot area of the weld.If the corners of the line are towards the puddle you are moving too slow,if the corners of the line are away from the puddle you are moving too fast,which is what I think is your Problem.

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9NJoe

09-08-2004 05:28:39




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 Re: Weld Inclusions in reply to 9NJoe, 09-07-2004 07:30:31  
Thanks to all, I am going to try some test pieces this weekend with various settings and see what I can learn. I suspect it was too low of an amp setting due to being afraid of burning through.

Joe



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T_Bone

09-07-2004 15:58:12




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 Re: Weld Inclusions in reply to 9NJoe, 09-07-2004 07:30:31  
Hi Joe,

Slag inclusions are general caused by to long of arc length and/or too low of amps. Set the machine about 15amps higher, set the tank at about a 10� slope, then run downhill paying close attention to arc length at a slightly faster travel speed.

You did preclean to "white" metal inside and out?

Mositure causes porosity with in the weld and usually on the surface.

T_Bone



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Charles

09-07-2004 14:53:49




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 Re: Weld Inclusions in reply to 9NJoe, 09-07-2004 07:30:31  
I use DCEP all the time and also I would use 7018 3/32 on that light of material. Never had any problems.



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old

09-07-2004 11:52:30




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 Re: Weld Inclusions in reply to 9NJoe, 09-07-2004 07:30:31  
I'm not an expert but heres some ideas. How clean was the metal dirty metal makes for holes. It should shine and have no oil etc on it to make a good weld that will hold liquids. Just my 0.02 worth



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