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Old 05-18-2010, 06:48 PM
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Taking 3 weld tests tomorrow and Thursday. The standard 5P 6g, a 309 6g, TIG root, stick out, and a 2205 MIG 6g. The MIG should be interesting, never ran MIG on a 6g coupon before.
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Old 05-18-2010, 09:50 PM
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Well I understand most of that except the 2205 part of the MIG test. I could search that but I'll wait for you to tell us you aced all the tests first.

I'm not sure if it's cool to wish you good luck so I'll go with Have Fun With It
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Old 05-19-2010, 07:22 PM
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Thanks Pyro, 2205 is a grade of stainless steel. We will start running those tommorow. Today was the 5p xx heavy 2 inch in 6g, a carbon sch 80 2 inch with 309 tig/stick and a 304 sch 80 2 inch with 309 tig stick. Seems we could have run a carbon stainless coupon with 309 and that would have met the requierments. I didn't understand why the duplicity if 309 tests but if there payin' I'm playin'. As for aceing them, you can't lie to the big eye. I will wait paitently for the results....
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Old 05-23-2010, 09:19 PM
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All the results came in friday and everything passed for all of us. There are still some more coupons to be tested and the 6 inch 2205 6g mig is proving to be a real problem. The prob is with the root, we can't seem to be able to dial the settings in to get the edges of the bevels to consume. We are left with an incomplete penetration root, and an un-exceptable amount of spatter on the I.D. I told the foreman if we can figure this out we'll be millionaires because nobody has done this before.
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Old 05-23-2010, 10:01 PM
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Good for you.

On the "6 inch 2205 6g mig" is that root mig too?

Hope you get it figured out.
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Old 05-23-2010, 10:08 PM
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Quote:
Originally Posted by journyman View Post
and an unacceptable amount of spatter on the I.D. I told the foreman if we can figure this out we'll be millionaires because nobody has done this before.
Fluxcore?
I couldn't pass a flat fillet weld test with fluxcore.
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Old 05-24-2010, 07:21 PM
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The 6 " 2205 was supposed to be an all MIG (solid wire) test. It was a substitute for multiple plate tests to qualify us for structure. The GF decided that we would do a 6g pipe because it was the material we had on hand, qualified us for all positions, and was cheaper that multiple tests. We were using a pulsed MIG process and .035 wire with tri mix gas, Spray arc, uphill progression. The root was simply impossible. We tried short arc and glob arc and couldn't get the puddle to push inside the pipe on the overhead portion of the coupon. At best the root pass would line up flush but not consume the knife edges. We were using argon as our purge with the joint fully taped. It just wouldn't happen. GF agreed to change the procedure and allow a TIG root and hot pass. After that the rest was mostly easy. I was surprise at how well the spray process worked running up hill. It laid a nice bean with out any undercut at the toes. The 2209 wires (compatable filler for alloy 2205) runs much better than 309 or 316, It seems to freeze much faster and that allowed much more manipulation of the puddle. Additionally the 2209 stick rod also ran much easier than 309 or 316. The GF told us 50 lbs of the rod cost $900.00
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Old 05-24-2010, 07:48 PM
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What was causing the excessive spatter?
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Old 05-24-2010, 08:07 PM
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Looking at the weld through the joint (as it was being welded), the spray cone was partially missing the puddle, in effect half the wire was going inside the pipe, coating the opposite side if the joint with spatter. When we held the cone just behind the leading edge of the puddle the spatter was greatly reduced, but the the chance of including the knife edged was made impossible. By running at the leading edge we could at least key hole the root, but the bead remained concave / undercut on the ID. It was an exercise in futility.
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Old 05-25-2010, 12:51 AM
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journyman
You explained that very well, I could see it working or rather not working.

Sounds like you tried all the angles.
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