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Video Request!

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Video Request!

Postby rahtreelimbs » Sun May 29, 2016 8:03 pm

I find it interesting when Jody cuts and etches a weld to determine penetration. What I would like to see is a side by side comparison between stick, mig and tig on penetration.
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Re: Video Request!

Postby Otto Nobedder » Wed Jun 01, 2016 1:49 pm

Rich, I'm having an excess of free time at work this week, and intend to weld a coupon of 3/8 A36 (or CorTen, depending on what's available) with backing bar, MIG, TIG, 6013 stick, in 1G, just to do a cut-and-etch.

You've piqued my interest to see the nuggets side-by-side.

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Re: Video Request!

Postby DLewis0289 » Thu Jun 02, 2016 9:11 am

EXCESS OF FREE TIME????? Well head on down to the Sunshine State, have a few columns you can help me build :lol:

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Re: Video Request!

Postby Otto Nobedder » Thu Jun 02, 2016 6:27 pm

DLewis0289 wrote:EXCESS OF FREE TIME????? Well head on down to the Sunshine State, have a few columns you can help me build :lol:


If you were closer to Cape Canaveral, I'd certainly consider it, at least short-term... :D

We completed our shop setup about a week ahead of the arrival of regular work, and everyone is hunting for PM projects, sweeping floors, organizing work areas, etc.
This gives me time for little projects like this, but only when the boss is there... I've got one sorry-ass tattletale who'll bitch to the boss if he thinks I'm doing personal stuff. Oddly, the guy without enough of his own business to mind can't be bothered to pick up his mess when he finishes a task. He thinks I should be job-scared, but he can only handle one task at a time, while I'm usually working three...

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Re: Video Request!

Postby DLewis0289 » Thu Jun 02, 2016 6:38 pm

Yeah you need those down times. No matter how well we try and stay organized after a big project it looks like a bomb went off in the shop, I have never had an issue with paying for PM and housekeeping, the dividends are worth it.
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Re: Video Request!

Postby Otto Nobedder » Mon Jun 06, 2016 7:13 pm

About the time I said I'd have free time, I got real busy... I am working on this, though. I've welded the SMAW and MIG portions of the coupon, and will do the TIG tomorrow. I don't know if the cut, polish, and etch will be done tomorrow or Wed., as I'm now doing this stuff during lunch. Should be interesting, as both the MIG and Stick are 5-pass welds, and I expect the same, or maybe 6, for the TIG.

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Re: Video Request!

Postby Otto Nobedder » Mon Jun 13, 2016 8:37 pm

All right, I finally have the etches...
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From top to bottom, Stick (6013), TIG (70s-2), and MIG (70s-6). The coupon was A-36, 37* bevel to knife-edge, 1/4" A-36 backer, 3/16" gap.

My immediate impressions are:

The 6013 showed it's low penetration, as the root (3/32 @ 90A DCEP) has very low forward force into the backer, but cuts fairly broadly into the sides. There's also a slag inclusion obvious. I may re-cut it later to see if I can find a clean surface. This was seven passes, with the last one intentionally wide of the opening to see the penetration on pre-heated metal.

The TIG was the most consistent, with good penetration into the backer, and each of seven passes are clear with their relative penetrations. This was 1/16 70s-2, 3/32 thoriated, 20cfm, #8 on a gas lens, at about 105A all the way out.

The MIG also has good penetration, but betrays my biasing of the arc to one side of the root (perhaps not fully perpendicular to the joint), as shown by the step on the right side at the backer bar. There are also two tiny silicon inclusions, also. These things show me me that, even for this exercise, I should have paid more attention and cleaned better between passes. This was .035 70s-6, 20.8V/350ipm, 70/25 at 35cfh, about 1/2" stick-out.

This is the first time I've done a cut and etch on my carbon work, as I work almost exclusively in stainless, and I've frankly learned a lot. I may have to repeat this exercise. If I do, the stick will be done 6010/7018 (I can hit up the LWS for some samples), for contrast. I may even do spray-arc MIG, to contrast that.

Any and all comments are welcome.

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Re: Video Request!

Postby Coldman » Mon Jun 13, 2016 11:13 pm

It goes to show that mig solid wire done properly can be a good solid weld with good penetration.
Thanks for the post. Very revealing.
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Re: Video Request!

Postby Coldman » Tue Jun 14, 2016 2:51 am

Nice clear macros Steve. What did you etch with?
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Re: Video Request!

Postby Otto Nobedder » Tue Jun 14, 2016 8:10 pm

Coldman wrote:Nice clear macros Steve. What did you etch with?


Dilute sulfuric acid.

The metal was dressed to 600 grit, then I submerged them in "Alumabrite", diluted to about 25%, for maybe five minutes.

It was that, or try an even more dilute solution of phosphoric acid in a rust-blck primer that would have had other impurities to deal with, so I tried this first and it worked.

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