That time again

Streamwelder · Thu Mar 30, 2017 10:12 am

Time to re-cert on D17.1, not a very big deal except for the thorn in all aero welder's side (aluminum T). My question to those who have experience with it is, Can I fit the joint open root? The T joint diagrams in D17.1 show the joint having a gap in it. Although I can't find any dimensions on what size gap is acceptable, but at the same time can't find anything saying it has to be closed root. Also I can't find any accept/reject dimensions on melt-thru or push-thru. Thanks in advance for any and all input.

LtBadd · Thu Mar 30, 2017 6:27 pm

That is interesting, when I took this test it was to MIL-STD 1595, many years ago, I don't think we had that option. You just need penetration to the root, right? We had Miller Syncrowave 300, used zirconium tungsten and put the pedal to it.

Thu Mar 30, 2017 8:23 pm

Streamwelder wrote:Time to re-cert on D17.1...

If it's a re-cert, I'm curious why you don't already know.

Steve S

Streamwelder · Mon Apr 03, 2017 6:45 am

Just trying to find other options instead of fighting the root fusion. I've never tried it with an open root, just wondering if anyone else had.

Streamwelder · Mon Apr 03, 2017 9:59 am

That's right Badd, that's the rough part .040-.050 6061 with pretty much 100% root fusion. We're allowed .1 x's the leg size or less of incomplete fusion at the root.

Mon Apr 03, 2017 7:08 pm

I'll have to dig. Jody did a video specifically on this in the past few months. I think he discusses acceptance criteria. I don't recall him mentioning a root gap, though. The test should have a WPS supported by a PQR, with all the pertinent specs. To test you with a drawing alone is setting you up for trouble.

[Edit] Here it is on youtube:

http://www.weldingtipsandtricks.com/alu ... t-d17.html
Read the written blurb below the video before you hit "play".

Steve S