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Up Topic Welding Industry / Inspection & Qualification / Arc Strike
- - By Jim Hughes (***) Date 04-28-2009 15:11
Check out these pictures from a project that we are involved in. You are seeing some vendor supplied piping. The vent piping you see in picture 002 shows an arc strike. Picture 001 shows a leak. Picture 004 shows excavation of leak area. Picture 005 shows propagation of crack shown by PT. This is P91 material. This is a text book example of why arc strikes need to be dealt with.

Jim
Parent - By supermoto (***) Date 04-28-2009 15:28
Where are the pics?
Parent - - By fbrieden (***) Date 04-28-2009 17:12
I think I just went blind!
Parent - By BryonLewis (****) Date 04-28-2009 17:33 Edited 05-01-2009 22:13
It looks to my untrained eye that the cracks are so big that the material and pictures have cracked into oblivion.  :-)

That's better:

Damn!  That puts it into perspective especially with the weld ground out.
Parent - - By lonewolf658 (*) Date 04-29-2009 01:22
Is this one those trick questions for us that are learning to become CWI'S to se if we can find the defects??
Parent - - By CWI555 (*****) Date 04-29-2009 11:16
It's an exercise in contrast sensitivity.
Parent - - By 803056 (*****) Date 04-30-2009 10:49
Wow Jim! After reading the comments I wouldn't be surprised to see you walking bow-legged so your thighs don't rub up against them! Owwww! They must be black and blue! And swollen!

Best regards - Al  :)
Parent - By welderbrent (*****) Date 04-30-2009 18:59
I think you guys scared him away completely.  He won't even come back and post the pictures now.

Oh, Jim.  Where fore art thou Jim?  And where are the pictures?

Have a Great Day,  Brent
Parent - - By Jim Hughes (***) Date 05-01-2009 12:43
Sorry about that. :) I tried to attach the pictures and could not. Should have deleted my post. I don't know what the problem is lately. I can not attach pictures. Any ideas?
Jim
Parent - By Lawrence (*****) Date 05-01-2009 12:48 Edited 05-01-2009 12:59
Jim,

It's a proven fact that it takes 2 or 3 engineers and an IT specialist to make a piece of technology work when somebody is looking or people are waiting  :)

Remember the powerpoint at that staff meeting?    :)

Keep trying  ... You really have us interested.

And during this time of intermission while Jim gets his technology sorted out; I shall happily provide some entertainment... On the topic of ................Engineers

Close project coordination. (We met together and had coffee.)

Years of development. (It finally worked.)

We'll have to abandon the entire concept. (The only person who understood the thing just quit.)

We're preparing a report with a fresh approach. (We just hired a couple of kids out of college.)

Preliminary operational tests proved inconclusive. (It blew up when we flipped the switch.)

Test results proved extremely gratifying. (Yahoo! It actually worked.)

Please read and initial. (We want to spread around the responsibility.)

No maintenance. (If it breaks, we can't fix it.)

Low maintenance. (If it breaks, we're no likely able to fix it.)

All new. (None of the parts are interchangeable with the previous design.)

Rugged. (Needs major equipment to lift it.)

Robust. (More than rugged.)

I haven't gotten your email. (It's been days since I've checked my email.)
Parent - - By Jim Hughes (***) Date 05-01-2009 13:15
Well folks, I tried to attach the pictures again and failed. :( Realy what I was trying to do is strengthen your imaginations, and by some of the replies I believe I have succeeded. :)

Jim
Parent - By Joseph P. Kane (****) Date 05-01-2009 14:20
You have been a good sport in this!
Parent - - By swsweld (****) Date 05-01-2009 18:32 Edited 05-02-2009 04:43
Hey Jim. The pics are up. Do you know what the problem was? I tried to post pics yesterday and could not so I deleted my post. After all the smart a**** responses by this hostile crowd I wasn't about to go through that :)

On the subject of arc strikes, the PT shows why they should be avoided. Especially with certain grade materials. Good lesson.

For a nominal fee I can provide instruction so your vendor can turn out welds like these.

Parent - - By Jim Hughes (***) Date 05-01-2009 20:04
I can take no credit for these pictures being attached. My good friend John Wright was gracious enough to help me in my dilemma. :) Thanks again John. The moral of this story is, if you fail to attach whatever your trying to attach.....remember to delete. :)

Other than the arc strike the weld visualy looks good. But looks are very deceptive some times. On P91 material this arc strike would have cought my eye pretty fast. Eventhough this was vendor supplied piping we should have addessed this before we tried to sqeeze the system it's attached to.

concerning the responces to my attachement screw up..... I chuckled through every reply. :)

Thanks
Jim
Parent - - By Lawrence (*****) Date 05-01-2009 20:27
Thats good instruction Jim!

Those photos really bring home the importance of preventing arc strikes

Red dye doesn't lie.

Teacher jokes welcomed  :)
Parent - - By ctacker (****) Date 05-01-2009 21:44
do you have a weedeater?
Parent - - By Lawrence (*****) Date 05-01-2009 23:40
Ok I'll bite

Yes I have a weed eater.
Parent - - By ctacker (****) Date 05-02-2009 03:40
good answer!
http://www.aws.org/cgi-bin/mwf/topic_show.pl?pid=149680;hl=

Thats the only instructor joke I got!
Parent - - By CWI555 (*****) Date 05-02-2009 04:36
Wonder what the logic would say if the answer was "no I let the goat handle it".
Parent - By CHGuilford (****) Date 05-02-2009 12:48
....ain't goin' there!
Parent - By welderbrent (*****) Date 05-03-2009 01:11
Thanks for the follow thru with the pictures.  It makes a very good point when questions arise about the seriousness of arc strikes. (As did some pictures a while back John posted of his test on coupons and a standard coupon bender- Thanks for those.) 

I have used John's several times with welders after I have marked a strike for repair and they question the reason for repair.  I will add this to my personal collection of stats.

Hope you would have eventually posted this even if you had deleted the original post when you ran into problems with the pics.

Have a Great Day,  Brent
Parent - - By Joseph P. Kane (****) Date 05-02-2009 13:50
Tim 
Nobody was really hostile.   It was just too good a situation not to throw a few good darts at.  Be a good sport about it!
Good pictures.  Thanks for the patience.
Parent - By Jim Hughes (***) Date 05-04-2009 11:33
I agree. It was all in fun.  As I said earlier I chuckled through every responce, some of which were quite funny. :)

Jim
Parent - - By swsweld (****) Date 05-04-2009 14:08 Edited 05-05-2009 12:10
Joseph, Jim & hostile posters, I hope everyone knows my comment was sarcasm and not serious. My dry humor is sometimes only funny to me. I was throwing a dart at the dart throwers. I also was laughing at the comments, especially the intermission entertainment by Lawrence.
Parent - - By Jim Hughes (***) Date 05-04-2009 21:10
Tim,
No worries. That's the way I took your comments. All in good fun. :)  I agree about Lawrences comments. I was just in one of those meetings where someone was trying show the power point from He!!. There were a ton of folks with pay grades higher than mine in the room. You could here the theme song from jeppardy playing in the back ground. It happened a couple of days before before I read Lawrences post. I almost busted a gut....

Jim
Parent - By 803056 (*****) Date 05-05-2009 03:49
That's one reason we all return to read the latest posts! A good chuckle and some good technical reasoning.

I for one saved Lawrence's offering!

Best regards - Al
Parent - By Atorroja Date 10-02-2009 14:51
Hi Jim, Huuummm Í´m not sure about the start of the crack is ame from the arc strike. It looks more a controlled pre heat, interpass temperature control, and PWHT problem. The throat of the fillet weld looks to  much. I can not found the crak in pic one
Up Topic Welding Industry / Inspection & Qualification / Arc Strike

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