🔥 How to Make Weld Repairs that Pass X-Ray (with ESAB Rebel 235)

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We get questions on how to repair different types of weld defects, whether it be slag inclusions, undercut, etc. In this video, we will be showing you a students weld that has both of the aforementioned defects and how to repair them. But to make it all the better, we are going to show you exactly where the defects are with an X-Ray from the NDT department and the finished weld will be shot again to show the results.
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[@ecr125x]

No other video like this on KZbin, thanks Bob!

[@spacystacy51]

thanks for sharing your time experiences and videos with us looking good. when I see your videos you remind me of the welding instructor that taught me. he was a good person not a lot of people a skill that they can use for the rest of their life. I am thankful almost everyday for that life-changing skill that he taught me thanks for sharing.

[@StreetBikeTakeoverYT]

Gotta say you have the clearest welding shots I’ve seen so far on KZbin 👍👍

[@tonybaggett1984]

Just another awesome video! Being an beginner this is way outta my league but it's great to watch. Bob your a great teacher keep up the great work!

[@ls2005019227]

VERY informative video! Being able to test/correct in this way would absolutely improve skills. Thanks!

[@rahimshaikh3296]

thanks man your videos are really helpful got to learn a lot of new stuff.

[@Freshwaterfishkeeper]

Good honest video 🤘🏼👊🏼 if you do enough X-ray quality you will run into this! Great clean up bob

[@camacho1234]

Good to see the actual developed xray, would love to see more NDT videos like this

[@charliespann3967]

Huge help, Thanks for another great video.

[@ronsites2694]

Thanks for another great video. I don't expect to ever be that good but it is nice to know information.

[@Lakshman588]

You guys did Great Jo. Good informative things are explained in this Video.Thank you very much both of you guys.

[@yourweddingdance]

This is a great video. Thank you, Bob!

[@bradennoe7815]

Right now I’m doing 2 inch 6 g tig and I past a strap bend test on the first try it was pretty good

[@r.j.sworkshop7883]

Thanks for the video. I have never seen the X-ray process for welds. So this was very interesting to see the image and what is looked at during the process.

[@krissullivan593]

R.J.'s workshop he’s a moron.

[@rad9693]

I know old Bob he'll of a guy, cool video. Back in the day he could make a repair where you could hardly tell.

[@dicelabiblia7461]

Great video, great content and a great teacher, thank you

[@er100sg]

I'm gonna make a repair like this inside a tank next week and hope will be good :)

[@mikeschmidt7980]

thank you for this vid, learned a lot

[@bartoszbarejko1585]

Greetings from Poland.

[@Daniel-yb7wj]

8:21 i recognize that shockwave you got in your back. Bad posture to instant good posture and maintained it without choice. I get that alot.

[@TheDustyShed]

Yep. The truth is most computer monitors are positioned approximately 10 inches too low. Raising the monitors give you a natural tendency towards better posture. The bottom edge of the monitor at shoulder height will be much safer for back and neck health.

[@electrolightsd]

Prep and super clean stainless.. makes me get every xray ..and then comes welding skill. and every stop you have when welding you need to have that restart ready and clean from root/ hotpass to cap.. boom

[@magnusklahr8190]

Great video!!

[@shanshiwanka9452]

Superb videos Thank you.. Thank for letting us see this.. we are 🇱🇰 🤜🤛

[@juniorgamer2011]

Very good amigos 😆

[@alexanderpazkowski1405]

Anyway you could share what type of camera set up your using for those GTAW video shots?

[@PeakyBlinder]

Can you do a list of all the sayings in welding and the meaning, Is I.e undercut = when the weld is not level. You come out with so many sayings it would be good to learn them all. Thanks.

[@kevbell5346]

In a normal repair situation the radiographer should give an estimate of the depth of the defect to give some idea of how deep to excavate. After reaching that depth and after chasing any exposed defects the excavation should always be given an MPI inspection to ensure all the defects have been removed. The prodes MPI technique is the most reliable method to use to find defects at the base of an excavation, i.e. better than using a yoke type electrode magnetic. Inspecting the excavation using MPI prior to re-welding makes economic sense - why risk having to repair a second time for the sake of a quick MPI? Great to see NDT being explained and demonstrated on KZbin along with all the other great welding videos that you have covered - I hope you'll continue to help welders with this very educational material.

[@kyletrader9223]

You cannot get depth from an x-ray without doing a zero° shot and then an offset shot, then running a calculation for it. Unless you are doing RT on 2" pipe and under (likely superimposed technique due to having 3 images) you wouldn't be in a position to do such a calculation. Doing a contact shot (any piping over 3" up to 12" if you cant get inside of the 12") there is no reasonable way to determine depth without performing profile x-rays as a superimposed technique and calculating based off of that. The problem with doing all of that is that it would take more time to determine the depth than it would to have already started repairs on the weld. You could also get an estimate of depth from a normal zero° image due to where the defect is in the weld. If it is in the center of the weld then it is unknown, but normally in the root. If in the center of the root and hot pass but not on the bevel then it is likely the hot pass, and further off to the side it's likely in the cap. That is usually how it is determined how deep the welder needs to grind. I hope this was able to help you out in some way. As an RT technician I take pride in my work and I enjoy educating workers on the technical side of my trade

[@kyletrader9223]

Also, not all material can be tested using MPI. As well as the time and consumables used to do MPI would be more costly to the client than letting the welders grind possibly further through the weld and have a clean repair, then pass x-ray. The most cost efficient solution I can think off at the moment for reliably determining if the weld is free of the defect would be to shoot a profile x-ray on the weld using a digital x-ray system (if the defect is large enough to detect on a less sensitive medium). This is due to the speed of digital x-ray being near "real time" to get a result compared to an hour or so for conventional film, or up to 30 minutes for the type of medium used in the video shown here. I hope I was able to help

[@asplab9956]

well done Bob

[@johnbladykas4454]

I like the video you did. Outstanding work showing a process very few get to see What college is it you teach at

[@jdvmusic3949]

I'm looking for a x-ray or any vision inspection machine to measure welded parts to GMW14058 Weld acceptance criteria, any suggestions?

[@ilangkumarkumar377]

Great stuff

[@never2be07]

Even if you know how to burn it's good practice to grind your start, stops and restarts. That's where you will most likely get porosity.

[@jeffmay1332]

Great video Bob. Do you see it that clearly when you are welding as is shown on camera?

[@bobmoffatt4133]

Yes. Always keep clean lenses in your hood. Always!

[@Len_M.]

Bob Moffatt What would be the Cadillac of Helmet to put those Philips AlloWeld Gold lenses / Magenta filters in? I'm guessing no one has a comparable autoshade? My current helmet is a Miller Elite.

[@bobmoffatt4133]

Len M. Man you got me. I would say whatever you're comfortable with. I like the auto dark I'm using now.

[@Len_M.]

Bob Moffatt Yeah, I love my auto darkening helmet too. I suppose we're never going to get as good of view as the camera without sticking our face in the pool. Haha. Maybe they'll make a helmet with a side monitor and torch with a camera on it in the future! I've been getting a yellow tint put on my RX safety glasses and I find they up the contrast of the weld pool compared to clear lenses.

[@donaldinnewmexico]

Hi Bob, When did certifications allow grinding and rewelding? All my certs were one chance with certifier observing. Thanks, Donald

[@hockey3t8]

Donald in New Mexico it's to represent a field repair on a weld not a cert test

[@donaldinnewmexico]

Hi KM, That would make sence. Thanks, Donald

[@youcanthandlethetruth6976]

Was that a cutting disc, or a grinding disc on the angle grinder?

[@BurgerFlippinBeast]

Robert Elliott 1/8 inch grinding disc. Grinding with a cut off disc is a quick way to get that puppy to explode. You can get away with a little bit. But it’s not recommended.

[@lambchops432]

hey bob! im from southern ontario currently a apprentice fitter/welder! im a big fan of this channel and ive taught my boss a few tricks ive learnt from you! i know this question is off the topic of the video but how would you go abouts doing a root pass on 1 1/2" carbon pipe with a 1/8" bevel and a 1/8" gap with .035 mig i previously welded them in one pass with good pen and no pressure leaks. its for a water bypass system but the new bossman wants a root with a cap now. Also i do use rollers

[@bobmoffatt4133]

Ho man, I'd have to trial run that. I'd probably go at it with .023 wire first. I'd try up around 10 o'clock with pipe turning away. 2 passes. Then I'd go to .030 wire. I'd be a little nervous about turning .035 down that far. What kind of machine are you using?

[@lambchops432]

Bob Moffatt im using a deltawelx 452 i used to do them all in one pass 21v 350w in the posistion you recomended with good pen but i tried it the other day with a 2 passes and i had to do alot of grinding! lol hard to keep that puddle small with .035

[@bobmoffatt4133]

Indeed it is. Why not one pass it if was successful?

[@lambchops432]

We have a new boss and everything has to be done his was or the highway kinda deal..it took me alot longer to do it this way but hopefully he will relize he is wasting a good buck. I couldnt find ANYTHING online on folks doing a root and a cap with the pipe im using! I would almost rather do it with tig if he is willing to spend that much more time welding these. Atleast id save some time on the cleaning! Lol

[@bobmoffatt4133]

I'd be inclined to do them with tig myself.

[@danielhocking5922]

Hey Bob, Any tips for a young welder still in welding school for passing an open root mig in flat position

[@lenjohnson4574]

Inkathu Welds practice practice! use a LN 125 w/232 wire 19-21v once you can weld with that you can mig weld anything

[@micbanand]

I would make a little nose and 4mm between. mig/mag in generelt, by my experiense newer go under 4m wire a minut . in position a I do push in c shape. if to hot keep still in the sides, never go back on weld. Hope that helps :)

[@danielhocking5922]

Thanks for the Help guys! Will take it all into consideration!

[@valken666]

MIG vaporizes metals, and anything you breath will never come out of your lungs. If you don't want to be coughing like Bob and me, then use a proper respirator.

[@TheOneAndOnlySame]

No info on the depth position of defects ?

[@guspritchett7024]

I would like to you do a open root stick welding with 7016 welding rods

[@wheels.and.wrenches]

Gotta run a root

[@scotteverett9201]

use a tiger disc to dig into weld it will let you see the slag,porosity ect a grinding disc will dig it out before you can see it so you'll go too deep or deeper than necessary.but if you gotta go thru to the bead well it's zip disc time.

[@wheels.and.wrenches]

Can't grind into a weld with a tiger paw. You can't use the edge

[@glennwest4438]

@@wheels.and.wrenches yes you can. do tend to be wider though. use a tiger paw on thick weld.

[@randalljames1]

Wouldn't it be possible to just go back over a weld and pull an inclusion out by just by going back over with the TIG and rewelding?

[@joshuajones1319]

Possibly if its at the surface.. Needs to be grinded out and removed, then go over.. Most important, never weld over cracks...! They absolutely need to be removed. The heat from welding some times make indications worse..

[@nadiyabegum5091]

Good

[@RenatSavi]

hell yea.

[@59wargear]

So where is your school located?

[@eugenecosentino392]

Awesome video again. I will be going to a UA program soon for my local pipefitters union. This is the kind of test I have to pass on 2" sch. 80 in stick and Tig. Already can do a 6 on 6" sch. 80 in Tig . Will there be any 2 " sch.80 in either stick or Tig coming up? Thanks again for the great video!

[@bobmoffatt4133]

Eugene Cosentino We did a video of just that. Tig root, GMAW cap.

[@eugenecosentino392]

Bob Moffatt I will check that out. Thank you!

[@crunch9876]

Eugene Cosentino yea it you don't pass a UA weld there's no fixing it lol first one may be a warning but then your sent back to the hall

[@bobmoffatt4133]

True that!

[@ShellFitter]

Are you talking production welds in the field or WPQ tests? Because you don't want to know what the UA steamfitters reject rate was on our recent crude tank replacement project, as President Trump said " Sad..." Everyone busts x-rays, we are humans using our bare hands to do surgical work. If you don't bust x-rays at some point, you are doing one of three things: not welding, your company is cherry picking the RT's, or your putting Benjamin's under the ribbon. The welds people bust are the ones where they say "that weld went great, I don't know what happened??".

[@MrThenry1988]

How often does a guy that welding pipe get one kicked?

[@user-im2pc7di4q]

Привет из Сибири! Исправил или нет сварочный стык!?

[@ohshucks7156]

Gotta have a steady hand,,and look at the puddle not,the arc

[@anandchauhan2967]

sir please tell me mig allumuneam walding from sheet amarica standard joint 8mm to 30mm sheet in the sall prasser 8kg hanshan Machin sating please tell me

[@thomaswright5100]

Aluminum?

[@sethrosellini3576]

Hey Bob, always enjoy the videos, still wondering if you could do a video tig welding some sch. 10 stainless steel pipe. I do a lot of backfeeding on carbon but I've struggled with the sch. 10 stainless. Thanks. Backfeeding or laywire, whatever u prefer. (I asked u a couple of months ago and u said u would, figured u might of forgot)

[@Welddotcom]

It's on our list. We do episodes in the order they are requested. We didn't have the right material to do this in the last go around, but we have it planned for sometime in the near future.

[@sethrosellini3576]

Weld.com Ride on man, ill be lookin for it, keep up the awesome videos.

[@Welddotcom]

Will do. Thanks for watching!

[@rareform6747]

Dead pixel like an artifact in old style films ?

[@ohshucks7156]

Liquify ,,,solidify...liquify,,solidify

[@senuolicak7097]

i hate doing repairs...i just do

[@bobmoffatt4133]

I hate doing somebody else's repairs.

[@joshuajones1319]

And x-ray tech's hate shooting the same weld over and over... Just understand that xray guys are not trying to punish u. It's a team effort for a quality product..!

[@anandnarayanan8433]

Defects? Not today!

[@fascamaro]

I wouldn't call them defects, better called discontinuities.

[@durgeshkahar6919]

I'm weldar

[@wheels.and.wrenches]

You not speller

[@goatsinker347]

X-ray images are as blurry as big foot photos

[@yrun989]

👉🤒😂😷🤣 QA/QC

[@slit4659]

If your weld passed X-ray why are you Repairing it ????

[@valken666]

You ruined your lungs by not using a respirator.