How to Remove Mill Scale and Prep Pipe for Welding (amended)
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- čas přidán 20. 08. 2024
- Stop grinding and start welding. The flux on those welding rods are bad to the bone. It will float contaminants and mill scale away. Your first pass won’t be as nice as your second pass. But we don’t wild anything with one pass anyway usually.
What should a young welder do coming out of school. Tips and tricks on showing up on your first day. And what is expected from the older more experienced welders.
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One of my favorite videos! 😂 Solid Gold
What an honest dude to put his wrong explanation in the video then amending it. Got a sub from me.
Mill scale is iron oxide. Also known as rust. No one calls it rust, but that's what it is. Orange rust is also iron oxide. People seem to wrap their head around that. But orange rust and mill scale are both iron oxide AND rust. When steel turn blue or purple or brown, those temper colors as they are called, that is iron oxide too. The black slag left on steel after being torch cut, yes that is iron oxide too. All technically forms of rust. I am an engineer, not a chemist, but I do have some knowledge of metallurgy, and steel oxides are a part of my interest. A point of note, is that rust and mill scale (iron oxides) are ceramics. Yes like coffee cups and flower pots. Iron oxide does not conduct electricity, is non magnetic, and has a different thermal coefficient of expansion than the base steel, and is very brittle. You can use this property to your advantage when you have stuck assemblies that are rusted. You know hitting rusty bolts with a torch breaks up the rust and allows you to loosen them. This is because the steel expands, and the rust does not (relatively speaking), and during the heating process. The rust gets crushed by the expanding steel, and the rust is weak and brittle, so it gets pulverized and crushed. This is why heat from a torch loosens rust bound bolts. Something to note, not all oxide forms of metals have the same properties. For instance, silver is used to plate electrical contacts. The reason for this is, the oxide form of silver has nearly the same electrical conductivity as pure silver. Makes for good switch contacts. Anyhow, I just wanted to give you some more information about mill scale. Yes you are right it comes from the mill rolling process. But to know about mill scale (iron oxide, rust, etc) is such a deep subject, and if you deal with it in your career, knowing more about it is going to be a benefit. I enjoy your videos. ---Doozer
thanks dozer. That’s a lot of information.
yeah and its often soaked in oil too
Thanks for the info.
Fitter told me if I couldn't make x-ray without him grinding mill scale grind it myself! I haven't worried about it since! One of the best guys I ever worked with!
Economic Ninja sent me! I'm also a welder but can definitely still learn from channels like this.
I learn something over day buddy. Thanks for coming on
If I can't get a grinder in I use the end edge of a file or even my tungsten scribing pen to cut through the rust to start it. two passes (even with mig) and it works...this is such a good video dude
I can vouch for not messing with millscale for general fabrication be it a frame hitch to stretching a truck frame, the only place I was required to prep a plate was in the Navy at high pressure plate welding school I went to, they tested the crap out of our coupons to get certified, four years later I get out and back into the fab/repair business and never removed scale, wasn't needed, now I did sandblast it when a job required a good painted finish like railings and ended up building a sandblasting box (not a booth, an actual box with several nozzles in a box about 60" long and big enough to run a 12" H beam through) that we ran lengths of stock through to prefinish before sawing and welding up the project, was a huge time saver in not having to position a completed job to be blasted, just weld/degrease /paint. But if code requires prepping then" let it be written, let it be done". 😉👍🏻
As a ironworker structural welder we don’t have time to sit and grind every single weld all day we need to weld and weld no time to stand their with a grinder
I heard that that was my first job was ironworker welder
Great info! I was raised on stick/MIG....but also got into TIG to support my machining habit- Looks like a dandy lathe behind you....
Thanks!
That’s cool Robert I don’t get to use the lathe much. But it’s fun when I do get to. Thanks for the comment
Very practical!
Lol! I started watching this video this morning and I almost posted a comment in regard to what you said about the mill scale. I was typing the comment and then I stopped because I never posted a comment on your videos before and I didn't want to start out by attempting to correct you. (I've watched some of your videos before on my phone and just started on my laptop today and subscribed.) I got back on tonight now to watch the video again and saw your edit about the comment from the "inspector" in regard to the mill scale, lol! Good videos.
Thanks brother! The guy that told me about it was not very kind. The mill scale grinders are coming out of the wood work
Couldn’t sleep so before class decided to rewatch some videos somehow have missed this on but I always learn something new even tho I already watched it 😂😂. appreciate it your videos I can do way more welding in the booth now
Came over from Economic Ninja. I’ve always wanted to learn to weld. I’d love to learn a new trade.
Thanks for coming over. Everybody needs to know how to weld. Even if you don’t do it professionally
Great video and channel! I will be showing your videos to my students, thanks for the content
That's means a lot and thanks for the comment!!!
you might wanna remove the millscale when taking a plate test tho, the inspectors like that
You gotta do what they want that’s for sure.
My first watch on ur new channel- i can see im going to love it! Thks chris
Thank you John boy
Talking about Chinese steel couple months ago at my brother's shop in L.A. we got some Chinese steel not even Dawn dishwashing liquid combined with purple cleaner could remove guey black stuff
I hate working with that nasty crap
Acetone takes it off. I get metal made here that has dirty black oil from the mill. Pretty common, actually.
came across your channel and subscribed, like the way you try to encourage people into welding , i’m a home hobbyist and minor repairs with my small rig , can’t wait for other videos
Thanks for watching and going the extra mile and commenting. Everybody needs to know how to weld. It’s cool you got a rig
When I was taking welding class they told us to remove the mill scale because it’s not good for our health. When we had topics on tig they would recommend us the same thing but to also prevent porosity. Some of the other guys would use the round tip for the grinder and heavy grind the inside of the pipe. I found that a waste of time I would just give it a quick pass or use a file.
Subscribed to ur channel not to long ago. Great topics your videos helped motivated me to find a job in welding. Can’t wait to find one. Any tips on where to start or how I can get my foot in the door. Also how do you prepare for a pipe test.
Shut downs is a good place to start. And as far as the welding test just practice. Every day for about 30 minutes a day
a while ago i saw someone attack the mill scale for a couple of hours with diluted vinegar, its slow but in the end you can just wipe the mill scale off. it seems to be a good idea to just prep all the pieces beforehand
Welding over mill scale has no negative health effects. The smoke from the welding process is not good. But adding mill scale to the mix is not going to add to welding being more hazardous. Grinding it and breathing grinding wheel dust, for sure is no good for you. But telling the class mill scale is not good for your health is flat out ignorance. It might not be great for the health of the weld, but that's it. It is not like welding galvanized, which is really bad for your health. --Doozer
yeah it has oil in it your burning oil and possibly sulfur compounds @@kooldoozer
@@kooldoozercan you talk a little bit more about galvanized? What is it, why is it more dangerous and how often would i see it in the welding industry?
After i put a land on a pipe i use a file to knock the burr off the inside to see if my land is what i want it to be i dont anymore cause i can tell as soon as i grind it what it is but thats why guys do that it aint about cleaning it
When I started I used to do it as well. But like you said with experience you don't have to anymore.
Thanks
Mill scale 😅 try welding through galvanized , checking in from southern Califa local 433 IW
Galvanized is a bummer
You ain't kidding, I've had some galvanized jobs lately and I hate that stuff. When I see that blue spark, I die a little inside. 😆
@@gillihansmobilewelding make sure brother wear a respirator for you don't get sick and poison that s***'s no joke
Electro galvanized is ok but that hot dip stuff is hideous! Either grind it off or use hydrochloric acid,don't forget the PPE!
If the weld is important remove the millscale just beyond the toes of weld area. Especially with slow freeze rods. Ideally you don't weld through mill scale. Run two 7018 beads on the same metal one on top of mill scale and one on shiny metal. The 7018 on shiny metal always looks better because it is. If you weld pipe or structural those welds are important. Those jobs pay good and you need to be professional and make sure you are welding professionally. There is a certain amount of Flux on those bad boy electrodes and therefore they can only clean a certain amount of contamination from the molten metal and float it to the slag layer. In some cases halfazz removing the mill scale or leaving all of it on is too much contamination and hello porosity and internal defects.
Lol
They come out shitty cause you don’t let’s that pool build up not cause of the milscale
@@calebc6028not true. Mill scale does cause problems. Yes, you can weld through it. You can weld through paint and rust too, but you shouldn’t.
Hello Sir! Is the first time I'm hearing putting butter in the coffee, can you please give me the recipe and how you make it, thank you in advance
Just put a tablespoon in your coffee and whisk it in with a milk frothier. Fast till lunch. Warning it’s addictive
@@TaylorWelding thank you
Been welding for 20 plus years. Only problem I’ve had with welding mill scale is these wanna be QC guys calling it under cut , especially when the scale is thick . Ever had issues with that Taylor ?
No, not that I can remember
@@TaylorWelding i imagine the plant and pipe line work is a bit different
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Why then does every weld procedure I've ever seen, be it AWS or ASME, the very first step is.... you guessed it... remove the mill scale? 40+ years experience, and built all types of machines, heavy gas and oil related equipment. Higher chances of contamination and lack of penetration! Ask yourself this.. how would you feel if someone got killed because you took a shortcut!
Are you a professional Welder?
Is that what you do for a living?
What do you think the flux on that rod is for?
@@TaylorWelding I was for 40 years. Flux on the rod is for minimal cleaning and to protect the molten filler! Not for eliminating mill scale.
and mill scale has oil in it too, or heavier greases . and carbonates . not hard to imagine sulfur either because that shit is in machinery oil. try disposing it officially you get all sorts of weird enviromental shit, its not considered iron oxide pure @@johnhudson5947
The best grinders are welders.
This is bad advice. The millscale is not ok to weld through. If you're using stick sure itll get through it. Mig or tig, absolutely zero millscale whatsoever.
Lol! OK I’ve just been doing it my whole career successfully. But whatever Josh.
@@TaylorWelding lol ok.