TIG Welding Aluminum at 50hz vs 250hz
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- Опубликовано: 21 авг 2017
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A more detailed article on the topic of AC frequency can be see here goo.gl/bPkfCt
This video is about tig welding aluminum on AC at 50hz and at 250hz.
there was a noticeable difference at the 2 different settings. 50hz got completed penetration and 250hz did not penetrate.
I tried to keep travel speed the same for both welds by using a motorized welding positioner turntable.
Ck worldwide mt200 ac/dc tig welder set at 90 amps, AC balance set to 6 using 3/32" (2.4mm) 2% lanthanated electrode and 4943 aluminum filler rod. 
Хобби
Why is Jodi the best? Cause when you're trying to learn from the way a scratch effects a weld, you're welding at another level then everybody else.
I enjoyed this video. Seeing the scratch float on top/sink to bottom was wild and seeing the weld puddle glow are two things I have never seen before.
Backside view was really cool!
Jodie, that film of the bead from the inside was awesome! I never had seen that before, thanks!
Dude I love your channel. I've learned so much from just watching a video or two every so often. Your a amazing welder. Props man.
Great Video! Really interesting how that scratch moved and great view of the backside of the welding. It was cool watching the bead sink down!
How on earth can anyone give this guys videos a thumbs down ?? This is without a doubt the best welding channel on RUclips.
My thoughts on the scratch, they may be obvious though.
The scratch is in the oxide layer which is not broken down as would normally happen as the cleaning action is on the other side. There's not enough heat to melt it the oxide so the molten unoxidised aluminum just lays up against the oxide film and pushes it down but it stays intact.
Might be completely off track but that's my theory.
This was going to be my guess as well. Another thing I was wondering was if that oxidation layer also protects the weld so it doesn't get contaminated from the inside.
Yeah, it must be an oxide film.
This was my thought as well. I dont claim to know much but it makes sense that the oxide layer isnt melting forms a loose skin and falling down due to gravity.
D Stirls yes you are correct, it the oxide layer not melting.
Yeah. I'm a newbie but glad I got that :)
I think that old tony also demonstrated the layer of aluminim oxide when showing what happens when trying to weld aluminium with DC. Aluminium oxide is basically sapphire and has a far higher melting temp.
Backside camera, brilliant.
That's the "skin effect" that old Tony was talking about, it's an oxide layer on the aluminum (he was referring to it incorrectly) but That's the exact reason we use AC, is to burn off that oxide layer or "cleaning" on the AC balance side. on the bottom it was helping to cover the puddle no need for purge gas and possibly slightly holding the puddle. Anything that you would weld with ac is the same. When Jody was welding dc aluminum with his friend a while back he said "push the rod really hard to push it through the oxide layer so the rod would melt into the aluminum and not just on the surface". That's why you could see the scratch it was in the oxide layer that since there is no ac it won't burn off. I'll bet if he did this again with 2 pieces butted together the scratch would disappear.
Loved the backside cam angle. Awesome, thanks.
You and this old tony going back and forth on this one
Hope to see more videos from you. Thanks for the tips.
If I remember right, a document (from Miller maybe?) I saw in school stated that higher frequency provided a more focused arc. Interesting to see the difference in penetration! Great vid!
I appreciate the min/max frequency video. I'm trying to weld some thicker aluminum right now and needed this to know the best way to get more penetration. Thank you!
I've never tried tig welding with my everlast welder higher than 60hz. This was very informative
Thanks Jody, wish I watched this video last week. Had a job yesterday where I struggled with my 200A machine to get the heat in.
Thanks for sharing with us Jody, great job with the patching and welding aluminum.👍👍👏🏻👏🏻👏🏻👏🏻
:) Прошу прощения за то, что не столь свободно владею английским ... потому собственно и пишу Вам на своём родном языке.
Всегда, с превеликим удовольствием смотрю и слушаю Ваши очерки о сварке.
Более того, недели две назад "образовалась свобода в действиях" и я поэксперементировал сварку алюминия на различных частотах (от 50 Hz до 300 Hz)...
Ваше видео -подтверждение моих выводов.
Благодарю Вас за всегда качественные, позитивные и понятные видеоочерки!
Здоровья Вам и успехов!
Super helpful insights as always,. Great scientific approach making the travel speed constant and taking other user-variables out of the mix. And hella-cool backside time lapse camera action! I'm with you Jody on not digging the mosquito vibe of the higher frequencies. Gotta say the reminder of the gas lens capability for increased stickout is much appreciated too. I've been using gas lens for a while as a newbie but get stuck in the mindset of the stickout rules for standard lens cups.
1:57 you can almost literally see the heat-conductivity of aluminum in action. Looks to be some surface condensation from the air (on the inside of the pipe) boiling away as the arc is initiated. Pretty cool.
As always very informative Jody. Great video!
Sir your videos are awesome! I have a tig welder that I have only used for steel but want to learn how to do aluminum and you are a great teacher. Thank you
WOW! What fantastic videography Jodi! You keep pushing the boundaries and are producing the absolute best welding vids on RUclips!
I'm often asked by newbies about how to best start learning to weld, usually Mig but the other processes too. I respond that a beginner must SEE what a proper weld looks like while it's being made. That's what instructors show students in welding school. I tell them that if they're not gonna take welding classes, then they MUST watch your welding videos to SEE what a properly flowing weld puddle looks like. Your vids also fast track their education relative to proper machine setup and material preparation.
Your vids have prepared many newbies to begin welding properly! Congratulations!
Michael (Winnipeg, Manitoba, Canada)
That was cool camera action!
Amazing videos. The new ESAB Rebel EMP 205ic AC/DC 6 in 1 is incredible for welding aluminium. It also has 'independent amplitude offset' feature on AC HF TIG, as the well as the Dynasty 400 (as you know) and is unbelievable with a sharpened white tip zirc tungsten for smaller bead profile, improve penetration, and reduced preheat on thick material. Awesome machines.
That was super informative. I'm going to give this a try with my everlast welder.
Thank you I been watching over the last year or so, awesome info! This is great for a new guy!
Jody - you are awesome ! thanks for all the great videos !
What did we learn from this ????
Easy - that you make the best welding videos ever !
I don't know how you do it but the footage is so clear that i feel like i'm standing right there watching it through my own welding helmet !
I would like to see another video on the stubby cups and maybe some explanation or instruction on how to choose the right cup for the job and things like how too much / too little gas affects the welding process .
Great video, helps me a lot to understand a few of my mistakes , and I love to see your attitude about learning every day :)
Excellent camera work!
Thanks Jody. Scratch was pretty crazy.
Thanks Jody! Another great video!!
Carrier wave efect. EM engineers could chime in with the specific efects and formulas, but the basic mechanism is still: lower frequency (wide waveform) penetrates deeper. High frequency (tight waveform) penetrates less. Easiest way to show the efect: play a song with your stereo and close the door. You can hear lots of bass, but dampened mid-high.
Jody, Thank you for your insight and incredible teaching videos that give us wannabe's hope!!
This Old Tony is an avid fan of Jody as am I. Jody is really the best, especially with his explanation and video angle.
Jody, this is really a great video. Thank you.
Hey Jody- always loads of value in your videos- thank you! You wondered about the alumimium heating to red but thought it might be the arc shining through, In my experience if you cast aluminium and get it too hot it will glow nice and red for you:) Maybe at the heart of the weld pool the puddle is at 700+ degrees C at which point infra red will show up as a red glow. Seems reasonable as we actually need to melt the metal to weld it and that shot is viewed without a darkened shield which is nearly never the case when we look at what we weld. Anyway - just a thought.
great to see the the inside of the tube while welding!!really like it and the scratch thing is cool as can be,have never seen that happpen before..thank you sir and now my thinking cap is on as always😎appriecate it..
Very cool. I also learn a little something from every video you do.
Video of the back of the bead was a brilliant idea. It would also be good for any root pass.
Hi, I’m attempting to learn tig welding for diy purposes and I’m an electrical engineer focused on RF/microwave design. The penetration depth you see versus frequency is due to the “skin effect” or “skin depth” associated with the welder’s AC frequency. The skin depth is proportional to the square root of signal/welder’s frequency. For example a 60Hz signal would have a skin depth of approximately 10mm and 5mm for 250Hz. Of course the current will use all of the thickness if the skin depth is greater than the material thickness but it would then spread out with decreasing frequency. The skin depth gives a limit for the maximum penetration depth/width due to the welder’s current but thermal conductivity effects would slightly increase this depth/width. I find the physics of welding to be very interesting and I hope this explanation is helpful.
Stubby lens kit is great Had mine a while back from Jody Thanks for great Content
Great video Jody.Thanks for the info.
Always worth watching your videos thanks mate very informative and Im a Welder ya never stop learning
Thanks Jody, I really learned a lot of your videos :)
Great video as always Jody, very informative! I have a new video coming out today on helium and argon gas.
Thank you. I’ve been wondering about this.
Thanks a lot. This means so much to me right now
That maybe video of the year right there.
Amazing, man! Good video👍
Frequency is frequency, Lows always travel further than highs,
its that simple,
Think of a sound, same thing, highs are more intense but cant be heard over distance, lows can be heard for miles,
I metal detect, when we use a High feq search coil it does just that, very intense (will find tiny stuff) but wont detect as deep as a low feq search coil (that goes deeper but is not as sensitive to the smaller stuff)
as I said, feq is feq not matter what its used in, it still behaves the same
You are a wonderful teacher and veteran
Cool video. I've never bumped the frequency of my everlast welder past 120hz because high frequency buzzing drives me crazy. It was very interesting to see the effects.
Thanks for another great video!
Your videos are one of my most Favorited..
Good vid. Learned alot. At 250 thats 200 more times a second that voltage/heat is not being applied. Pretty cool and you don't look anything like my dad, but he sure could weld.
Jody the GOAT.👍
50Hz FTW I can still make it look pretty. Excellent video, thanks for sharing.
can you weld 1mm aluminum also with 50Hz? im unable to do so with my 60hz 220 machine.
Neat trick with the camera on the back side there.
Bro your on another level..., thanks for all your help!
hey thanks for the tips and tricks I like the stubby gas lens comparison to standard at the end of this video thanks Jody
You are right on when you said "peel coat". The scratch is on the aluminum oxide which coats the pure aluminum. Aluminum oxide has a higher melting point at 3762F vs pure aluminum at 1221F.
Thanks Jody!
awesome! What I was told - was wrong) less penetration in fact) thank you!!!!
Fascinating video on aluminum welding. Can you also do some aluminum welding videos with the two new Everlast welders. They've got the multi-process welder that can do AC as well as a mig welder that can support single and double pulse.
Aluminum does glow from heat, you just normally don't see it because you're looking through a filter that's designed for blocking infrared, and aluminum is just barely starting to emit visible light before it melts.
Дядька как всегда на высоте, молодец.
Cheers! Handy info yet again :-D
Great work Again thank's for these great videos sir
thank you for this great informations! thanks
Brilliant video
great test. controlled speed.
great video , thanks for the lesson//
Youre awesome jody!!!!
Really good stuff thanks
Great video, thank you
The "some energy lost somewhere" wasn't there to begin with is my guess. There's always some dead time when switching polarity. There has to be or the smallest differences in tolerance of the electronic parts means you got an internal short circuit. Switching tens to hundreds of amps isn't easy to begin with and since there's not really a need for very fast switching times here I guess they didn't go overboard with designing it for that. There's also a physical limit of how fast the current can change in a setup like this, even with perfect ideal components.
The dead time per polarity switch is independent of frequency (I'd really like to know how long it is, my estimate a few hundred µs per switch), which means at higher frequency you got more total dead time (5 times as much at 250Hz than at 50Hz). *Interesting thought:* you could turn up the current at 250Hz until you achieve the same penetration that you get at 50Hz. The difference in current should tell you how much difference in total dead time there is (assuming dead time is the main effect of different frequencies).
Great observation! I am sure you are right about that- Thanks for the comment!
VERY nice video!
@5:39 when you apply for a welding job, wage range is from $20 to $50/h
left: $20/h
right: $50/h
😁
Great video jody👍👍
나의 스승입니다. 많은 것을 배웠습니다. 감사합니다.
Do I get the feeling this vid was kinda for thisoldtony.
Buena maquina, tienen proveedor en Colombia 🇦🇲 Cali, saludos cordiales
what you can learn from the scratch is that the only thing preventing you from blowing straight through that tubing was the aluminum oxide layer
You are the man thank you
Very interesting. I'm thinking about getting an everlast welder with advance waveforms. Please do a video that compares the various waveforms.
BEST WELDING CHANNEL EVER!!!!! Any advice you can give for being stuck with a fixed ac frequency, and how to get around welding thin stuff about 0.8mm? Maybe pulse? By the way, tig finger plugs are annoying, but at the same time quite possibly the most brilliant invention in the world. Cant imagine life without one. tiny parts heat up fast, and incredibly super-hot, its at the time when you need to prop at an awkward angle on that tiny super-hot part, that makes you appreciate it. Thanks man...
Naren Somaru Chill bars, really tight fit up with no gaps, and fast travel speed. I bet if you go on Jody's website and search for chill bars, you'll find a video that'll help you out, I'm pretty sure he did one a few years back that goes over just your situation.
Thanks, yeah, i remember that... Now i know why i kept those two pieces of copper.... Hey Jody, how about making a full glove out of the same stuff like the tig finger? but maybe thin felt inner lining? i bet those would sell like crazy, especially considering i really need something like that, for both hands too.
Looks like a new sequel to the Tremors movie. Aluminum worms
Like the underneath shot, can only see that when you're watching somebody else. Maybe.
Welding over 40 years and still learning new things. My machine doesn't have frequency altering but still good to know anyway.
In case I get ahold of one I'll know what I can do with it.
Just getting started on aluminum welding and could only afford a 60 hz machine with 200A max at ac hopefylle going to be able to work with it!
Great video.... Thx
My guess for the behavior of that scratch; the inside surface has all oxidized, as all aluminum does, and that aluminum oxide has a much higher melting termperature than the non-oxidized aluminum inside the wall of the pipe. That's the reason you have to use AC for aluminum, it blasts that oxide off the surface you're welding. But on the inside, without the arc, that thin oxidized layer stays solid and just kind of floats on the surface of the molten weld pool. So the pattern of the scratch, all visible parts of which have at least a tiny layer of oxidiation, just stretches as the weld pool comes by.
Beautiful behavior, I've never seen that kind of thing happen in real time. Something you would probably never catch without filming while welding on a single piece of aluminum.
Not to be contrary to someone that knows so much about welding - but aluminum does glow when you heat it enough. Incandescence starts @500c
I see glowing orange ( slightly ) aluminum quite often . Usually thin stuff
very interesting and informative jody. i would have like to have seen a comparison of 100-120hz thrown in. that seems to be where machines with no freq adj are set.
I’m walking aluminum intercooler pipe. I just blow past. Using 65 current. And low frequency and medium balance. Should I go to high frequency to lower heat?
Hey Jody, are you going to be able offer international shipping on your CK torches anytime soon? Ready to make a torch upgrade and I'd like to pass on the business to you.
Thank you
Hi Jody. Could you please do a video on AC/DC hybrid wave compared to just AC at both frequencies and the same amperage as used here? I would be interested to know if it is a worthwhile feature to have for improving penetration with a smaller machine.