What is Welding Inductance and How Does it Affect your Welds?
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- Опубліковано 10 вер 2024
- Inductance is a welding parameter on newer MIG welders that many welders are not familiar with. In this video we are going to talk about what it is and how inductance effects your weld puddle.
We almost finished out welding parameters series last week with the explanation of wire feed speed. However, we had multiple emails asking us about what inductance is and if we could explain how if affects the weld, so that is what we're going to do.
So what is inductance you ask? Here is how Google defines it: In electromagnetism and electronics, inductance is the property of an electrical conductor by which a change in current through it induces an electromotive force in both the conductor itself and in any nearby conductors by mutual inductance.
Unfortunately, for most of us, that tells us little to nothing about what it does in the weld puddle. In this video we are going to give a definition for inductance that every welder will appreciate. You will see exactly what the inductance settings does as we make three welds using difference settings and showing the cut and etched welds at the end.
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I had looked into this in a more technical was some years ago because I was working for a robotics company and had to teach robotic welding classes on a fairly regular basis. Belive it or not, I USUALLY had more trouble teaching experienced welders and engineers, than I did total newbies. The newbies listed better and had no habits to bring into the training. Welders usually wanted to weld too close or weave when it wasn't necessary. Engineers wanted me to prove everything I said, rather than learn. At least that was my experience.
Anyway, some of the welding machines had inductance and I knew that increasing it softened the arc, but I eventually needed to be able to explain why. If memory serves me right (it's been about 20yrs), zero induction is at the extreame end of the CV (constant voltage) spectrum, while higher inductance moves the machine more toward the CC (constant current) end of the spectrum. By the way, 100% is an arbitrary number because you could theoretically keep adding inductance. 100% is based on the max amount for that machine. As you may know, CV is usually related to GMAW (MIG), while CC is usually related to SMAW (stick) and GTAW (TIG). I'm also not saying that at 100%, you are welding with a purely CC machine. No, at 100%, you're welding with the max the machine will let you go toward the CC end of the spectrum.
I really love and miss my old Hobart MIG, it had inductance control and slow pulsing with seperate on/off timers. Not pulsing like machines do now, this was for stitching. You might set it for 1 sec weld, 0.5 sec off. With that, you could penny-lap and make it look exactly like TIG. More importantly, you could weld very thin metals (22ga MS) with no problem.
Paul, I will start by saying that your videos on welding fundamentals are straightforward and easy to understand. However, this video on inductance is correct on the back end but reversed at the beginning. Lower inductance allows the wire to heat up faster, higher inductance inhibits current flow and causes your wire to heat more gradually. You explain it correctly after welding (Zero inductance=more spatter, 100% inductance =less spatter). At the beginning however you explain that phenomena in reverse order.
Excellent explanation. He explains what is actually happening, rather than just saying how the weld looks, which is what most explanations do. I always try to explain what is happening when I show how something works. It’s always better for people to understand the why something is happening rather than just the results from varying settings. That way, it’s easier for them decide what to do, and how to identify what’s happens when problems occur, and how to fix it.
This man seems like such a great person to learn from. You can tell he has a kind soul and seems really interested in you learning and understanding what he's teaching. Thanks!
Actually inductance, in any circuit, opposes any changes in current. Therefore, it "slows" the rise of a current when wire creates short circuit, and "adds" some voltage at the end to keep current flowing. That "slowing" of the short circuit current causes wire to heat slowly instead of bursting apart like in pure short circuit.
What you described, "arc on time" would be an effect of discharging a capacitor, basically the opposite of inductance.
LOVE that quench tank, tried to get one at welding supply store, they said they had never heard of one.....I use one I found at HomeDepot now and it works great for cleaning paint brushes and rollers, looking for other things I can use it for.....we miss seeing you Paul, always loved MIG Monday, cheers from Florida , Paul Brown
Love the quencher!! Who knew? All kidding aside, I now understand the meaning of inductance. Less spatter at 100%. as well the penetration and HAZ on each inductance setting, from what was visible to me.
I see people washing dish on that, but is my first time seeing someone cooling metal on that! I love your videos!
this man explains difficult things in a simple manner
Good video. Very educational. Although I'd say from the macro's that the main difference would be the heat affected zones.
My take away is to run as high an inductance as you can get away with! Thanks needed this info for the future.
I just purchased a welder with this option. Thanks again for your help and explanations
Thank you for this excellent video.
About quenching: back home In France a I had a old blacksmith as A FRIEND, HE USED To OPEEE IN A BUCKET IN HIS SHOP AND THIS IS what he used to temper the chisels.
He said that he salts in the pee were good to temper steel.
Thanks for taking the time to make this video Paul. Good stuff!
Great video. There is no replacement for experience.
Thanks Paul, always look forward to Mig Monday.
Very useful information. I will try out a few inductance settings on my everlast welder now that I know what it is doing!
Hmm... Definitely see the difference in bead profile.
Noticed more splatter at 0%, but at 100% I was surprised to see as much splatter as there was...
Good video!
Not quite correct, inductance controls the rate a which current rises. Low inductance allows to current to rise very quickly whereas higher inductance allows for a more gradual current rise. Too little inductance and you'll be delivering full current to the electrode almost instantaneously, this will cause the wire to "explode" more violently, hence the spatter. If the inductance setting is too high, it'll take too long for the current to rise and you'll end up stubbing the wire before it has a chance to melt.
1n5ane1 so is this the same as arc control?
Are you Russian?
No its not one way its both any change in current through a conductor causes electromotive force change(voltage). In fact this rise in voltage (when larger/higher inductance) changes the balance of voltage to current more (temporarily lowering the current while voltage rises) this would increase arc length available so also arc time since the conductor is constantly approaching circuit completion.
Very helpful. The comments also helped
Keep up the good work
Yes, di/dt=v/L. Rate of change of current is inversely proportional to inductance. Voltage is held constant in a GMAW machine.
I can clearly see the penetration was much great at 100% inductance. Good video.
The quencher is awesome.
This video did it for me Paul, I've been trying to find out what inductance is for over a year now. Like you said Google didn't tell me much.
+Richard Valcourt Glad we could help. I think a lot of people know "of" inductance, but really don't know what it does.
wow Paul, what a great description,Paul I miss seeing you on Mig Monday, cheers from Florida, Paul
More wire will result less spater, those factory settings sucks. Anyway great and very informative video. Thanks Paul.
I think it would be very helpful to address WHAT TYPE of welders would get the most use out of this setting!!!!
In my research, it seems this is a feature for guys doing thick walled pipe and thick plate, etc.
Not for Harry Homeowner or some hobby /side hack home shop!
Useless waste of money for them!
A mobile welder business might get some use out of it if he's doing heavy equipment repairs out in the field.
But other wise, default settings are already optimized so.
Unimig has a great article explaining this very topic in an easily digestible way!
Basically, the inductance setting on mig machines is there for guys doing open root passes or fillet joints on thicker metals.
Turning the settings higher gets the puddle to wet out better and with less spatter.
Turning the value down has a faster freezing, less wetting property to the weld.
I can see where this would be handy doing repairs on various earth moving vehicles or pipe line fab work.
Thank you for explaining. The textbook the school mandated was horrible at explaining lol
If you know what you are looking at the video might mean something. I don't and the all looked very similar. Would be nice to say higher inductance cause this to happen to the bead while lower inductance does this to the bead. Does it only change the splatter rate?
Great explanation, thank you!
1:37 "High inductance will allow current to flow very quickly". There is already a current (the arc), and the word current already means flow rate (rate of flow of charge). So this statement was probably intended as "allow current to _increase_ very quickly". But this is exactly backwards. High inductance will _slow_ the rate of increase of current (upon shorting), producing a slower rate of increase of heating (relative to low inductance), and that slower heating rise rate reduces the splatter. www.esabna.com/euweb/mig_handbook/592mig3_6.htm
hello, does inductance have a major influence in smaw?
I'm trying to wrap my head around this concept. I think I will need to perform some welds with different inductance settings on my everlast welder and see what comes of it.
Thanks !
So 100% inductance makes less splatter..will doing this on flux core also make less splatter?
Great explanation! Thanks for your informative video! Your quench system is great too!
Excellent explanation Paul. Thanks, I have a Lincoln Power Mig 210 and wasn't really sure what the inductance setting was for. By the way, I love your quench tank.
Why not leave it at 100% inductance? What is the compromise at 35% where you say most machines are set?
Depending on position of weld. Say running uphill. A more fluid puddle from 100% tends to sag.
I just bought that machine.
Should of saved up and waited for at least the 235
I have seen several dips/ spatter resist for the mig gas cup including petroleum jelly.
WIll you do a comparison.
THanks
Yeah, we can add it to the list and see if we can do a comparison video.
We're you using straight CO2? Or argon mix?
Thanks Paul, can't wait to get my hands on the Rebel machine when it launched in the UK !
He has inductance backwards. Low inductance = current responds fast. High inductance = current responds slower.
Question? If a welder has Stick and MIG, will Inductance function for both welding types, or is it just for MIG?
The Inductance setting will only effect MIG mode. If you demo the machine you will notice that each function has its own parameter setting screen that will effect that process only.
Thank you for the answer. No way to demo, but wish there was.
At zero inductance, when there is no resistance in the circuit, how short circuit does not burn out the windings???
because the current is NOT carried through the wire alone, it's carried by the flexible metal liner and most of the current is transferred to the wire by the contact tip (contact tube) at the end of the welding gun.
There is always some resistance. The mig wire cannot handle the same current load as the power source so it melts.
It does stress the power source more, specially the output diodes, not so much the windings, but remember inverter welders do try to compensate and limit max current. And there surely are differences between good and average electronic designs, mostly you get what you pay for.
Hi Poul, i like your chanel very interesting i whant to ask you if you can do a review for the Esab Rebel in Tig welding, nobody do a review for the Rebel in Tig weld yet.
We just recently filmed one and it will be coming out very soon.
You forgot to mention the heat effected zone. You can clearly see the difference is you look close enough.
What is welding slope
I have been a welder for decades and never have understood that term, Thanks
Really using the toilet to quench? LOL
+Ronald Easley Sometimes you gotta do what you gotta do!
Ron, if the toilet were used for nothing more than quenching then no problem, why not its there to be used for whatever purpose you prefer. However, the tank would be better served for quenching unless the tank style did not permit.........
funny
I think you should buy the Eastwood mp250i much better welder
Your nozzle at 621 good lord scrape it out hehe.
My trainer say always have 100% inductance
Hey I miss this old timer what happened to him?
Is it me or does his welding sound like it's stuttering from too slow a wire speed?
good info tnx, but too much unnecessary talking.
All three of them were too damn cold
Hate the way you guys have your gas bottles in the states get guards on the valves
If I'm trying to weld material on a broken bolt should I have more inductance or less?
Your a lot more friendly then Bob.
Defnotdemas you know I don't give a shit about some give away, right? LOL
Bob doesn't tolerate idiots...
Wtf is happening at 3:30??? 😆😆😆
Quinched, no shit?
He was only quenching so he could keep the settings the same (other than the inductance). Obviously you would not do this on an actual weld!
Quenching in the toilet bowl? That's disgusting.