It looks like you can see the penetration at 3:15

depends....running a higher concentration of argon would only benefit you if your welder is capable of exceeding the transition current for spray transfer...otherwise stick with 75/25 for the best results.

Also interested in the etching of the outside corner joints. An Instagram comparison pic would do.

+Lance Brumfield you could see the penetration on the inside if the corner joint. Pretty good indication all is well

+Steve Williams The first two welds were the outside corner joints. The second two welds were T joints that he etched. Additionally, the etching revealed that the lower feed speed weld had lack of fusion.

+Lance Brumfield I know I'm late but I want to point out that he mentioned in the video that the outside corners don't need as much heat as the inside corners do. He even said why - the outside corners only really present the edges to the heat source, and thus don't conduct the heat away from the weld quite as quicjkly as the big flat areas of the inside corners. So penetration on the outside corners isn't as much an issue as blowing out the puddle might be. Just look at the welds again in the vid and you can clearly see that from their profiles - plus, as mentioned, the back view of the low speed pass does show good penetration right through the root. K Fox

David Ardron i agree.. But some of well expeeienced mig welders told me that back step is not a mig welding process sir.. Is that true? Because they told meback step is lack of fusion.. Backstep technique is what im doing in mig sir..

You could have all the experience in the world & you're still an average to shit welder. Do I what I did long ago, prove them wrong & do a test piece. Polish & etch a cross section with die penetrate & then put it under the press . I generally find those who moan about back step not having penetration are jealous because they never bothered to learn how to do it proficiently themselves in the first place. Keeping in mind back step has to be done hot because your step forward is penetrating the root & the step back is filling the otherwise undercut . This is what you should be primarily focusing on. I guess the key is to not go too fast or too slow, but find that perfect rhythm or balance to get the right look & still have that penetration. but of course if you use low amps you will get a lack of penetration just like laying any weld down with low amps. I've even had co workers in the past asking if the MIG I'm using is a pulse MIG doing back step & they're surprised it isn't, so the sound is something you can focus on also. The back step likewise works a treat doing heavy gauge aluminum, so its really knowing your machine & refining your technique at the end of the day. Once you become proficient at it it becomes second nature & lets not forget a good , well maintained MIG helps you even more.

David Ardron yes sir.. Thank you for your advice..

i bought mine from the james f lincoln website, great books, bought every book they had, like 18 or so total lol

+Jessie Hoffman (IRONCHIPMUNK) jflf.org the james f lincoln foundation

Awesome thanks a bunch, looking for something to read while at Hobart.

Charts for Lincoln 250 argon gas welder

I bought the book recently after having seen your video. While it’s a good book, with a lot of info, it’s from 1954, updated 1962! I wish they had updated it more recently.

+allistairc123 Have you considered moving to the Soviet Union? They have a logical system of measurements and governance that will amuse you greatly.

+therealfranklin hahahahahaha love that

Why the hell would the entire world learn imperial when basically one idiotic country is using it?

Victor E 1st world...yea look up who else uses it really screws up canada

Do you all remember when that probe crashed into Mars? That was because someone messed up and didn't do the conversions from metric to imperial. Personally I'm used to inches and feet and mph but think it is well past time for the entire world to use the same system. The Mars mission cost over 140 million dollars. 140 million dollars shot in the ass because someone didn't do the conversions.

+cr walker While his technique might not agree with your training, Jodie is one of the more knowledgeable "random" welders on the internet giving advice and, more importantly, frequently sharing videos showing the reasoning behind his advice. If you look through his videos, he posted one where he compared push versus pull, and the takeaway is that there is no perceivable difference; I don't remotely remember the whole video, so there may be some exceptions where after 1/4" or something that the technique makes an impact.

Ryan Acre because, much like being left handed, it makes no logical sense to go into the puddle, it's more logical to drag away from the puddle, so that the tip does not make contact

you can push or pull when running short circuit mig like jody was doing in this video, but when you are running higher current such as in the spray arc transfer mode, most of the time you will have better results when you push.

+terry Grubb Because it makes little to no difference to the weld. Jody has a couple of good "push vs. pull" videos here on the channel where he shows the actual weld nugget. If you weren't told which was which you'd never be able to figure it out. They're that similar.

+neon922 Learned that on a million rusty exhausts as a mechanic. How easy it was when I tried it on clean metal comfortably placed on a workbench... As for the pops, keep the flame slightly carburizing (a little acetylene feather visible over the cone) and maybe a one size lager tip to give you a softer flame. The rusty exhausts will pop whatever you do...:/

+neon922 less than ideally clean tip can cause the puddle to blow

I know it's a late response but the puddle popping is usually due to too much heat input

+Nathan Snow ur the one spewing shit. It makes shit all difference, and if anything pulling the gun actually penetrates deeper. He shows many a coupon etched, each with a push and pull and the difference is negligible. I can also create a shit weld by pulling or pushing. Im over this....."you shouldnt guve that advice" shit all because some dickhead told you all mig welds have to be pushed. Don't look at etch or destructive testing or anything though.....